Author: Matt Taylor
Date: 23:00:25 03/19/03
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All of these tests were run on an MSI K7N2G-ILSR (nForce 2 chipset) under Slackware 8.1 using a pc2100 DDR DIMM from Micron. The FSB speed was held constant at 166 MHz in each test. Just for grins, I threw in a Crafty score. I ran Crafty thrice for the first test, but after observing that the figure did not measurably change, I ran it only once on the other tests. I ran lmbench three times and averages the scores for each trial. Mem bus | RAS | RCD | RP | CAS | LM lat (ns) | Crafty score ------------------------------------------------------------ 133 MHz | 6 | 3 | 3 | 2.5 | 177.6 | 884,042 nodes/sec 100 MHz | 5 | 2 | 2 | 2 | 187.4 | 884,042 nodes/sec 166 MHz | 7 | 3 | 3 | 2.5 | 117.8 | 896,671 nodes/sec 200 MHz | 9 | 4 | 4 | 3 | 139.9 | 896,671 nodes/sec First, you notice that nForce 2 -really- does not like running the FSB faster than the memory bus. Second, you notice that Crafty hardly cares about memory latency or bandwidth. BTW, before anyone comments on the abnormally low Crafty scores, I threw together an unoptimized binary. The same system was pulling >1,150,000 nodes/sec last week under Windows. -Matt
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