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• How have your coding values changed since graduating?

  - by Matt

  We all walked out of school with the stars in our eyes and little experience in "real-world" programming. How have your opinions on programming as a craft changed since you've gained more experience away from academia? I've become more and more about design a la McConnell : wide use of encapsulation, quality code that gives you warm fuzzy feelings when you read it, maintainability over execution performance, etc..., whereas many of my co-workers have followed a different path of fewer middlemen layers getting in the way, code that is right out in the open and easier to locate, even if harder to read, and performance-centric designs. What have you learned about the craft of software design which has changed the way you approach coding since leaving the academic world?

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• How should I structure my iPhone OpenGL ES 1.1 game?

  - by Ryan

  I am building an iPhone OpenGL ES 1.1 game. I am using the OpenGL ES template provided by xcode. I am only using the ES1Renderer. I've coded some basic touch actions the user can take, and I've begun to think about the overall structure of the code. All I'm really doing is using C in the ES1Renderer.m for my entire game state. I have an array of bullet structs, an array on enemy structs, etc.. Besides using this structure, where my entire game state is in ES1Renderer.m as C arrays and structs, what other ways are there to structure the code? Should I be using C++ or Objective-C classes to represent the enemies so they are more modular? The main reason I ask this is because I don't normally code in C, C++ and Objective-C..so I am a little fuzzy on coming up with a good architecture here.

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• Hibernate entities stored as HttpSession attribute values

  - by njudge

  I'm dealing with a legacy Java application with a large, fairly messy codebase. There's a fairly standard 'User' object that gets stored in the HttpSession between requests, so the servlets do stuff like this at the top: HttpSession session = request.getSession(true); User user = (User)session.getAttribute("User"); The old user authentication layer (which I won't describe; suffice to say, it did not use a database) is being replaced with code mapped to the DB with Hibernate. So 'User' is now a Hibernate entity. My understanding of Hibernate object life cycles is a little fuzzy, but it seems like storing 'User' in the HttpSession now becomes a problem, because it will be retrieved in a different transaction during the next request. What is the right thing to be doing here? Can I just use the Hibernate Session object's update() method to reattach the User instance the next time around? Do I need to?

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• Maintaining Logging and/or stdout/stderr in Python Daemon

  - by dave mankoff

  Every recipe that I've found for creating a daemon process in Python involves forking twice (for Unix) and then closing all open file descriptors. (See http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/ for an example). This is all simple enough but I seem to have an issue. On the production machine that I am setting up, my daemon is aborting - silently since all open file descriptors were closed. I am having a tricky time debugging the issue currently and am wondering what the proper way to catch and log these errors are. What is the right way to setup logging such that it continues to work after daemonizing? Do I just call logging.basicConfig() a second time after daemonizing? What's the right way to capture stdout and stderr? I am fuzzy on the details of why all the files are closed. Ideally, my main code could just call daemon_start(pid_file) and logging would continue to work.

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• Choose Your Own Adventure : BASIC Programming

  - by theraccoonbear

  Hopefully this isn't considered too off-topic, but I guess we'll see. I'd love to find and frame a copy of this book. Years ago, in my pre-teen years, I remember reading a lot of CYOA books, and one in particular stands out in my mind as the book that started me down the path of becoming a programmer. The details are fuzzy, but what I remember was that the story involved a programmer who was held captive somewhere and was trying to escape. IIRC, each section or chapter had a short BASIC program you could could type into your computer to simulate something from the story. The one that stands out most in my mind was a very simplistic animation made with pipes, pluses, and dashes that "looked" like a metal grate that opened (sliding upward). I realize this is pretty scant information to go on, but I suspect that anyone else who read the book would immediately remember it. Maybe not, I guess we'll see. Again, my apologies if this is too far off-topic for S.O.

