Author: Aaron Gordon
Date: 15:21:48 12/07/05
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It appears Rybka is no different than other engines when comparing L2 cache size. I'd like to test on larger cache chips though sometime. Anyway, here is what I have so far. Both cpus have the exact same core, the only difference is cache size. Both cpus were tested in the same computer so everything but the L2 cache size was the same. Athlon (Thunderbird) 800MHz, 128k L1 cache, 256k L2 cache: 3988843 nodes in 106.394 seconds = 37494.76 NPS Duron (Spitfire) 800MHz, 128k L1 cache, 64k L2 cache: 3988843 nodes in 109.579 seconds = 36401.52 NPS So, going from 64k L2 (192k total on-chip cache) to 256k L2 (384k total on-chip cache) yielded a 3% increase in performance. Perhaps cache speed makes more of a difference instead? The only chips that are relatively identical except for the cache speed (that I can think of) are the Mendocino Celeron 533 and the Coppermine Celeron 533. I do not have either of these chips though... I'll try doubling memory speed on my Athlon 64 (single channel at 3.5gb/s vs dual channel at 7gb/s) and see how that changes Rybka performance. If it doesn't do anything (or much), then I'll have to guess that cache speed is the factor behind the Celeron-P4 core being significantly slower than the standard P4 at the same clock speed. Anyone have any ideas/suggestions?
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