Single rank vs. dual rank DIMM question

[chuckk281]

Marc had a memory question:

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Two 4G kits are available for ProLiant 300 : 4GB Single Rank and 4GB dual Rack, they seems to be at same price, what are advantages disadvantages to select 1R versus 2R ?

• HP 4GB (1x4GB) Dual Rank x4 PC3-10600 (DDR3-1333) Registered CAS-9 Memory Kit                   500658-B21
• HP 4GB (1x4GB) Single Rank x4 PC3-10600 (DDR3-1333) Registered CAS-9 Memory Kit 593339-B21

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Eirik provided some info:

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Look at these documents. They provide a good explanation.

http://en.wikipedia.org/wiki/DIMM#Ranking

http://www.moynetworks.com/knowledgebase/SinglevsDualRAM.pdf

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I hope they help you. Any comments or questions?