Re: no. of CPUs for optimal GTX-690 performance

From: Ajasja Ljubetič (
Date: Tue Nov 06 2012 - 13:43:28 CST

It is possible that the problem lies in too little PCI-e bandwidth. I'm
guessing you're still using PCI-e 2.0?

Best regards,

On 6 November 2012 20:01, Michael Purdy <> wrote:

> Hello, I am running NAMD simulations (multicore-CUDA) on a ThinkPad with
> dual Core i7-2760QM CPUs and a Quadro 2000M running Debian. For a 150k atom
> system I get performance like this:
> Benchmark time: 4 CPUs 0.287062 s/step 1.66124 days/ns 387.641 MB memory
> Benchmark time: 7 CPUs 0.289229 s/step 1.67378 days/ns 428.574 MB memory
> Things are going well so we purchased a GTX-690 which we installed in a
> workstation with two dual core Opterons, which is evidently far short of
> the CPU cores we need to get the most of the 2 GPUs and 3072 cuda cores.
> Performance was just slightly better than the ThinkPad:
> Benchmark time: 4 CPUs ~0.2 s/step ~1.4 days/ns
> We would like to build a new workstation to get the most out of the
> GTX-690 and I'd like to know how many CPU cores we need. I'm considering
> two Core i7-3930k (6-core/12-thread) or two Xeon E5-2650
> (8-core/16-thread). Will either of these be a good match for the GTX-690 or
> will I still be short running short on CPUs? The current plans is to build
> this on an Asus Z9PE-D8 WS board.
> Michael

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