[Beowulf] FPU performance of Intel CPUs

Tiago Marques a28427 at ua.pt
Mon Apr 6 05:41:28 EDT 2009


On Sun, Apr 5, 2009 at 11:28 PM, Mark Hahn <hahn at mcmaster.ca> wrote:

>
>  I'll get an answer: is there any remarkable difference
>>>> in FPU performance between Extreme and non-Extreme
>>>> Intel CPUs, e.g. QX9650 and Q9650?
>>>>
>>>
>>> of course not - the chips are the same inside, so deliver
>>> exactly the performance you expect from their operating clock.
>>> same cache, same clock, same fsb, so same performance...
>>>
>>> as far as I can seem the only difference is that the X
>>> is an older stepping, has a higher TDP and lower thermal spec.
>>>
>>>  And unlocked FSB multipliers.
>>
>
> well, in the HPC world, correctness is normally paramount,
> so no form of overclocking is considered much...

I didn't say it was, but since no one mentioned that fact I wanted to
highlight it, since it's pretty much the only significant difference for the
non-HPC world.
Best regards

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