Supplier Eff up. Mixed CPU's

Posted on 2011-10-24
Last Modified: 2012-05-12
It has been 2 years since we noticed it after checking some invoices (for other things), we have had 2 Server 2008 R2 RDP servers playing up on & off for years. It may be related but maybe not.

We have 2x HP BL460c's in our chassis and the supplier mucked it up and put in CPU #2 as a lower spec'd CPU (see url:,33079 - both CPU's are listed)

Would the fact that 1 CPU does not have Idle States, Speed Step & Demand Based Switching whereas the other does? From memory the Speed Step options are set in the BIOS also..

We also have another server - a BL480c with an E5430 & E5410 but it runs fine - Bar showing that they are listed at 2.66GHz but are stuck running at 2.33GHz.
Question by:kiwistag
    LVL 55

    Expert Comment

    You're certainly gambling since mixed CPUs aren't supported, I'd swap CPUs about so you have one dual E5410 machine and one dual 5430 one. It's quite possible that something like a BIOS update would completely stop it working, for example with new BIOS it may detect the misconfigurastion and disable itself.
    LVL 6

    Author Comment

    The 5430/5410 one works fine (bl480c).
    The bl460c's each have the 5410's & 5405's. Yes I'd agree that it could be a problem.
    For anyone else do you have any input to back it up? Need some evidence to pass on due to the prolonged inconsistent (and sometimes rare) issues at hand.
    LVL 55

    Accepted Solution

    by: may count as evidence -

    "When mixing processors containing different processor speeds, cache sizes, number of cores, or rated maximum power consumption, server instability may occur on ProLiant 300/400/500-series multi-processor socket servers configured with Intel Xeon processors or AMD Opteron processors. The server may function with certain mixed processor configurations; however, the configurations previously stated are unsupported and have not been validated. "
    LVL 69

    Expert Comment

    This article is somewhat old, but it is still true regarding use of multiple socket cpus on a platform:  

    "Intel supports mixing processor steppings and does not actively prevent various steppings of the Pentium II Xeon processor from working together in multiprocessor systems. However, since Intel cannot test every possible combination of devices, each new stepping of a device is fully tested only against the latest steppings of other processors and chipset components."

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