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Basically on a motherboard like H8DME-2, can you use all memory sockets if you have only 1 CPU installed? Or are each memory "section" per CPU? (not sure what they are called)

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up vote 6 down vote accepted

From supermicro's page for that model

For Single CPU: Memory must be populated in CPU1 DIMMs only

For Dual CPUs: Recommended that memory be populated equally in adjacent memory banks

I do believe modern processors have their memory controllers on die, so this makes a lot of sense. Even if it didn't, it would be a lot more complicated to share ram between processors rather than to have each processor handle its own ram. I believe the necessity to have the same amount of ram per processor is because the system uses SMP without a shared system bus (the alternative being NUMA, which opterons support).

The articles on wikipedia on SMP and NUMA might be enlightening here, if you're interested in the details.

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Thanks alot. ... – Joan Venge Oct 12 '13 at 0:45

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