From what I gather from discussions around here Titans do work for us locally, except for the fact that a big portion of them apparently contain some kind of fault, for which reason we don't buy any more of them.

This is the first I've heard of a GTX Titan "fault".

I'm sure Nvidia would be surprised to hear that as well.

If that was true why is it that GPUGrid is pretty much the only Nvidia GPU CUDA project that the Titan cannot run (out of all the available Nvidia GPU CUDA projects)?

I have contributed to DistR Gen, Einstein, Enigma, and now F@H successfully with hardly any issues at all relating to the GPU processing of the WU using the Titan(s).

However, everytime I try to run either a long or short GPUGrid WU it fails.

Please do not now try to claim that there is a fault in every GTX Titan as the rationale behind a lack of support for this hardware. It borders on the disingenuous.

Operator

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It might be a CUDA problem as well.
Einstein@Home for example have issues running their tasks on CUDA 4 and 5. All their attempts to run BRP fail there, so they stick with CUDA 3. Apparently nVidia has acknowledged this problem, but haven't provided a fix since a few years... CUDA 3 might be the reason why Titan runs there.
So the problem here might be a mix of acemd + CUDA 4 + GK110 hardware.

In another distributed app, once we decreased the ram speed (3GHz -> 2.5GHz) everything was fine. (mersenne LL testing, FFT/memory intensive)

Problem being Titan is one of the few vid cards with ram modules on the alternate side of the board where there's no fan/cooling. Also Titan's thermal limit seems to be a lot lower than other nvidia cards. Need to keep it under 80degC (as measured via GPUz). I currently have my machine open with a floor fan pointed at it :)

I'm currently running Milkyway on mine. My dual Titan machine is currently 6th:

http://milkyway.cs.rpi.edu/milkyway/top_hosts.php?sort_by=expavg_credit&offset=0

It might make 5th.

-- Craig

I'm currently running Milkyway on mine. My dual Titan machine is currently 6th:

http://milkyway.cs.rpi.edu/milkyway/top_hosts.php?sort_by=expavg_credit&offset=0

It might make 5th.

-- Craig

Your runtime (160-230 secs) per MW task are quite high. My 7950 does it in 25-32 secs.

How many simultaneous tasks do you do?

I do 8 on each Titan to keep GPU usage at 100%

-- Craig

I'm running only 1 WU per GPU to maintain reasonable temperatures (summer is coming here). I tried to run 2 which was sufficient to load the GPU at 100%, but it was running too hot, so I need to improve cooling.
How long does a single WU take on Titan?

Funny enough, 1WU takes the same amount of time as 8. @1WU GPU usage was 12.5% approx.

-- Craig

Funny enough, 1WU takes the same amount of time as 8. @1WU GPU usage was 12.5% approx.

-- Craig

That's easy to explain - MW@H has OpenCL apps only and nVidia GPUs just perform very weak there. If they would have a CUDA app, the performance boost would be huge.

Currently my dual HD7950s do about 570K PPD on MW@H, which I think is quite close to your dual Titans.

In another distributed app, once we decreased the ram speed (3GHz -> 2.5GHz) everything was fine. (mersenne LL testing, FFT/memory intensive)

-- Craig

I think it has nothitg to do with memory on titan. It only transfers or hides the problem.

I have done tests with genefer prime search on primegrid and the same kind of problem occurs on my 580, which was ok (moved to another pc and worked ok). And on my titan also.

But the same problem, I think, is on tesla k20 with ecc memory.

IMHO problem is somewhere between card-pci-cpu or cuda related.

I also recommend msi afterburner or similar sw to change fan speeds to higher rate to cool down card better than default.

I'm looking forward to other users opinions and experiences.

Zdenek

I do not think that will be a problem of heat or frequency, Titan automatically changes the speed according to the GPU load, if double precision mode is activated, the Titan running at 823 Mhz. Folding@home it in turns between 954 MHz and 967 MHz depending on the type of unit Folding calculated.
Under GPUGRID units go on miscalculation from the first second. I managed to calculate and validate units with my Titan for the following projects

Collatz, 
 DistrRTgen, WCG HCC GPU, 
 Moo!, 
 Einstein, 
 MilkyWay, Seti Beta,
Folding@home

Why miscalculations GPUGRID?

@+
*_*

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On GPUGRID there is not support for titan yet.

I'm guessing only:

1. gpugrid app is linked with cubin code, so version for CC35 cards is not included yet. In opposite to ditrrtgen which is linked with ptx code.

2. I'm not sure if CUDA4.2 supports CC35 cards (CUDA 5.0 yes but it's another story).

3. There may be other related problems with new CC (conditional compiling etc.)

Zdenek

In the News thread, Gianni said supporting the Titan and GTX780 will require the application to be updated,
Titan and GTX780 support

Looks like they will do this after they get hold of a GTX780, so they can facilitate both cards, which are similar, but quite different from the GTX770 (which is basically a GTX680 in a different box, and shouldn't need any app development, if the rumors are correct).

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FAQ's

HOW TO:
- Opt out of Beta Tests
- Ask for Help

I installed Boinc 7.1.1 Windows X64 for my TITAN,

http://boinc.berkeley.edu/dl/?C=M;O=D

And I received Gianni units, but there is always the same problem, GPUGRID displays error calculation from the first second calculation.

@+
*_*

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Again:

On GPUGRID there is not support for titan yet.

TITANS is the best four?



@+
*_*

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Wonder why the SLI isn't hooked up? We should find out the prices for the GTX780 and GTX770 tomorrow, if the 780 is less than $600 US, I might pick one up. I realize a lot of you guys still have kids at home and house/car payments but I don't, I guess I'm an old fart with no bills.

If I do upgrade, I'll just give away my GTX670's to anyone who wants them but only to folks here at GPUGRID.

No need for SLI, the person doing this card 4 Folding calculations in the same time.

That's very impressive. What application are we looking at here? Is that a custom skin for BOINC? With 4 Titans running full tilt in 1 machine must require a pretty beefy power supply, I wonder how many watts he's pulling at the wall?

That's very impressive. What application are we looking at here? Is that a custom skin for BOINC? With 4 Titans running full tilt in 1 machine must require a pretty beefy power supply, I wonder how many watts he's pulling at the wall?

It's FAH (Folding at Home)(not BOINC). The PS is an Enermax Platimax 1200W or 1350W (8 PCIE connectors), or even could be a 1500W (10 connectors). I wonder about the cooling, don't see evidence of water cooling on the GPUs and there's no room for air flow.

I wonder about the cooling, don't see evidence of water cooling on the GPUs and there's no room for air flow.

No he's strictly on air there, and that's the way it looks when they are installed.

I have two and there isn't much of a gap for airflow but it does work and seems to automatically limit itself to around 80C no matter what you're doing.

So, I'm probably going to end up water cooling mine this summer.

But first I'm going to wait for GPUgrid to come up with something for my Titans to munch before I jump into the water.

Operator

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