FYI: Just got 2x Zotac 780s and ran the benchmark tests.
All the tests were reproducible across 2x repeats.
Going to get a couple of more today.
br,
g
On 27 June 2013 21:43, ET <sketchfoot.gmail.com> wrote:
> no worries. :) Already RMA's 2x Titans and bought 2x Zotacs. Will check
> 'em tomorrow. If they are good will order another 2.
>
> Thanks again for testing them.
>
>
> On 27 June 2013 19:43, Ross Walker <ross.rosswalker.co.uk> wrote:
>
>> The GTX780s do not appear to be broken - we are just being cautious right
>> now.
>>
>> The Titan's are broken for everyone right now - well broken for anyone who
>> actually hits what they are broken with - which is still being
>> investigated. But certainly for anyone who uses cuFFT the Titan's appear
>> to broken right now.
>>
>> All the best
>> Ross
>>
>>
>>
>> On 6/27/13 11:20 AM, "ET" <sketchfoot.gmail.com> wrote:
>>
>> >Are they "broken" only in terms of AMBER? Or could this be classed as a
>> >general hardware fault pertaining to all applications that use the card?
>> >
>> >
>> >
>> >
>> >On 27 June 2013 18:50, Scott Le Grand <varelse2005.gmail.com> wrote:
>> >
>> >> 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 Wed Jul 03 2013 - 05:30:02 PDT