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• fmod getWaveData() export to WAVE file help (C++)

  - by eddietree

  I am trying to export the current sound that is being played by the FMOD::System into a WAVE file by calling getWaveData(). I have the header of the wave file correct, and currently trying to write to the wave file each frame like so: const unsigned int samplesPerSec = 48000; const unsigned int fps = 60; const int numSamples = samplesPerSec / fps; float data[2][numSamples]; short conversion[numSamples*2]; m_fmodsys->getWaveData( &data[0][0], numSamples, 0 ); // left channel m_fmodsys->getWaveData( &data[1][0], numSamples, 1 ); // right channel int littleEndian = IsLittleEndian(); for ( int i = 0; i < numSamples; ++i ) { // left channel float coeff_left = data[0][i]; short val_left = (short)(coeff_left * 0x7FFF); // right channel float coeff_right = data[1][i]; short val_right = (short)(coeff_right * 0x7FFF); // handle endianness if ( !littleEndian ) { val_left = ((val_left & 0xff) << 8) | (val_left >> 8); val_right = ((val_right & 0xff) << 8) | (val_right >> 8); } conversion[i*2+0] = val_left; conversion[i*2+1] = val_right; } fwrite((void*)&conversion[0], sizeof(conversion[0]), numSamples*2, m_fh); m_dataLength += sizeof(conversion); Currently, the timing of the sound is correct, but the sample seems clipped way harshly. More specifically, I am outputting four beats in time. When I playback the wave-file, the beats timing is correct but it just sounds way fuzzy and clipped. Am I doing something wrong with my calculation? I am exporting in 16-bits, two channels. Thanks in advance! :) Reference (WAVE file format): http://www.sonicspot.com/guide/wavefiles.html

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• cloud programming for OpenStack in C / C++

  - by Basile Starynkevitch

  (Sorry for such a fuzzy question, I am very newbie to cloud programming) I am interested in designing (and developing) a (free software) program in C or C++ (probably, most of it being meta-programmed, i.e. part of the C code code being generated). I am still in the thinking / designing phase. And I might perhaps give up. For reference, I am the main architect and implementor of GCC MELT, a domain specific language to extend the GCC compiler (the MELT language is translated to C/C++ and is bootstrapped: the MELT to C/C++ translator being written in MELT). And I am dreaming of extending it with some cloud computing abilities. But I am a newbie in cloud computing. (I am only interested in free-software, GPLv3 friendly, based cloud computing, which probably means openstack). I believe that "compiling on the cloud with some enhanced GCC" could make sense (for super-optimizations or static analysis of e.g. an entire Linux distribution, or at least a massive GCC compiled free software like Qt, GCC itself, or the Linux kernel). I'm dreaming of a MELT specific monitoring program which would store, communicate, and and enhance GCC compilation (extended by MELT). So the picture would be that each GCC process (actually the cc1 or cc1plus started by the gcc driver, suitably extended by some MELT extension) would communicate with some monitor. That "monitoring/persisting" program would run "on the cloud" (and probably manage some information produced by GCC e.g. on NoSQL bases). So, how should some (yet to be written) C program (some Linux daemon) be designed to be cloud-friendly? So far, I understood that it should provide some Web service, probably thru a RESTful service, so should use an HTTP server library like onion. And that OpenStack is able to start (e.g. a dozen of) such services. But I don't have a clear picture of what OpenStack brings. So far, I noticed the ability to manage (and distribute) virtual machines (with some Python API). It is less clear how can it distribute some ELF executable, how can it start it, etc. Do you have any references or examples of C / C++ programming on the cloud? How should a "cloud-friendly" (actually, OpenStack friendly) C/C++ server application be designed?

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• What economic books would you suggest for learning about economic valuation of goods and simulations thereof?

  - by Rushyo

  I'm looking to create an economic model for a game based on goods created procedurally. Every natural resource and produced good would be procedurally generated, with certain goods being assigned certain uses. Fakesium might be used for the production of Weapon A and produced from Fakesium factories which use Dilithium and Widgets as reagents, where Widgets are also the product of Foo and Bar The problem is not creating the resources and their various production utlities - but getting the game's AI empires and merchants to (Addendum: somewhat) correctly value the goods according to their scarcity, utility and production costs. I need to create a simulation of goods which allows the various game factions to assign a common value denominator (credits) to each resource, depending on how much its worth to that empire. I see the simulation being something like: "I have a high requirement for Weapon A. Since I don't have much of Fakesium, which is needed for Weapon A - I must have a high demand for Fakesium. If I can acquire Fakesium, devalue it. If not, increase its value - and also increase demand for Dilithium and Widgets too." This is very naive - because it may be much much cheaper for the empire to simply purchase Dilithium and Widgets directly rather than purchasing Fakesium, for example. Another example is two resources might allow the creation of Weapon A (Fakesium and Lieron), so we'd need to consider that. I've been scratching my head over the problem and it keeps growing. By the time the player joins the world, I'd expect enough iterations of this process to have occurred that prices would have largely normalised - and would then only trigger rarely to compensate for major changes (eg. if the player blows up the world's only Foo mine!) Could anyone suggest resources (books, largely) which outline this style of modelling, preferably in the context of simulations? Since this problem would never occur outside fantasy worlds, I figured this is probably the most likely place to find people who have encountered similar problems and I'm sure there's people who know of good places for Games Developers to start looking at less specific economic theory too. Additionally, does anyone know of any developers with blogs whose games or research applications perform similar modelling? EDIT: I think I should underline that I'm not looking for optimal solutions. I'm looking to make the actors impulsive - making rudimentary decisions based on fuzzy inputs about what they care about or don't. I'm aiming to understand the problem area better not derive answers. All the textbooks I've found seem to be about real-world economics or how to solve complex theoretical problems, neither of which are terribly relevant to the actor's decision making.

