[Sunhelp] Dual CPU SPARC20

[Mike Gracy (Ghost Rider)]

Shouldn't be a problem.  The processors are made in batches so the batch
numbers may be different, but as long as the speed rating and features are
the same it will work.  I'm not sure, but if the part #'s are different I
would double check feature sets before inserting.  They may be using the
part #'s to differentiate between revisions of the same processor (like
versioning on software).

-----Original Message-----
From: The XUMA Ghostrider mailing list
[mailto:GHOSTRIDER at LISTSERV.XUMA.COM]On Behalf Of Martin Marshall
Sent: Wednesday, November 22, 2000 5:32 AM
To: GHOSTRIDER at LISTSERV.XUMA.COM
Subject: Re: [Sunhelp] Dual CPU SPARC20


James Lockwood wrote:
>
> On 13 Nov 2000, Alan Robinson wrote:
>
> > Actually it is possible in some cases to run CPUs with different speeds.
I
> > have been using an SM71/SM61 combination in an SS10 for several months
now.
> > The only problem that I have seen is with the CDE image viewer which
crashes
> > when both CPUs are enabled (via psradm). Outside of that little glitch
it
> > works quite well. As Bill points out the question is how reliable a
> > non-matched set will be. Not every combination works. Anyone else have
> > experience with non-matched CPUs?
>
> You can _probably_ safely mix:
>
> SuperSparc-I CPU's with SuperCache (SM41/51/61) with each other.
>
> SuperSparc-II CPU's (SM71/81) with each other.
>
> Most older Ross HyperSparcs with each other.
>
> You can also mix a SM50 and an MP-capable SM40 in a SS10 as they're
> essentially the same module, just rated for different speeds.
>
> -James
>

In a related question, can any SM71 be used with any other SM71
processor in a dual processor SS10 (Boot PROM 2.25) or does a dual
processor configuration require using SM71 processors with the same part
number?  Does anyone know Sun's position on this question?  I have one
501-3001 processor and would like to add a second processor to my SS10.

Thank you,
Martin Marshall
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