[gmx-users] Re: latest benchmarks (Itanium/Xeon/Opteron)
lindahl at csb.stanford.edu
Mon Jan 19 12:23:01 CET 2004
> OK, Thanks Erik for the prompt reply. Can I add the factor 2 to your
> by David that "According to Erik Lindahl a 900 MHz Itanium is slightly
> than a 3 GHz Xeon for gromacs (next version)", so that a 1.4GHz
> Itanium2 would
> about three times the speed of a 3GHz Xeon?
No, IIRC that was with the assembly loops, but for a water system - for
a non-water system the performance on Itanium is relatively better
compared to Xeon.
> Then remains the relative performance of Xeon versus Opteron. Any
> on that anyone?
Until the AMD issues with SSE are sorted out I won't recommend Opteron
to anybody. It's not horribly bad, and you'll always be able to use
3DNow, it's just that the Xeons work 100%, and they are not that
> We're reviewing several hardware offers now, production simulations
> start in the next few months, so I could assume the remaining hitches
> in the
> assembly code and hardware specs are sorted out before then... ;-)
Apparently IBM have started shipping 90nm versions of the PPC970, so
there are rumors Apple will release faster G5 machines very soon. A
dual 2.6GHz G5 would be a pretty nice machine - 64-bit, huge memory
bandwidth, and about as fast as Itanium2 (faster than Xeon or Opteron).
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