Author: Aaron Gordon
Date: 18:57:21 06/18/04
Go up one level in this thread
On June 18, 2004 at 14:02:22, Yen Art Tham wrote: >On June 18, 2004 at 08:51:34, Aaron Gordon wrote: > >>On June 18, 2004 at 06:39:17, Vincent Diepeveen wrote: >> >>>On June 17, 2004 at 21:39:26, Aaron Gordon wrote: >>> >>>You asked for example : >>> >>>Why filling all banks of a P4C/P4EE cas2 is helping a lot for DIEP you can read >>>at www.aceshardware.com, hardware reviews from the different processors and >>>comparing them against each other. >>> >>>The speedups reported by Johan thanks to SMT/HT only could get reproduced by >>>testers with all memory banks filled. If you fill 1 bank only, you don't get >>>like 21% speedup out of HT at all. >>> >>>See www.aceshardware.com >> >>Looks like he agrees with me: >> >>His quote: "No surprises here, as DIEP is more or less immune to faster memory >>subsystems." >> >>Link to page: >>http://www.aceshardware.com/read.jsp?id=65000313 >> >>If you notice in the benchmarks, DIEP speeds up 1kn/s (148 to 149) going to >>lower latency non-registered / non-ecc memory on the same CPU. Now double memory >>bandwidth, you'll notice no difference. Only difference I've seen is from >>decreasing memory/bus latency. Even then it is EXTREMELY small and one could say >>it is within margin of error. > > >In other words, there is no significant difference in the performance of a chess >program when using either generic memory or expensive memory like Corsair. >Correct? Exactly. I have both, infact. 3 sticks of PC2700 XMS Corsair and 1 stick of PC3500 XMS corsair. The PC2700 will do up to 220fsb at CAS3 (3-4-4-9) and the PC3500 can do 223fsb at CAS-2 (I think 2-3-3-6 or 7), but can do almost 250fsb at CAS-2.5. Also have some older Corsair PC2400 and Crucial PC2100. Testing between the PC2100 and Corsair PC3500 with the same settings (fsb speed & latency settings) results in identical latency, and bandwidth. The only ability the good memory gives you over the cheaper/slower ram is the option to clock it higher and set the latency lower at those higher clock speeds. It won't be faster with the same settings. Some websites may report there are differences, but they are so ridiculously small that if you run the benchmark (usually Sisoft sandra) over and over, you'll notice the score jumps around quite a bit.
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