Adding a second Quad Core L5420 CPU to a 1950 III

PJF sec-alert at socalweb.com
Wed Mar 3 13:51:36 CST 2010


> -----Original Message-----
> From: linux-poweredge-bounces at dell.com [mailto:linux-poweredge-
> bounces at dell.com] On Behalf Of Tim Small
> Sent: Wednesday, March 03, 2010 10:18 AM
> To: linux-poweredge at lists.us.dell.com
> Subject: Re: Adding a second Quad Core L5420 CPU to a 1950 III
> 
> PJF wrote:
> > I've been through the dell docs and intel docs, not sure if the
> stepping
> > matters.
> >
> 
> 
> Out of curiosity I had another look at this.  Intel's line on older
> processor lines were that the steppings shouldn't differ by more than
> 1,
> Intel's 5400 series datasheet says:
> 
> http://www.intel.com/Assets/en_US/PDF/datasheet/318589.pdf
> 
> > Not all operating systems can support dual processors with mixed
> > frequencies. Mixing
> > processors of different steppings but the same model (as per CPUID
> > instruction) is
> > supported. Details regarding the CPUID instruction are provided in
> the
> > AP-485 IntelR
> > Processor Identification and the CPUID Instruction application note.
> 
> but OTOH, it seems that mixing both settings of L5420 caused some
> trouble on Intel S5000 boards before they updated the BIOS...
> 
> http://downloadmirror.intel.com/18075/eng/release.txt
> 
> 
> Cheers,
> 
> Tim.

Thanks for taking the time to follow up on this Tim.

I spoke with someone at Intel and the response was, "if it's working, don't
worry about it" :)

In the future on this server if I have any system instability issues or
other bizarre symptoms I will know the first place to look.

Thanks,

--
pjf




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