P4 SSE2 not present in Options->CPU :-( - Page 2

paulunderwood · 2002-09-16, 18:29

Quote:

have a question...

Why your XP1600 runs faster than XP1700?

Luigi

The XP1600+ is on an overclockable motherboard; the XP1700+ is. Might be worth swapping them around.

Prime95 · 2002-09-16, 20:37

Aha! The 2^N+1 FFT code is not SSE2 optimized. In fact, on a P4 it is faster to ecm M64680 (M32340 * P32340), than it is to ecm P32340.

The only reason 2^N+1 FFT code was never SSE2 optimized is my lack of time and energy and other priorities being more important.

Sorry for the confusion!

paulunderwood · 2002-09-16, 20:43

No problem. Prime95 is great. Thanks for your help. Happy hunting ;)

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2002-09-16, 20:37	#13
Prime95 P90 years forever! Aug 2002 Yeehaw, FL 10000001010111₂ Posts	Aha! The 2^N+1 FFT code is not SSE2 optimized. In fact, on a P4 it is faster to ecm M64680 (M32340 * P32340), than it is to ecm P32340. The only reason 2^N+1 FFT code was never SSE2 optimized is my lack of time and energy and other priorities being more important. Sorry for the confusion!

2002-09-16, 20:43	#14
paulunderwood Sep 2002 Database er0rr 5×937 Posts	No problem. Prime95 is great. Thanks for your help. Happy hunting ;)