Author: Aaron Gordon
Date: 12:02:45 04/16/03
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On April 16, 2003 at 14:14:03, Robert Hyatt wrote: >On April 16, 2003 at 06:01:59, Aaron Gordon wrote: > >>On April 16, 2003 at 05:54:21, Javier Ros Padilla wrote: >> >>>What is the difference in chess programs between DDR and PC133 SDRAM? >>> >>>Javier Ros >> >>With smaller hash sizes (1-64mb) you'll see no speed/strength increase in chess >>programs. With very large hash sizes however (and depending on the program) you >>should see a 2-7% increase in Kn/s. I did the tests a while back, if I can find >>the results I'll post them here for you. > > >The interesting thing is that in the testing I have done, the SDRAM provides >lower >latency, which is pretty important. Not _way_ lower, but 20ns or so... Probably depends on the chipset. On DDR chipset I have (KT333) gives 2.7gb/s bandwidth at 200fsb(400DDR) and 95ns latency while the Nforce2 I have gets 3.2gb/s and 75ns latency. I don't know the ins and outs of chess programming so I'm not sure why this is.. but when I tested ~180ns 1.6gb/s vs 75ns 3.2gb/s I saw no speed difference (with a smaller hash table). Normally I think 100fsb(400DDR) on an nforce2 is ~125ns but as soon as you go asynchronous the latency goes to hell heh. So, never run asynchronous (mem/bus) on any board if you have the option available.
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