Author: Tom Kerrigan
Date: 12:19:19 06/07/03
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On June 07, 2003 at 10:21:38, Bo Persson wrote: >On June 07, 2003 at 08:47:52, Peter Stayne wrote: > >>I believe I saw a thread a long time ago on the Winboard forum where Robert >>Hyatt was discussing this, but I can't find it. >> >>Given equivalent CPU capabilities, would an engine on a machine with one of the >>new 800MHz P4 QDR buses get a large or small or non-existent boost in speed over >>standard DDR at say, 266MHz? or even SDRAM at 100/133? >> >>My 533MHz QDR operates at the same frequency as even old PC133 SDRAM memory, but >>it delivers 4x as much data at each interval. Is the base frequency of the RAM >>more important, or the amount of data overall? > >For a chess program, the access time (latency) is more important than the >maximum throughput. > >I have 2 P4s, with different memory systems: > >P4 1.7 GHz, dual channel RDRAM, 2.5 GB/s stream throughput (SiSoft Sandra) >P4 2.5 GHz, 533 MHz SDRAM, 1.9 GB/s throughput > > >Guess which is the fastest for chess programs! :-) Sure, CPU performance is roughly 90% of a chess program's performance. (Maybe more?) Memory latency is the remaining 10%. So if you have infinitely fast memory, you'll only run a few percent faster, but any change in CPU speed will result in a significant difference. -Tom
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