I currently have a 120Gib SSD which is pretty fast for things like game loading times and video editing.

However, I was wondering about getting another identical drive and hooking it up with a striping RAID array in hardware (I boot multiple operating systems).

This would have the dual benefits of providing a larger logical drive, while also providing greater performance.

However, I have a few questions:

1. What kind of performance increase can I expect to see with a pair of good quality SSDs?
2. How expensive is a quality desktop RAID controller?
3. Will the controller present the OS with a single logical drive? Does this mean I can still partition it and multi-boot? Basically, can I treat the RAID controller as "a hard drive" at the OS level?