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• Strategy for avoiding duplicate object ids for data shared across devices using iCloud

  - by rmaddy

  I have a data intensive iOS app that is not using CoreData nor does it support iCloud synching (yet). All of my objects are created with unique keys. I use a simple long long initialized with the current time. Then as I need a new key I increment the value by 1. This has all worked well for a few years with the app running isolated on a single device. Now I want to add support for automatic data sync across devices using iCloud. As my app is written, there is the possibility that two objects created on two different devices could end up with the same key. I need to avoid this possibility. I'm looking for ideas for solving this issue. I have a few requirements that the solution must meet: 1) The key needs to remain a single integral data type. Converting all existing keys to a compound key or to a string or other type would affect the entire code base and likely result in more bugs than it's worth. 2) The solution can't depend on an Internet connection. A user must be able to run the app and add data even with no Internet connection. The data should still resolve properly later when the data syncs through iCloud once a connection is available. I'll accept one exception to this rule. If no other option is available, I may be open to requiring an Internet connection the first time the app's data is initialized. One idea I have been toying around with in my head is logically splitting the integer key into two parts. The high 4 or 5 bits could be used as some sort of device id while the rest represents the actual key. The fuzzy part is figuring out how to come up with non-conflicting device ids that fit in a few bits. This should be viable since I don't need to deal will millions of devices. I just need to deal with the few devices that would be shared by a given iCloud account. I'm open to suggestions. Thanks.

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• Adobe Illustrator can't open SVG file

  - by themapguyde

  I have a generated SVG file which for some reason won't open in Adobe Illustrator when I serve the file content from my ASP.net application, but if I were to write this generated file directly to the file system from my ASP.net application, the file opens fine! I've put a zip of the two files here: http://dl.dropbox.com/u/1761973/Files.zip The zip has two files: Map.svg Test.svg Map.svg doesn't open in Illustrator, it shows up a Text Import Options dialog, and upon clicking OK, will show the XML content of the file. Test.svg opens fine in Illustrator. Doing a comparison of the two files yields NO DIFFERENCES whatsoever! There must be something different in these two files (caused by downloading the generated SVG from the web browser), but I have no idea what?

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• Play Halo on the Xbox360 Arcade

  - by Jeremy Rudd

  I'm looking at purchasing a Xbox360 because I've wanted to catch up with the Halo trilogy. Does the cheap Arcade edition console support Halo 2 Halo 3? Halo Wars? Would I be able to save my game progress in single player? Would I be able to play online in typical maps? General questions: Would I be able to play games using the DVD drive or do I have to download everything? Does the tiny HDD hurt even if I don't download any games, trailers or music? Are there any other differences in comparison to the Xbox360 Pro? I have a regular TV that uses the composite cable, so I don't need the HDTV support in the Pro edition.

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• Opinions on NTFS for Mac solution?

  - by AngryHacker

  I am currently using the free NTFS-3G to access my NTFS drive from the Mac. It seems pretty stable (except once in the very beginning, it locked up the Mac and corrupted my NTFS drive, which I then fixed with chkdsk from a PC). However, speed is NOT one of its virtues. In fact, it's painfully slow I've been looking at buying Paragon NTFS for Mac OS X 8.0. Their product comparison PDF claims nearly double the speed (vs NTFS-3G) in almost every category (read, write, etc...). In addition, there is now an unsupported native solution with the snow leopard. Can folks here share their experiences. Is the native solution stable enough to be used for daily work? Should I just go with Paragon?

