Author: Dann Corbit
Date: 21:55:19 12/27/05
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On December 28, 2005 at 00:36:53, Juan Pablo Naar C. wrote: >Zappa is running at 128 cpu 1.6ghz itanium2 >Hydra is running at 64 cpu 3.2ghz xeon > >calculating by ghz, they are running at the same speed! or am i just plain >wrong?? You are just plain wrong. The Xeon CPUs on Hydra are almost irrelevant. The real horsepower is in the custom chess circuits. The Xeons are just message passers, for the most part. The bulk of the computation is happening in custom integrated circuits that do things like "Nxe4+" instead of "mov EAX, 0xDEADBEEF". I seem to recall that Hydra does about 200M NPS. I guess that Zappa might get up to 80M NPS on that configuration. So, very likely the NPS of Zappa might come to within a significant portion of Hydra (but not due to the Xeon chips, really). But the NPS is not important anyway. I can look at a trillion wrong nodes in a second and not make decisions that are any better than looking at a few better nodes. With chess engines, like many other things, "The proof of the pudding is in the eating."
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