Author: Jeremiah Penery
Date: 17:57:46 04/18/03
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On April 18, 2003 at 18:57:29, Joshua Haglund wrote: >> >>RAMBUS ram has a pretty good bandwidth number. The problem with it is it also >>comes with a pretty bad latency number. >> >>I've run Crafty on most everything and I get the best performance on SDRAM. DDR >>is next with RAMBUS in third place. > >What would those latency numbers be? You can look up these numbers at a million websites. The problem is that it depends heavily on the FSB speed, the speed of the memory chips, the motherboard chipset, and probably other things. I think in general, the average latency for SDR/DDR is slightly above 100ns for a single processor system (133MHz bus). With some tweaking it can be pushed lower, but it can also be higher in some cases. Multiple processor machines usually have a bit higher latency, for example. I've seen widely varying claims of the latency of RDRAM. There are more factors in calculating the latency of RDRAM, so I guess it's not surprising. Latency can be anywhere from 100-300ns, I guess, but more typical is probably 150-200ns. I could be wrong about this.
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