Author: Jeremiah Penery
Date: 10:55:47 12/04/02
Go up one level in this thread
On December 04, 2002 at 13:32:01, Vincent Diepeveen wrote: >On December 04, 2002 at 11:42:17, Matt Taylor wrote: > >>On December 04, 2002 at 10:43:59, Vincent Diepeveen wrote: >> >>>On December 04, 2002 at 10:21:08, James T. Walker wrote: >>> >>>>On December 04, 2002 at 08:00:35, martin fierz wrote: >>>> >>>>>hi, >>>>> >>>>>i'm on the lookout for a new PC for endgame database computations. i'll probably >>>>>be buying a lot of ram, 2-3GB. i see that there is a big price difference >>>>>between DDRAM and SDRAM. IIRC the main difference is that you get a larger >>>>>bandwidth, but about the same latency with DDR - so i suppose i'm better off >>>>>buying SDRAM for my application. any opinions of the experts? >>>>> >>>>>thanks in advance >>>>> martin >>>> >>>>For what it's worth: I purchased one stick (256M) of DDR ram to compare to my >>>>cheap SDRAM. I found no noticable difference in chess performance (just price). >>>> I did not do any extensive testing. I simply compared Fritz marks. I suspect >>>>that in the future most motherboards will not accept the SDRAM. >>>>Jim >>> >>>I see a big difference. 64 versus 32 bytes cache lines matters >>>a lot for DIEP and all software that doesn't fit within L1 cache. >>> >>>Best regards, >>>Vincent >> >>Cache line size is a part of the CPU, not the ram. There are a number of >>transitional products, both P4 and Athlon, that accept both SDRAM and DDR SDRAM. >>(However, I have never heard of anyone happy with these products.) > >the P4 ended up being a lot faster for DIEP when i tested a p4 with ddr ram >isntead of RDRAM. > >P4 with ddr ram (northwood) is like 1.5 : 1 for a K7 >used to be 1.7 : 1 to a k7 with rdram. > >So 1.7 Ghz P4 rdram == 1.0Ghz K7 for DIEP > 2.4 Ghz P4 ddr == 1.6Ghz K7 for DIEP (both ddr). > >DDR is a big step forward!! > >i don't know where the processor gets 64 bytes instead of 32 bytes in >the design. I just know it gets 64 bytes, versus SDRAM 32. Hash probes in a chess program depend on latency, not bandwidth. RDRAM sucks for latency, where it is at least double that of SD/DDRAM. For the tablebase creation, I would expect this to depend much more on streaming bandwidth - there, RDRAM will win.
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