Author: Robert Hyatt
Date: 07:44:14 06/07/03
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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...
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