On Mon, Jan 14, 2013 at 7:20 PM, James Starlight <jmsstarli...@gmail.com>wrote:
> 1)As I understood from nvidia site at present time GPU's from the > tesla serie are the best for the calculations like md. For instasnce > NVIDIA Tesla C2075 have performance ~ 1 TFLOPS in the > single-precission calculations. I wounder to know how many 8-core CPU > must have typical cluster to obtain such performance ? Have someone > tried to use tesla GPU with gromacs ? What real performance in ns\day > have been obtained with the explicit solvent systems? > > > 2) Today I performed test gpu-based calculation with 2 different gpu's > ( GTX 670 vs GT 640). Both of that gpu's have the same GPU frequency > but GTX 670 has 256 bit memory interface width with ddr5 ram worked on > higher frequency. As the result I've obtained 50% more perfomance with > the GTX 670. Does the memory interface width as well as ram frequency > affect on total GPU performance in addition to GPU frequency? > > As mentioned before, the memory does not matter as much as the number of processing cores on the GPUs and their frequency. - GTX 670: 1344 "CUDA cores" (7 multiprocessors * 192 cores) running at 915 Mhz. - GTX 640: 384 "CUDA cores" (2 multiprocessors * 192 cores) running at 900 Mhz. The raw GPU performance with our current algorithms has a roughly linear relationship with the number of cores and frequency, so the raw GPU kernel performance difference between 670 and 640 should be around 3.5x. It is a bit surprising that you've only got 50% higher total performance with the 670. -- Szilárd > James > > > > 2013/1/14 James Starlight <jmsstarli...@gmail.com>: > > Dear Gromacs Users! > > > > > > I wounder to know some detailes about choosing of the gpu for md with > > gromacs. In particular on what properties of the videoadapter should I > > pay most attention ? What modern gpu nvidia-series might give best > > performance (gtx 6xx, tesla or quadro series) ? Could you provide me > > with some bechmarks besides the information present on the Gromacs web > > ? > > > > For instance with the gpu Geforce GTX 670 + core i5 (4 cores) I have > > performance 10ns\day for explicit system with 67000 atoms ( protein in > > tip3p water). Have someone better results with common home-like > > desktop? :) > > > > > > James > -- > gmx-users mailing list gmx-users@gromacs.org > http://lists.gromacs.org/mailman/listinfo/gmx-users > * Please search the archive at > http://www.gromacs.org/Support/Mailing_Lists/Search before posting! > * Please don't post (un)subscribe requests to the list. Use the > www interface or send it to gmx-users-requ...@gromacs.org. > * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists > -- gmx-users mailing list gmx-users@gromacs.org http://lists.gromacs.org/mailman/listinfo/gmx-users * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/Search before posting! * Please don't post (un)subscribe requests to the list. Use the www interface or send it to gmx-users-requ...@gromacs.org. * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists
