Author: Andrew Slough
Date: 11:41:22 08/05/99
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On August 05, 1999 at 10:29:47, Robert Hyatt wrote: >On August 05, 1999 at 08:50:13, Randy Schmidt wrote: > >>I am curious if there are opinions on whether a program would >>benefit by using the Xeon processor and under what circumstances. > >The xeon is somewhat faster. A PIII runs the L2 cache at core cpu speed/2, >while the xeon runs the L2 cache at core cpu speed. IE the L2 cache is 2x >faster on the xeon. That is the only difference, but it is definitely a >measurable difference... The L2 cache on the Xeon does run at 2x the clock of a PIII, but it is not quite accurate to say the L2 cache is 2x faster on the Xeon. On the Xeon L2 cache accesses are 14-1-1-1 (ie 14 processor clocks for the first word read and one cycle for each consecutive read) on a PIII, cache accesses are 18-2-2-2. That means a PII has at worst a 50% slower L2 cache (for the case where the word being read is at the end of the cache line) and at best 28% slower. The celeron has a faster but smaller L2 cache (than Xeon) and runs at 8-1-1-1. Andy
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