Author: Tom Kerrigan
Date: 12:15:31 06/07/03
Go up one level in this thread
On June 07, 2003 at 14:40:49, Aaron Gordon wrote: >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. Thank god for AMD & Opteron. :) -Tom
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