It's major improvement is an 10 till 20%I think I got a bit more than that on my XP1700 system.
speed gain on Athlons if I recall correctly.
On my machine it was about 30% (counted for 512K FTT and for 2048K FTT). Results below. Some can be caused by switching from Windows to Linux in the same time (yeah, there can be difference in running programs in system default, firewall and that sort of thing).
AMD Athlon(tm) XP 2200+ CPU speed: 1806.53 MHz CPU features: RDTSC, CMOV, PREFETCH, MMX, SSE L1 cache size: 64 KB L2 cache size: 256 KB L1 cache line size: 64 bytes L2 cache line size: 64 bytes L1 TLBS: 32 L2 TLBS: 256 Prime95 version 23.8, RdtscTiming=1 Best time for 384K FFT length: 46.687 ms. Best time for 448K FFT length: 54.545 ms. Best time for 512K FFT length: 58.935 ms. Best time for 640K FFT length: 75.595 ms. Best time for 768K FFT length: 90.098 ms. Best time for 896K FFT length: 106.303 ms. Best time for 1024K FFT length: 121.101 ms. Best time for 1280K FFT length: 163.249 ms. Best time for 1536K FFT length: 191.210 ms. Best time for 1792K FFT length: 243.282 ms. Best time for 2048K FFT length: 277.863 ms.
AMD Athlon(tm) XP 2200+ CPU speed: 1805.66 MHz CPU features: RDTSC, CMOV, PREFETCH, MMX, SSE L1 cache size: 64 KB L2 cache size: 256 KB L1 cache line size: 64 bytes L2 cache line size: 64 bytes L1 TLBS: 32 L2 TLBS: 256 Prime95 version 24.6, RdtscTiming=1 Best time for 512K FFT length: 39.152 ms. Best time for 640K FFT length: 51.208 ms. Best time for 768K FFT length: 62.428 ms. Best time for 896K FFT length: 75.318 ms. Best time for 1024K FFT length: 85.398 ms. Best time for 1280K FFT length: 120.419 ms. Best time for 1536K FFT length: 144.943 ms. Best time for 1792K FFT length: 171.764 ms. Best time for 2048K FFT length: 196.540 ms.
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