Author: Tom Kerrigan
Date: 09:56:03 03/18/03
Go up one level in this thread
On March 18, 2003 at 10:04:56, Robert Hyatt wrote: >>>>Using the Nforce2 chipset I'm able to run the ram at speeds from 50% up to 200% >>>>(100% being synchronous) of the fsb speed. I tested 200MHz FSB (400DDR) with >>>>200MHz memory (400DDR) and 200fsb with 100MHz memory (200DDR). >>>>The difference between ~1.6gb/s memory and ~3.2gb/s memory with craftys 'bench' >>>>command was 0.14%. Yes, about one seventh of one percent. >>> >>>That might well suggest _another_ bottleneck in that particular machine.... >> >>What would that be? >> >>I ran a similar test on my AthlonXP 2500 w/nForce 2 chipset. Running the memory >>bus at 100 MHz or 133 MHz didn't make a significant difference in nps. The >>processor scored around 1.12 MN/s, and it scored some 20-30 KN/s more with a 133 >>MHz memory bus. The FSB was 166 MHz in both cases. >> >>-Matt > >Were I guessing, I would guess the following: > >1. no interleaving, which means that the raw memory latency is stuck at >120+ns and stays there. Faster bus means nothing without interleaving, >if latency is the problem. Uh, wait a minute, didn't you just write a condescending post to me about how increasing bandwidth improves latency? (Which I disagree with...) You can't have it both ways. Faster bus speed improves both latency and bandwidth. How can it not? -Tom
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