Author: Vincent Diepeveen
Date: 05:26:31 03/30/01
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On March 29, 2001 at 14:45:55, Dan Andersson wrote: You aren't mistaking DDR RAM for RDRAM here? DDR RAM is SDRAM at double speed, so it can never be slower. Only 2 times faster! >According to SPEC there is almost no speed difference between DDR2100 and PC133 >SDRAM, a 157 second run compared to a 158 second run. But that was on a AMD 1.2 >GHz processor. While we are on it be certain that it is PC2100 SDRAM and not the >slower PC1600 SDRAM. The reason that the faster memory might not be a win is >that the speed of RAM can be measured in quite a few ways. PCXXXX RAM is >speedier than PC133 RAM in reading data in a stream i.e. a lot of data that lies >after each other in memory and then transferring it, think graphics/video and >sound. But another kind of speed is the time it takes to find and send one or a >few words, chess positions and messages. Memory that is fast at finding and >transferring data both, are in general very expensive. As for your other >question, yes doubling a transposition table should speed up a search, my rule >of thumb is 5% speed increase (almost nothing ratingwise) per doubling as long >as I have enough RAM to hold the table. > >Reagrds Dan Andersson
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