Hi JJ, > On 24 Apr 2015, at 03:02, Jingjie Yeo (IHPC) <ye...@ihpc.a-star.edu.sg> wrote: > > Hi Carsten, > > In this case of 2 x GTX980, as far as I can tell, the clock speed and GPU ram > is significantly lower. For simulations of more The GTX 980s have a clock rate of about 1200 MHz, whereas the clock rate of the Tesla K40 is 732 MHz. The latter has more CUDA cores, however. A rough estimate on how well the GROMACS short-ranged kernels perform on a card is the product of clock rate and CUDA cores. In this metric, the GTX 980 is slightly better than the K40. In addition, the GTX 980 also has the newer Maxwell generation chip, yielding somewhat higher performance due to better instruction scheduling.
The amount of GPU memory is almost never an issue with GROMACS unless you want to run enormously large MD systems. The largest system that we benchmarked had 12 million atoms and this was using 1.2 GB of GPU memory, so you could even run a couple of these on a 980. In our tests with a 2 million atom system on a node with 2x E5-2680v2 processors, using two 980s resulted in a 14% increased GROMACS performance when compared to using two K40s. Note that from the money you save by buying GTX instead of Tesla cards you can get another node to run another simulation on :) Carsten > than a million atoms, would it be advisable to go for more cores or more > clock speed, or having both is the best case scenario? > > JJ > > -----Original Message----- > Date: Thu, 23 Apr 2015 08:03:46 +0000 > From: "Kutzner, Carsten" <ckut...@gwdg.de> > To: "gmx-us...@gromacs.org" <gmx-us...@gromacs.org> > Subject: Re: [gmx-users] Optimal GPU setup for workstation with > Gromacs 5 > Message-ID: <fe42569f-159b-49b1-a644-86a866aaa...@mpibpc.mpg.de> > Content-Type: text/plain; charset="us-ascii" > > Hi, > >> On 23 Apr 2015, at 08:03, Jingjie Yeo (IHPC) <ye...@ihpc.a-star.edu.sg> >> wrote: >> >> Dear all, >> >> My workstation specs are 2 x Intel Xeon E5-2695v2 2.40 GHz, 12 Cores. I >> would like to combine this with an optimal GPU setup for Gromacs 5 running >> simulations with millions of atoms. May I know what are the recommended >> setups? My vendor proposed doing a dual K40 Tesla GPU setup, would that be >> optimal? > I would propose to put two GTX 980 into that machine instead. > This will give you the same GROMACS performance at a fraction of the price. > > Carsten > >> >> Best Regards, >> JJ >> -- >> Gromacs Users mailing list >> >> * Please search the archive at >> http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! >> >> * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists >> >> * For (un)subscribe requests visit >> https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a >> mail to gmx-users-requ...@gromacs.org. > -- > Gromacs Users mailing list > > * Please search the archive at > http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! > > * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists > > * For (un)subscribe requests visit > https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a > mail to gmx-users-requ...@gromacs.org. -- Dr. Carsten Kutzner Max Planck Institute for Biophysical Chemistry Theoretical and Computational Biophysics Am Fassberg 11, 37077 Goettingen, Germany Tel. +49-551-2012313, Fax: +49-551-2012302 http://www.mpibpc.mpg.de/grubmueller/kutzner http://www.mpibpc.mpg.de/grubmueller/sppexa -- Gromacs Users mailing list * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists * For (un)subscribe requests visit https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a mail to gmx-users-requ...@gromacs.org.
