Author: Frank E. Oldham
Date: 06:01:56 04/24/98
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On April 24, 1998 at 08:11:51, Ernst A. Heinz wrote: >For computer chess, the integer-wise and MHz-wise "slow" POWER CPUs >are no good choice at all. >=Ernst= The Alpha 21164 has performance of 18.8 SPECint95, 29.2 SPECfp95 at 600 Mhz (with 8 MB L3 cache chip). Pentium II at 400MHz is 15.8 SPECint95, 12.4 SPECfp95 (with just 1MB of L2 cache at 2:1 ratio). Note that the integer performance is pretty close -- PPC750 is also catching up similarly -- the long pipelines of the Alpha are hard to keep from stalling. (Although for crafty the 64-bit-ness is a real win!). The new POWER3 chip I mentioned previously has estimated performance of 30+ SPECint95, 70+ SPECfp95 at frequency 500 MHz. The alpha competitor to POWER3 is the Alpha 21264 (which lots of people are waiting for!). I checked about the external bus size of the Alpha 21164 -- it's 128-bits (see http://www.digital.com/semiconductor/alpha/21164-fact.html), so I'll again assert that I'm impressed by the 256-bit external cache bus of the POWER3 -- even if no one else is ;-) Frank
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