DIMMs: Single vs. Double vs. Quad Rank

Posted by MikeyB on Server Fault See other posts from Server Fault or by MikeyB
Published on 2009-09-29T14:04:35Z Indexed on 2010/03/17 16:41 UTC
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memory

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Hardware

What difference does the 'Rank' of DIMMs make to server memory? For example, when looking at server configurations I see the following being offered for the same server:

2GB (1x2GB) Single Rank PC3-10600 CL9 ECC DDR3-1333 VLP RDIMM

2GB (1x2GB) Dual Rank PC3-10600 CL9 ECC DDR3-1333 VLP RDIMM

Given the option of Single Rank vs. Dual Rank or Dual Rank vs. Quad Rank is one always:

Faster?
Cheaper?
Higher Bandwidth?

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