DDR ram & thrashing L1/L2 cache

Brian Haymore brian at chpc.utah.edu
Tue Mar 13 07:04:43 PST 2001

Velocet wrote:
> Anyone played with boards that support DDR ram @ 266Mhz with Gaussian98 or
> other computational software that thrashes the cache?
> Im finding that the increased bus speeds on any of the boards and CPUs
> I've been testing with g98 is the biggest speedup over any other factor.
> (cache size on board, cache speed, etc).
> I am wondering if anyone has comparisons for the same CPUs with the same
> amount of ram on DDR and non DDR boards+memory for jobs that thrash cache.
> Thanks.
> /kc
> --
> Ken Chase, math at velocet.ca * Velocet Communications Inc.  * Toronto, CANADA
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I will have these results from a 1.2Ghz Athlon with a 266Mhz FSB and
PC2100 memory in a few days.  I'll post my results to the list then.

Brian D. Haymore
University of Utah
Center for High Performance Computing
155 South 1452 East RM 405
Salt Lake City, Ut 84112-0190

Email: brian at chpc.utah.edu - Phone: (801) 585-1755 - Fax: (801) 585-5366

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