Author: Aaron Gordon
Date: 11:40:49 06/07/03
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On June 07, 2003 at 10:44:14, Robert Hyatt 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? >> >>Pete > > >The issue is latency. bandwidth is secondary since it is not common to move >large blocks of memory around in a chess engine, unless someone is using >the "copy/make" approach. > >As a general rule, buss speed is not going to affect latency much, unless you >dive into overclocking to see how far you can push the envelope. > >I've compared my dual 2.8 with 400mhz fsb to a dual 2.8 with 533mhz fsb and >I couldn't see much difference at all... All of the SMP boards I've seen have pretty poor latency. If you test the newer single CPU systems you see a near linear speedup in MHz of the fsb vs latency. This is at 100fsb, 133, 166 & 200fsb... non-overclocked speeds.
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