Author: Matt Taylor
Date: 17:19:16 12/04/02
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On December 04, 2002 at 18:35:16, Vincent Diepeveen wrote: >On December 04, 2002 at 11:09:14, Matt Taylor 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 >> >>If you are working with a database, bandwidth is going to be important. Latency > >i do not know which databases you use or how big your queries are, >but if i browse in immense databases, then latency is very very important :) > >In which case DDR ram is exactly 2 times faster. > >O yes, also over 2 times cheaper too :) It is cheaper, which is why my home system is AMD instead of Intel. Actually, you could make the argument that low-end AMD-based DDR systems running in parallel have higher overall performance than an RDRAM system. If it is true that latency is the issue, then SDRAM would further lessen the cost, particularly since you can pair it with lower-end chips (cheaper) without taking a performance hit. I saw your computation of latency in the other post, but pc1066 RDRAM is also clocked at 133 MHz. This would be an overall latency difference of 50%, not 100%. As for the database, the latency vs. bandwidth bottleneck depends on your hashing algorithm, I suppose. I was assuming that most queries could be satisfied serially. After thinking about it, I'm not sure. I've never used an end-game database, but I am interested enough now that I may implement one when I get a little free time.
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