[gmx-users] Athlon SSE vs. 3Dnow

[Erik Lindahl]

David van der Spoel wrote:

>On Thu, 2002-11-14 at 13:30, Anton Feenstra wrote:
>
>>Hi,
>>
>>
>>I noticed that on our old, single Athlon 1GHz nodes mdrun uses the
>>3Dnow instructions, while on the new, dual Athlon 1.3GHz it uses the
>>SSE instructions. My feeling is that the (Athlon specific) 3Dnow would
>>be faster. So, why is SSE used? Is SSE (if available - the 1GHz CPU's 
>>don't have it) or 3Dnow faster on Athlons?
>>
>
>Eric tested it, and SSE is faster. So 3DNow will not be developed much
>more.
>
Right. And SSE is IEEE compliant (not that it matters lot), so even AMD 
recommend it over 3DNow.


Cheers,

Erik


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