[gmx-users] some hardware questions

[Szilárd Páll]

On Fri, May 4, 2012 at 8:58 PM, Oliver Stueker <ostueker at gmail.com> wrote:

> Hi all,
>
> This week Nvidia has also announced the GeForce GTX 690 with two
> Kepler Chips [1].
> That will make a total of 3072 CUDA cores @ 915MHz to 1019MHz and will
> perform like two GTX 680s in SLI mode [2], but more energy efficient.
>
> I'd really be interested if parallelization would be a bottleneck for
> the Kepler chips compared to the Fermi ones. Has anyone already run
> some benchmarks on Kepler?
>

If you stick the GTX 690 into PCi-E 3.0, it should have a performance quite
close to 2x GTX 680 on PCI-E 2.0. Don't expect to gain more than 5% from
having GTX 680 on PCI-E 2.0 vs PCI-E 3.0.

Cheers,
--
Szilárd



> Best,
> Oliver
>
>
> [1]
> http://nvidianews.nvidia.com/Releases/NVIDIA-Unveils-GeForce-GTX-690-Dual-Graphics-Card-Combines-World-s-Fastest-Gaming-Performance-With-Sleek-Sexy-Design-7c1.aspx
>
> [2] http://www.geforce.com/whats-new/articles/article-keynote/
>
> On Wed, May 2, 2012 at 10:16 AM, Peter C. Lai <pcl at uab.edu> wrote:
> > On 2012-05-02 06:13:04PM +0200, Mirco Wahab wrote:
> >> Hello Peter,
> >>
> >> Am 02.05.2012 17:44, schrieb Peter C. Lai:
> >>
> >> > You can wait for ivy bridge, then stick some Kepler GPUs (nvidia gtx
> >> > 680) in it. That should max the performance. asm is pretty much
> stagnant
> >> > for general purpose procs since core2 came out.
> >>
> >> Is this true?
> >>
> >> To my knowledge, the Fermi GPU (GF-110, eg. GTX-580) is
> >> a 16 processor (streaming multiprocessor, SM) system, each
> >> processor having 32 cores running at 1.5 GHz, and the
> >> Kepler-1 (GK-104, eg. GTX-680) an 8 processor system
> >> with 192 cores per processor at 1GHz.
> >> Because on the Fermi each SM has more L1 cache than
> >> each SM on the Kepler-1 and because it might be harder
> >> to saturate 192 cores in a compute-scenario, I'd expect
> >> the 580 (GF-110) to be significant(?) faster in the
> >> next Gromacs (4.6). Maybe somebody tested this already.
> >>
> >> (Here in Germany, I can by GTX-580/3GB for ~325€ + Tax.)
> >>
> >> Regards,
> >>
> >> M.
> >
> > You might be. I do have a collaborator in France who chooses to use GTX
> 580
> > with NAMD and is eschewing the Keplers. I think I saw a bench somewhere
> > for Kepler compute; not sure if I saw that much difference (but you will
> > be paying the price though). In that case stick with Fermis for now :)
> --
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