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• Slow network file access with VMWare Server and Windows 7

  - by garethm

  I have Windows 7 32-bit virtual machine running in a VMWare Server virtual machine. The host is Windows 7 64-bit. When I copy files between them it is extremely slow - it will take several minutes to copy even a 1 MB file. I can upload the file to an website and then download it again almost instantaneously by comparison. Browsing the network is quite zippy and has no problems. I have been unable to set up a HomeGroup between the computers though - the guest always times out without managing to get setup. Any ideas on how I should go about tracking down where the problem is?

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• Reverse DNS does not match SMTP banner vs Reverse DNS mismatch

  - by MadBoy

  I have to make decision whether my Reverse DNS should match SMTP banner but Reverse DNS to DNS and vice versa stays different or vice versa. Which one to choose? I have an 2x Exchange 2010 server with one SMTP Sender with TMG 2010. TMG has 2 links connected so that we have 2 separate internet providers. The problem is I have no way to control TMG behavior on which link is used to send emails as it picks it randomly. I have 2 MX records: - mail.test.com which resolves to IP and IP resolves to mail.test.com - mail2.test.com which resolves to IP2 and IP2 resolves to mail.test.com This was done to prevent smtp banner issues but it provides problems with Reverse DNS if the server on the other side is eager enough to do comparison. But I've checked with Google and they also don't have that in perfect condition.

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• Incredibly high latency for Ubuntu guest on Hyper-V

  - by Mark Henderson

  I've got several Ubuntu 10.04 virtual machines running as Hyper-V guests on Windows Server 2008 R2 SP1 and they're all perfectly fine. Today I installed my first Ubuntu 11.10 virtual machine and I'm seeing rediculous pings: These servers are all connected via gigabit to a local LAN, with almost no network traffic at all1, with a legacy network adapter in Hyper-V. I'm a bit of an Ubuntu n00b so I don't really know where to go from here. Any ideas? free -m reports: total used free shared buffers cached Mem: 485 470 15 0 63 299 -/+ buffers/cache: 107 378 Swap: 507 20 487 This is within a few mb of our other Ubuntu servers that are on 10.04. I removed the Legacy NIC and installed a Synthetic one in Hyper-V and this did improve the numbers, in that they're around 10-30ms now, but I would still be expecting <1ms response times. 1As a comparison, I have another Ubuntu 10.04 guest on Hyper-V almost 1,000km away that has a ping of 33ms

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• Is there a diff utility that allows you to exclude columns?

  - by user39160

  For example, I have a text file, each line is a long string. I want to exclude 2 "segments" of this string, say columns 1-7 and 20-22. So the bottom 2 lines below would be a match: 123456789012345678901234567890 ------------------------------ xxxxxxxAAAAAAAAAAAAxxxBBBBBBBB yyyyyyyAAAAAAAAAAAAyyyBBBBBBBB I know WinMerge has a "IgnoreColumns" plugin but I have never go this working. In this example I would rename it IgnoreColumns_1-7, 20-22.dll, select it in the plugins menu, and choose "Pre-Differ." but it has never worked. I am going to be comparing huge files that I don't want to modify. I'm not opposed to stream editing them in the comparison with sed or something like that, but I would prefer not to modify the actual files. I have not chose to feed sed to diff yet just because I was hoping for for a more visual view of the data.

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• BES 5.0 and MAPI calls to exchange system

  - by nysingh

  We have been using BES 4.1(5) for a while now and it has been a resource hog on exchange due to high number of MAPI calls. I have heard that BES 5.0 is even worse. the comparison i heard is that BES 4.1 is makes MAPI calls equal to 5 outlook clients per BB user and BES 5.0 makes MAPI calls equal to 10 outlook clients per BB user. can someone confirm if it is true? is BES 5.0 is really that bad in MAPI calls and for exchange performance. ? thanks

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• If Nvidia Shield can stream a game via WiFi (~150-300Mbps), where is the 1-10Gbps wired streaming?

