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I want to set-up a machine using 2 Intel Xeon E5-2620 CPUs and 2 16GB DIMMs.

I am now told that for both CPUs to function, I need at least 2 pairs of identical DIMMs (4 DIMMs total).

Is that true? Is the only solution that I buy 2 more memory DIMMs?

Update:

The manuals for the CPUs don't mention RAM. The hardware are 2 Intel Xeon E5-2620, 2 EDGE Memory 16GB (1x16GB) ECC DRX4 DDR3 PC3L10600 DIMMs (647901-B21-PE). The motherboard is a SuperMicro X9DR7-LN4F.

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closed as too localized by BBlake, Canadian Luke, Renan, 8088, MaQleod Oct 12 '12 at 21:02

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Its not possible for your motherboard to support 512GB of memory if the highest capacity it supports is 32GB. The most it can support is 4*32GB or 128GB. What exactly is the qustion? The motherboard manual answers this question. I am voting to close since this is to localized, and even if its not localized, its vague and shows a complete lack of research. –  Ramhound Oct 12 '12 at 19:04
    
That number was taken from the manufacturer's product page here. This isn't about the motherboards. It's about the CPUs. Do the CPUs need 2 pairs of DIMMs to function (since I now have only 1 pair)? I couldn't find any resources that specifically mention the RAM configuration supported by the CPU. –  Jason Tzen Oct 12 '12 at 19:07
    
The manual does not clearly states that you must install at least 4 DIMMs to make your motherboard working. However, the motherboard block diagram shows that each CPU is interfaced to it's own set of DIMM slots and the table states that for optimal performance you need to install at least 4 DIMMs. So, it might be working with 2 DIMMs but this is not a must. You can try of course, but the performance will be much different. –  Serge Oct 12 '12 at 19:36
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@ Ramhound The MB has 16 DIMM slots according to the maual I found. Agree OP did little research –  Dave M Oct 12 '12 at 19:56

2 Answers 2

up vote 1 down vote accepted

With this motherboard, each processor needs to have its own memory to operate.

From what I read in the manual on page 2-9, the table indicates the minimum memory for a 2 CPU installation there needs to be two pair of memory modules (one pair per CPU) and it shows which slots they need to be in.

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In other words, this is clearly a constraint of the motherboard, not the cpu, and yes, you do need 4 chips (2 pairs). –  Joel Coehoorn Oct 12 '12 at 20:05

Most manuals will have specific instructions for installing RAM. What does the manual say? If you have additional info on the exact hardware, a better answer will be possible.

Given that the manual shows clearly that each CPU has independant RAM, you will need to add RAM in each bank for each processor. Section 2-8 of the manual shows optimal config

Note that the motherboard chipset and not the CPU will often dictate RAM install config

SuperMicro Download

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Question updated. –  Jason Tzen Oct 12 '12 at 18:56
    
Motherboard make and model? –  Dave M Oct 12 '12 at 19:01
    
SuperMicro X9DR7-LN4F. –  Jason Tzen Oct 12 '12 at 19:02

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