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I'm looking at using dual Xeon E5-2620s on a server build. They support quad channel memory. If I have 4 dimms, will the two processors see it collectively as quad rank, or each processor see a dual rank? I'm also assuming that the processors would be backwards compatible to using dual instead of quad channel?

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What make/model server? –  ewwhite Apr 10 '13 at 16:20
they meaning who/what? Support for quad-channel memory access is really up to the motherboard and it's bus layout. It is up to the chipset(s) to determine how many pipelines are available to access the RAM. The CPU is just a CPU. It computes stuff. It does not determine how the stuff gets in and out of the CPU. –  TheCompWiz Apr 10 '13 at 16:32
Look at your motherboards manual. It will almost certainly insist that you put the memory in specific banks, probably two per CPU (and using up to dual channel). The alternative would be one CPU with quad rank memory and one with no own memory (and thus very slow accessing it all indirectly via the memory controllers on the other CPU. And that is if it works at all, which I doubt. But as TheCompWiz wrote, that it up to the motherboards manufacturer. So check the manual. –  Hennes Apr 10 '13 at 16:44
It's a dell t620 server, so they would be building it. So for the exact motherboard and chipsets, I don't know. I feel like my question has been answered, that yes it will run in dual channel and not quad, as long as they set it up proper. If any of you want to put that as an actual answer, i'll mark it answered. Thanks! –  dave k Apr 10 '13 at 17:28

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