  - by Enigma

  Facts: It is surprising and uncharacteristic that a wireless game streaming solution is the *first to hit the market when a 1000mbps+ Ethernet connection would accomplish the same feat with roughly 6x the available bandwidth. 150-300mbps WiFi is in no way superior to a 1000mbps+ LAN connection aside from well wireless mobility. Throughout time, (since the internet was created) wired services have **always come first yet in this particular case, the opposite seems to be true. We had wired internet first, wired audio streaming, and wired video streaming all before their wireless counterparts. Why? Largely because the wireless bandwidth was and is inferior. Even today despite being significantly better and capable of a lot more, it is still inferior to a wired connection. Situation: Chief among these is that NVIDIA’s Shield handheld game console will be getting a microconsole-like mode, dubbed “Shield Console Mode”, that will allow the handheld to be converted into a more traditional TV-connected console. In console mode Shield can be controlled with a Bluetooth controller, and in accordance with the higher resolution of TVs will accept 1080p game streaming from a suitably equipped PC, versus 720p in handheld mode. With that said 1080p streaming will require additional bandwidth, and while 720p can be done over WiFi NVIDIA will be requiring a hardline GigE connection for 1080p streaming (note that Shield doesn’t have Ethernet, so this is presumably being done over USB). Streaming aside, in console mode Shield will also support its traditional local gaming/application functionality. - http://www.anandtech.com/show/7435/nvidia-consolidates-game-streaming-tech-under-gamestream-brand-announces-shield-console-mode ^ This is not acceptable to me for a number of reasons not to mention the ridiculousness of having a little screen+controller unit sitting there while using a secondary controller and screen instead. That kind of redundant absurdity exemplifies how wrong of a solution that is. They need a second product for this solution without the screen or controller for it to make sense... at which point your just buying a little computer that does what most other larger computers do better. While this secondary project will provide a wired connection, it still shouldn't be necessary to purchase a Shield to have this benefit. Not only this but Intel's WiDi claims game streaming support as well - wirelessly. Where is the wired streaming? All that is required, by my understanding, is the ability to decode H.264 video compression and transmit control/feedback so by any logical comparison, one (Nvidia especially) should have no difficulty in creating an application for PC's (win32/64 environment) that does the exact same thing their android app does. I have 2 video cards capable of streaming (encoding) H.264 so by right they must be capable of decoding it I would think. I should be able to stream to my second desktop or my laptop both of which by hardware comparison are superior to the Shield. I haven't found anything stating plans to allow non-shield owners to do this. Can a third party create this software or does it hinge on some limitation that only Nvidia can overcome? Reiteration of questions: Is there a technical reason (non marketing) for why Nvidia opted to bottleneck the streaming service with a wireless connection limiting the resolution to 720p and introducing intermittent video choppiness when on a wired connection one could achieve, presumably, 1080p with significantly less or zero choppiness? Is there anything limiting developers from creating a PC/Desktop application emulating the same H.264 decoding functionality that circumvents the need to get an Nvidia Shield altogether? (It is not a matter of being too cheap to support Nvidia - I have many Nvidia cards that aren't being used. One should not have to purchase specialty hardware when = hardware already exists) Same questions go for Intel Widi also. I am just utterly perplexed that there are wireless live streaming solution and yet no wired. How on earth can wireless be the goto transmission medium? Is there another solution that takes advantage of H.264 video compression allowing live streaming over a wired connection? (*) - Perhaps this isn't the first but afaik it is the first complete package. (**) - I cant back that up with hard evidence/links but someone probably could. Edit: Maybe this will be the solution I am looking for but I still find it hard to believe that they would be the first and after wireless solutions already exist. In-home Streaming You can play all your Windows and Mac games on your SteamOS machine, too. Just turn on your existing computer and run Steam as you always have - then your SteamOS machine can stream those games over your home network straight to your TV! - http://store.steampowered.com/livingroom/SteamOS/

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• Windows Batch Scripting: Newest File Matching a Pattern

  - by Eddie Parker

  This would be lightning quick in linux, but I'm not familiar enough with windows flavour of batch scripting. Basically I want to look for a series of files matching a certain wildcard, and get the one with the most recent modified date. I've gotten as far as: for %%X in (*.exe) do ( REM Do stuff.... ) But I'm not sure what manner of comparison operators there are, or if there's a better way of doing this. Anyone offer up any good solutions? Ideally it would involve a vanilla install of Vista; so no special trickery like cygwin/etc.

