Hi Ross,
Thanks very much for the test results. :) In my case I do not believe the
temperature is an issue. "homebrew" gaming cases usually have equal or
better air cooling than server cases if configured correctly IMO, because
gamers are ridiculously OTT about these things and it all comes down to the
design & placement of fans in the case. I use monitorix to graph the
temperatures of the system at all times and it shows the following maximum
temperature thresholds for the following components when the system is
under full load. i.e. 4xZotac 780, 1x17 CPU going for it:
GPU's = max 80 degrees C (when there are 4 loaded)
CPU = max 50 degrees
mb = 30 degrees.
What are the temperatures that you get for the components in the EXXACT
cases?
I'm starting to firmly believe that the Zotac card you have got there is
working and will pass all the cellulose NPT tests with no problems, similar
to the 1 working zotac that I have. However, if you tested a whole load of
Zotac's a number would pass and a number would fail due to differences in
the manufacturing process. The only way to find out is if someone with more
of the Zotacs tests them.
On 12 July 2013 16:53, Ross Walker <ross.rosswalker.co.uk> wrote:
> Hi All,
>
> Ok, so overnight I repeated the JAC NPT tests on the two 4 x GTX780
> machines I have access too. One of these has:
>
> http://tinyurl.com/prxlwy6 Zotac GTX780 ZT-70201-10P
>
>
> and the other has:
>
> http://tinyurl.com/k3n2rqb EVGA GeForce GTX780 3GB GDDR5 384bit, Dual-Link
> DVI-I, DVI-D, HDMI,DP, SLI
> Ready Graphics Card (03G-P4-2781-KR)
>
>
> BOTH machines are super micro motherboards in certified cases with
> validated and ducted cooling. One is rack mount and the other is a desktop
> - essentially the models shown here:
> http://exxactcorp.com/index.php/solution/solu_list/65
>
> I ran JAC NPT with the following input:
>
> Typical Production MD NVT
> &cntrl
> ntx=5, irest=1,
> ntc=2, ntf=2,
> nstlim=1000000,
> ntpr=1000, ntwx=5000,
> ntwr=100000,
> dt=0.002, cut=8.,
> ntt=1, tautp=10.0,
> temp0=300.0,
> ntb=2, ntp=1, taup=10.0,
> ioutfm=1,
> /
>
> AMBER 12 with all the latest public updates
>
>
> nvcc: NVIDIA (R) Cuda compiler driver
> Copyright (c) 2005-2012 NVIDIA Corporation
> Built on Fri_Sep_21_17:28:58_PDT_2012
> Cuda compilation tools, release 5.0, V0.2.1221
>
>
> NVRM version: NVIDIA UNIX x86_64 Kernel Module 319.17 Thu Apr 25
> 22:45:49 PDT 2013
> GCC version: gcc version 4.4.6 20120305 (Red Hat 4.4.6-4) (GCC)
>
> Running on CentOS / RHEL 6
>
>
> I ran 10 sequential runs on each of the 4 GPUs in each machine
> simultaneously giving me a total of 80 output files all of which were
> identical and ended after 1 million steps with the following output:
>
> NSTEP = 1000000 TIME(PS) = 2006.000 TEMP(K) = 300.01 PRESS =
> -47.5
> Etot = -58245.9096 EKtot = 14421.9385 EPtot =
> -72667.8481
> BOND = 486.0307 ANGLE = 1238.6417 DIHED =
> 972.1042
> 1-4 NB = 558.3709 1-4 EEL = 6793.5638 VDWAALS =
> 8465.9200
> EELEC = -91182.4793 EHBOND = 0.0000 RESTRAINT =
> 0.0000
> EKCMT = 6392.4186 VIRIAL = 6633.3942 VOLUME =
> 234849.5754
> Density =
> 1.0218
>
>
>
> So right now the GTX780s look ok to me but it is very possible that they
> don't work well in traditional consumer cases.
>
> I am going to repeat the tests with Cellulose NPT.
>
> 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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> http://lists.ambermd.org/mailman/listinfo/amber
>
On 12 July 2013 23:18, Marek Maly <marek.maly.ujep.cz> wrote:
> Yes of course,
>
> it was just my reaction on some recent Titan overheating hypothesis
> in connection with Ross hypothesis about his "super-cooled" working GTX
> 780s versus
> some GTX 780 from Amber users which do not work properly in spite the
> fact that they are of the same type ZOTAC ...
>
> Anyway my opinion is also that Titan/cuFFT issue is rather a bit more
> complicated
> that simply memory/(some other GPU parts) overheating problem.
>
> BTW, the latest Scott's info about some preliminary optimistic cuFFT
> results with Titans
> with downclocked memory and also with heatsink seem promising although no
> Amber tests
> were probably done with such modified GPUs yet.
>
> So OK let's wait,
>
> Best,
>
> Marek
>
>
>
>
>
>
>
> Dne Fri, 12 Jul 2013 22:50:55 +0200 <tec3.utah.edu> napsal/-a:
>
> >
> >> Hi Ross,
> >> would be interesting if you can do the same test
> >> with Titan GPU using the same super-cooled machines
> >> as you are using for testing of GTX 780 but perhaps, you
> >> or Scott already tested Titans in such machines or it was some
> >> normal consumer cases ?
> >
> > I think Ross and Scott have been extremely clear on this in the
> > incredible
> > volume of e-mail that has come through this list on this topic. There
> > clearly is a cuFFT problem and also Titan's hardware is also suspect. I
> > would guess the skepticism of Scott and Ross will be apparent regardless
> > of whether or not you immerse the cards in liquid N2...
> >
> > 99.5% likely a Titan hardware issue:
> >
> > http://archive.ambermd.org/201306/0007.html
> >
> > Continuing to push the AMBER developers will not make things move faster,
> > and perhaps could make them move even slower. Patience please as we wait
> > on nVidia to see if a cuFFT fix can emerge and better probe these issues.
> >
> > When Ross and Scott know, I am sure they will inform the list...
> >
> > --tec3
> >
> > _______________________________________________
> > AMBER mailing list
> > AMBER.ambermd.org
> > http://lists.ambermd.org/mailman/listinfo/amber
> >
> > __________ Informace od ESET NOD32 Antivirus, verze databaze 8559
> > (20130712) __________
> >
> > Tuto zpravu proveril ESET NOD32 Antivirus.
> >
> > http://www.eset.cz
> >
> >
> >
>
>
> --
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Received on Fri Jul 12 2013 - 21:00:02 PDT
