Author: Vincent Diepeveen
Date: 10:32:01 12/04/02
Go up one level in this thread
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. Best regards, Vincent
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