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I want to build a very parallel (at least 24 cores) AMD opteron (bulldozer) system.

I'm looking at some motherboards and I can't figure out if they're UMA or NUMA (uniform memory access vs non-uniform memory access.)

Are most multi-socket motherboards one or the other architecture?

Here are two I was looking at:

Quad socket Tyan: http://www.newegg.com/Product/Product.aspx?Item=N82E16813151219

Dual socket Asus: http://www.newegg.com/Product/Product.aspx?Item=N82E16813131643&Tpk=KGPR-D16

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This is not off-topic according to the faqs... Does someone want to explain why this question is not appropriate here? – Eloff Jan 23 '12 at 17:36
The way I understand it, questions about servers by professionals for professional use are the exact domain of this website. – Eloff Jan 23 '12 at 20:27

closed as off topic by SvW, Bill Weiss, Ward, Khaled, MDMarra Jan 23 '12 at 14:21

Questions on Server Fault are expected to relate to professional server, networking, or related infrastructure administration within the scope defined in the FAQ. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about closed questions here.

1 Answer

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As far as I know, all AMD-headed stuff is NUMA. The "clue" you're asking for is checking the memory configuration - if some of the available memory banks are only usable if the second/third/forth CPU socket(s) are populated, you probably have a NUMA architecture.

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