Author: Slater Wold
Date: 20:19:14 09/04/02
Go up one level in this thread
On September 04, 2002 at 23:13:48, Aaron Gordon wrote: >On September 04, 2002 at 22:26:13, Robert Hyatt wrote: > >>On September 04, 2002 at 22:03:24, martin fierz wrote: >> >>>...or in the short version, 1.69 more nps for the 2-processor box. >> >> >>Totals so far: >> >>dual xeon 1700mhz 1.84X raw NPS >>quad xeon 700mhz 1.90X raw NPS (using only two processors) >>dual AMD 1730mhz 1.67X raw NPS > >Hyatt, please shed some light on this for me. Here's something I've been >noticing.. It appears the faster the chips involved the slower the speedup gets. >It seems the older machines get a 1.8-1.9x speedup where as some of the newer >machines (fast dual AMD's, some of the higher end dual P4's) get lower speedups. >Is this due to memory bandwidth limitations perhaps? What are your >thoughts on this? The post is now gone, but Robert already answered that question. His "guess" was that it was memory bandwidth. And that's why P4's lose less than AMDs. (In a particular position a P4 got about .1 more speedup than AMD. It may or may not apply to all positions.) He also stated he had a dual 300 once that would get a 2x speedup on almost all positions.
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