Re: Multiple gpu cards

From: Axel Kohlmeyer (
Date: Wed Aug 15 2012 - 09:54:10 CDT

On Wed, Aug 15, 2012 at 4:24 PM, Dr. Eddie <> wrote:
> Hi all,
> Does anyone know if multiple gpu cards for namd need to be SLI'ed?

no they don't. they'll be treated as individual devices.
in most cases, people attach multiple cpu cores to
the same GPU to get better utilization of the GPU.
however, there is a limit to that. adding more GPU
devices, should thus give you better performance,
unless you run into some other bottleneck, like
lack of PCI bandwidth or too few atoms and thus
too few work units to parallelize over.


> If so is there a benefit or drawback. I'm putting in a second gtx590 and
> want to know the best configuration for namd. One of the cards will be
> driving a display as well if that makes a difference (I can't find room
> otherwise).

> Thanks,
> Eddie

Dr. Axel Kohlmeyer
International Centre for Theoretical Physics, Trieste. Italy.

This archive was generated by hypermail 2.1.6 : Mon Dec 31 2012 - 23:21:55 CST