At 11:28 AM 9/16/1999 -0400, St. Dee wrote: >Does anyone else notice that their Celeron based machines seem to take a >relatively bigger performance hit when moving from testing exponents in the >384K FFT size to the 448K FFT size (under V18.1, at least)? > >I have a couple of non-overclocked Celeron 400 machines and, at the 384K >FFT size, they report timings nearly identical to those George sent out in >his email message of a couple of days ago, timings generated by his >PII-400. However, when the machines test exponents with the 448K FFT size, >they are more than 20% slower! Is the Celeron's relatively small L2 cache >finally causing it to lose ground to the PII/PIIIs as the FFT sizes get >larger and larger? Accccckkkkkk! That was rather inexact wording. Let me try again...my Celeron 400 based systems crunch exponents in the 384K FFT range at about the same speed as George's PII-400 machine. However, at the 448K FFT size, George's machine appears to be 20% or more faster than my Celeron 400s. Could the 128K L2 cache of the Celeron chips (vs. the 512K L2 cache of the PIIs) be the culprit? Thanks, Kel _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
