Hi, Performance in single precision on Tesla cards is often lower than on GTX cards. The only reason to buy Telsa cards is double precision, reliability and fanless cards for clusters.
I have a GTX 660 Ti, which is much cheaper than a GTX 670, but should have nearly the same performance in Gromacs, as we are not limited by memory bandwidth. Cheers, Berk ---------------------------------------- > Date: Fri, 25 Jan 2013 08:34:03 +0300 > Subject: Re: [gmx-users] Re: On the choosing of GPU for MD runs > From: [email protected] > To: [email protected] > > Szilárd, > > > thanks for suggestions. > > IT's only not quite understand for me in what GPU ( gtx or tesla) I'll > get best performance with the typical ssystem consisted of 50-80k > atoms with explicit solvent and PME ( assuming that I'm using small > cut-offs as you told). For example on the 400$ gtx 670 I have > performance similar to your at the GTX 680. I't intresting to me is > there any reason to buy modern tesla card ( which prise is > 2000$ ) > > > James > > 2013/1/25 Szilárd Páll <[email protected]>: > > On Mon, Jan 14, 2013 at 7:20 PM, James Starlight > > <[email protected]>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 <[email protected]>: > >> > 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 [email protected] > >> 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 [email protected]. > >> * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists > >> > > -- > > gmx-users mailing list [email protected] > > 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 [email protected]. > > * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists > -- > gmx-users mailing list [email protected] > 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 [email protected]. > * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists -- gmx-users mailing list [email protected] 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 [email protected]. * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists
