Author: Vincent Diepeveen
Date: 04:28:08 06/19/04
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On June 19, 2004 at 06:34:18, Vincent Diepeveen wrote: Measured with Dieter's dblat the random latency differences with 500MB buffer: A64 133Mhz cas3 171 nanoseconds A64 200Mhz cas2 91 nanoseconds >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? > >Wrong. > >Using cas2 400Mhz memory is way faster than 200Mhz cas3. > >*real huge* difference.
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