Author: Robert Hyatt
Date: 20:22:02 09/04/02
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On September 04, 2002 at 23:19:14, Slater Wold wrote: >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. Be careful with the terminology. The 2x was in raw nps, which may or may not be the same as the actual "speedup"...
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