Author: Tom Kerrigan
Date: 09:00:38 08/20/04
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On August 20, 2004 at 07:26:28, martin fierz wrote: >On August 20, 2004 at 04:33:07, Tom Kerrigan wrote: > >>Now that AMD is selling two processors that are identical other than L2 cache >>size (Sempron has 256k, Athlon 64 has 512k) we have proof of Crafty's working >>set size: >> >>Sempron: 1,080,020 NPS >>Athlon 64: 1,080,230 NPS >> >>http://www.anandtech.com/linux/showdoc.aspx?i=2170&p=3 >> >>This should prove once and for all that Crafty's working set is < 256k and >>therefore that size of L2 cache has no effect on its performance (as long as >>it's >= 256k) and that main memory speed likely plays a trivial role >>performance-wise. >> >>I bring this up because of all of the long debates that have occurred in the >>past about the value of L2 cache, the speed of memory, and the working set size >>of chess programs. >> >>I have no doubt that Crafty uses a bunch of memory, but obviously not with >>enough temporal locality for it to matter one iota. >> >>-Tom > >if i read this right, then the sempron 3100+ would be a very good choice for a >(computer-chess-)power hungry user on a tight budget. correct or not? is there >anything better out there price/performancewise right now? That would be a pretty darn tight budget. The price difference between a Sempron 3100+ and an Athlon 64 2800+ is only $20. They run at the same clock speed but the A64 has twice the cache and 64-bit mode, which are fairly unimportant for computer chess but useful features to have in general. You could save yourself a bunch of money by getting a Duron and a Socket A motherboard instead of a Sempron 3100+ and a socket 754 motherboard. 1.8GHz Duron: $49 MSI Socket A motherboard: $48 Sempron 3100+: $128 MSI Socket 754 motherboard: $83 ($114 difference) -Tom
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