[Beowulf] quad-core SPECfp2006: where are 4 FPresults/cycle ?

Mikhail Kuzminsky kus at free.net
Sat Oct 13 11:10:14 EDT 2007


In message from richard.walsh at comcast.net (Fri, 12 Oct 2007 20:50:08 
+0000):
>Mikhail,
>I am not sure I fully understand what you are presenting here, but I 
>might say that yes, at the FPU unit level the 2222 series AMD 
>Opteron/Barcelona and the Intel Core2/Clovertown (and also Harpertown 
>at 45 nm) are now more largely equivalent -- that is they both can 
>execute 2, double-wide (2x64 bit) floats in certain FMA situtations 
>simultaneously and/or in a pipeline. 
....
>Regards,
>rbw
>-- 
   Sorry, now I'm misunderstanding :-)
I thought that Opteron 2222 don't have Barcelona microarchitecture 
(all the Barcelona's are 23xx or 83xx) and therefore can't perform 
4*64 bit FP results per cycle. Am I wrong ?

Mikhail 
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