PCDVD數位科技討論區 - 瀏覽單個文章 - 關於Super PI與Prime95二三事

SSE2確實是造成差異的"主要原因". 君不見http://www.mersenne.org/bench.htm
裡要特別將有無支援SSE2的數據分開列表?

如果Reich兄有其他的發現及心得, 還望不吝分享給大家喔.

引用:

Originally posted by Reich 唐
謝謝petitdragon大的回應，不過連FSB 400的P4也能打敗FSB400的Athlon XP喔？！

以下是天昏地暗大的測試：
AMD Athlon(tm) XP
CPU speed: 2104.68 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 23.7, RdtscTiming=1
Best time for 384K FFT length: 27.001 ms.
Best time for 448K FFT length: 30.911 ms.
Best time for 512K FFT length: 33.238 ms.
Best time for 640K FFT length: 44.717 ms.
Best time for 768K FFT length: 53.248 ms.
Best time for 896K FFT length: 64.365 ms.
Best time for 1024K FFT length: 71.097 ms.
Best time for 1280K FFT length: 93.003 ms.
Best time for 1536K FFT length: 112.272 ms.
Best time for 1792K FFT length: 137.010 ms.
Best time for 2048K FFT length: 157.624 ms.

以下是blackmeat兄的測試：
Intel(R) Pentium(R) 4 CPU 1.80GHz
CPU speed: 1817.91 MHz
CPU features: RDTSC, CMOV, PREFETCH, MMX, SSE, SSE2
L1 cache size: 8 KB
L2 cache size: 512 KB
L1 cache line size: 64 bytes
L2 cache line size: 128 bytes
TLBS: 64
Prime95 version 23.7, RdtscTiming=1
Best time for 384K FFT length: 22.903 ms.
Best time for 448K FFT length: 27.195 ms.
Best time for 512K FFT length: 30.901 ms.
Best time for 640K FFT length: 37.076 ms.
Best time for 768K FFT length: 45.439 ms.
Best time for 896K FFT length: 54.980 ms.
Best time for 1024K FFT length: 59.383 ms.
Best time for 1280K FFT length: 80.692 ms.
Best time for 1536K FFT length: 108.931 ms.
Best time for 1792K FFT length: 133.692 ms.
Best time for 2048K FFT length: 146.539 ms.

這樣誇張的差距，弟覺得應該不止SSE2這一點有影響？但不是很了解就是了，希望您能抽空解答，謝謝。