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• Would Microsoft Security Essentials be adequate protection?

  - by Xavierjazz

  Is Microsoft Security Essentials (MSE) adequate protection for my computer? What is the experience with this product? EDIT. On 2009-10-31 I found out about a comparison of AV Suites. MSE did VERY well. EDIT: One that I found interesting was "Raven", who mentioned that AV software has to hook deeply into the OS, and who better to design this than the designer of the OS. EDIT: My personal experience is that I like it, but I also use Malwarebytes and Superantispyware. Each of them sometimes come up with one the others missed or ignored.

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• Hyper-V core NIC speeds and registry changes

  - by gary

  Good afternoon, On a Dell PE T610 I have Hyper-V core running, with 2 x Broadcom BCM5709C NetXtreme II GigE installed. I have noticed that copying large files 17GB for example, from a network physical server to the Hyper-V host local drive [not vm guest] is very slow in comparison to copying from Physical to Physical servers. Copying a 17GB file physical to Hyper-V host takes 30 minutes Copying a 17GB file physical to physical host takes 15 minutes Can someone tell me exactly what registry nodes I should disable on Hyper-V NICs to improve performance. So far I have gone to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class{4 D36E972-E325-11CE-BFC1-08002BE10318} and set the following to 0 on both physical NICs: *LSOv1IPv4 *LSOv2IPv6 *TCPUDPChecksumOffloadIPv4 *TCPUDPChecksumOffloadIPv6 Should I also disable *TCPConnectionOffloadIPv4 & *TCPConnectionOffloadIPv6? Many thanks in advance

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• Intel Xeon vt-d query

  - by deploymonkey

  Does Xeon westmere ep (xeon 56xx series) have vt-d (=iommy / direct io) or does intel TXT (Intel® Trusted Execution Technology) include vt-d? I'm at a loss. I've been researching current processors for an important project for some time now. I need to know, if the xeon 5600s (Westmere EP) include vt-d (iommu/directed io/pci passing) because the system will run virtualized guests. This enables direct hardware access eg. pci passthrough, in xen for example. It seems that the 5600s TXT should incorporate vt-d and that xeon 5600s should include vt-d as they are ramped up 5500s, but there is no conclusive answer anywhere. Intel's processor comparison only states that 5500s have vt-d and no TXT and 5600s have no vt-d but TXT. I'd be really grateful if anybody could clear this up and possibly even provide a citation. Thanks a lot.

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• OpenX : mySql VS PostgreSQL

  - by Andreas Grech

  I have been using OpenX's AdServer with mySql as a backend, and since OpenX allows one to choose between mysql and postgres, I was wondering if anyone ever used Postgres and wished to talk about their experience with it here. Also, is there anyone who maybe tried using OpenX with both and can offer a comparison between the databases ? I am asking this question because I was having some trouble recently with mySql because some tables crashed occasionally and proved problematic because of the overhead they generated; and as a consequence of this, Statistics where not being generated.

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• Fourier transform software

  - by CFP

  Hello everyone! After spending a lot of time searching for this, I thought that some SuperUser gurus might know the answer :) I'm searching for an open source application to compute an FFT, that could: * Import a list of points from a text file (in any format, I could write conversion scripts if needed), for example 0,1; 1,2; 4,5 * Compute the associated discrete transform, and output the list of coefficients Ideally, it would also display the plot and the associated fourier decomposition on the same graph, to allow comparison, but this is not absolutely needed. It can be either on Windows or on Linux/Unix. Can you think of a solution? Thanks, CFP.

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• What are the performance differences between PCI-Express x16 and x4

  - by Cestarian

  I have two PCI-Express 2.0 x16 slots on my motherboard, but one of them is actually just x4. For passing through my graphics card to a virtual machine I need to use both slots simultaneously and unfortunately, the easiest way for me to achieve that is putting the stronger card in the x4 slot (secondary slot; I need the stronger card to be in the secondary slot, not the primary). As such I am wondering what sort of noticable performance differences I can expect from using the x4 slot with a strong card as opposed to having it in the true x16 slot. Does it limit the performance so much that the strong card in the x4 slot will actually perform worse than the significantly weaker card in the x16 slot? (For spec comparison I am using a GTX-670 in the x4 slot and GTX-550-Ti in the x16 slot) What implications does this have?

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