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 Thu Jun 27 2013 - 13:30:02 PDT
