Author: Bo Persson
Date: 12:54:21 06/07/03
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On June 07, 2003 at 15:19:19, Tom Kerrigan wrote: >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. Yes, sure! My faster box has about a 50% increse in CPU speed, and the NPS is also 50% higher, even though the memory is supposed to be slower. Memory bandwidth is not significant, even though Intel pushed HARD for the RAMBUS version earlier. > >-Tom Bo Persson bop2@telia.com
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