Unsure how many QPI links my CPUs have

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hextane

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Feb 23, 2015
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Hi,

Bought a pair of Xeon QA8Es to go in an Asus Z9PE-D8 WS Motherboard. The System will boot up fine but I can only see one processor installed in both OS and BIOS. I've tried swapping the CPUs around but still get the same outcome.

I've tried googling but can't find any information about how many QPI links these processors have. They're a variation of the Xeon E5-2665, so did I wrongly assume that these would have two QPI links by default?

I posted this to the Motherboard section of the Forum but it hasn't gotten me anywhere, so I'm thinking maybe it's a CPU problem.








 
Solution
Someone Somewhere
It looks like it's a pre-production/Engineering Sample CPU. I can't find its exact specs, because Intel doesn't release them.

Intel makes CPUs, cut from the same die (I believe) with the ability to run in single, double, or quad socket systems. Just because it's a 'variant' of a 2665 doesn't necessarily mean that it's got the same bits enabled.

I suspect these are single-socket CPUs.
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Someone Somewhere

Someone Somewhere

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Sep 23, 2012
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It looks like it's a pre-production/Engineering Sample CPU. I can't find its exact specs, because Intel doesn't release them.

Intel makes CPUs, cut from the same die (I believe) with the ability to run in single, double, or quad socket systems. Just because it's a 'variant' of a 2665 doesn't necessarily mean that it's got the same bits enabled.

I suspect these are single-socket CPUs.
 
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Solution
P

Pinhedd

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Aug 7, 2007
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That CPU should have two QPI links on the die, but one of them will be disabled as it's only dual-socket capable.

EDIT: As SS said, if it's an ES chip it may be limited to a single-socket with both QPI links disabled
 
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hextane

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Feb 23, 2015
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This seems like the best answer. Even though the CPUs do not have two QPI links, surely the BIOS would detect the second CPU socket as being populated? All I see is a blank space under "CPU2" in the BIOS settings.

 
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Pinhedd

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Aug 7, 2007
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If there's no QPI links then there's no way for the CPU in the first socket to communicate with the second socket.

I suppose that there may be some sort of insertion signal which is pulled low when a CPU is inserted into the socket that could be probed, but this probably wouldn't provide sufficient information to determine the characteristics of the CPU.
 
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hextane

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Feb 23, 2015
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Thanks for the info, greatly appreciated!
 
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