[gmx-users] pentium III vs Pentium IVs

David van der Spoel spoel at xray.bmc.uu.se
Mon Mar 25 12:51:05 CET 2002

On Sun, 24 Mar 2002, Erik Lindahl wrote:

>The only reason to go with Pentium4 is if you need double-precision in 
>your MD calculations.
Or if you do something else, besides MD, that uses a lot of double 
precision floating point. Benchmarks of Gaussian (quantum chemistry) show 
that the fastest P4 is quite a bit faster than the fastest Athlon.

>We've just been researching systems to update our local cluster in the 
>group here at Stanford; per processor it can actually be cheaper to go 
>with single-cpu systems, but I would still recommend dual-cpu boxes if 
>you want to run in parallel since the scaling is much better withing 
>each node (no ethernet communication involved).
>Dual Pentium4 ("Xeon") boxes are insanely expensive, but the Athlon MP 
>systems are reasonable!
Again, I don't agree completely... Dual Xeons are more expensive, but not 
much more, maybe 30% (but also faster for MD as well as for Gaussian). 
There are now motherboards that use DDR memory which is slightly cheaper 
than RDRAM.

Groeten, David.
Dr. David van der Spoel, 	Biomedical center, Dept. of Biochemistry
Husargatan 3, Box 576,  	75123 Uppsala, Sweden
phone:	46 18 471 4205		fax: 46 18 511 755
spoel at xray.bmc.uu.se	spoel at gromacs.org   http://zorn.bmc.uu.se/~spoel

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