[gmx-users] Athlon SSE vs. 3Dnow

Erik Lindahl lindahl at stanford.edu
Thu Nov 14 21:46:33 CET 2002

David van der Spoel wrote:

>On Thu, 2002-11-14 at 13:30, Anton Feenstra wrote:
>>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
Right. And SSE is IEEE compliant (not that it matters lot), so even AMD 
recommend it over 3DNow.



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