It's not really a question of how it's programmed, it's a question of
manufacturing. One picks 12 out of 15 processor cores on the chip itself
to make a GTX 780 as opposed to picking 14 out of 15 processor cores to
make a GTX Titan. In the former, there are 455 ways to do so and in the
latter, 15.
On Wed, Jun 26, 2013 at 7:13 PM, ET <sketchfoot.gmail.com> wrote:
> Thanks very much for the quick information guys! It's much appreciated.
>
> I'm not that up on the manner in which these cards are programmed, so am a
> little confused by your explanation Scott. could you please clarify it for
> me?
>
> br,
> g
>
>
> On 27 June 2013 01:47, Scott Le Grand <varelse2005.gmail.com> wrote:
>
> > To clarify, there are 15 SMXs in a GK110 GPU. For GTX Titan, one of them
> > is disabled. There are 15 (15 choose 1) ways to do this. All of them
> seem
> > to be broken.
> >
> > There are 12 out of 15 active SMXs in GTX 780. That means there are 455
> (15
> > choose 3) ways to make one. I'm a little nervous that some of those
> > configurations may be broken, so the best thing to do is to test if they
> > exhibit deterministic behavior upon acquiring them, and if they don't,
> RMA
> > them as defective.
> >
> >
> >
> >
> >
> >
> > On Wed, Jun 26, 2013 at 4:31 PM, Ross Walker <ross.rosswalker.co.uk>
> > wrote:
> >
> > > Hi All,
> > >
> > > Ok, good news on the GTX780 front. After 4 days of testing neither
> Scott
> > > nor myself have been able to break the GTX780s. This is in a 4 x GTX780
> > > Exxact system although at present we have only tested multiple single
> GPU
> > > runs using all 4 GPUs at once - I.e. pmemd.cuda (NOT pmemd.cuda.MPI) -
> I
> > > will be testing pmemd.cuda.MPI shortly but I don't see why this
> wouldn't
> > > work given single GPU is working fine.
> > >
> > > Key though is that there are multiple ways to build GTX780s, and for
> now
> > > we have only tested one specific model which is as follows:
> > >
> > > http://tinyurl.com/prxlwy6 Zotac GTX780 ZT-70201-10P
> > >
> > >
> > > Until we have an opportunity to test different vendor GTX780s and OC
> > > versions the advice is to stick with the above model if you can.
> > >
> > > All the best
> > > Ross
> > >
> > > /\
> > > \/
> > > |\oss Walker
> > >
> > > ---------------------------------------------------------
> > > | Associate Research Professor |
> > > | San Diego Supercomputer Center |
> > > | Adjunct Associate Professor |
> > > | Dept. of Chemistry and Biochemistry |
> > > | University of California San Diego |
> > > | NVIDIA Fellow |
> > > | http://www.rosswalker.co.uk | http://www.wmd-lab.org |
> > > | Tel: +1 858 822 0854 | EMail:- ross.rosswalker.co.uk |
> > > ---------------------------------------------------------
> > >
> > > Note: Electronic Mail is not secure, has no guarantee of delivery, may
> > not
> > > be read every day, and should not be used for urgent or sensitive
> issues.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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Received on Thu Jun 27 2013 - 11:00:02 PDT
