This is a bit of a hardware question, but I guess its on the right place here. If not a moderator may move it.
I built me a new rig last week and seeing a few things.
I had a 770 in an AMD fx8350 on a Sabertooth MOBO.
My new one has an i7 4471 on a Sabertooth MOBO as well (not the same type off course). And with the same WU's (if they are really the same) the 770 is around 3000 seconds faster on the Intel.

Secondly I put a GTX780Ti in as the primary GPU and this one is around 3000 seconds faster than the 770.

I installed all hardware and software from the box, did no tweaking and let it run. Checking with GPU-Z I saw that the 780Ti went quickly to 85-87°C, what I don't like so I used GPUTweak from Asus to make a change. I have set the GPU Temp Target to 75°C and left the Power Target to 100%. Did nothing with clock speeds. Set fan to user define and made that it run more. Now I see:

The 780Ti:
GPU Core CLock:966.6MHz
GPU Memory Clock: 1752.8MHz
Temperature: 75°C
GPU Load: 80-81%
Power Consumption: ~74%
PerfCap Reason: Limited by temperature limit (I understand as I set that)

The 770:
GPU Core Clock: 1045.2MHZ
GPU Memory Clock: 1752.8MHz
Temperature: 63°C
GPU Load: 94%
Power Consumption: ~69%
PerfCap Reason: Limited by reliability voltage (I don't understand)

The 780Ti is from Asus and has 1 fan, the 770 is also from Asus and has two fans.
When I set the temperature limit to 85°C, then the GPU load doesn't change but the card operates at 82-83°C.
Question: how can I get the 780Ti to operate around 90%? Or is ~80% its maximum with Santi WU's?
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Greetings from TJ

I think the clue is here:

PerfCap Reason: Limited by temperature limit (I understand as I set that)

...The cards are said to take almost 2000 MHz, but overclocking is an obvious risk.

The GPU Memory clock is 7012MHz. This is (was) standard I did not touch that setting at all. Is that okay?
I have now set the fan higher and the GPU Temp Target to 69°C, to see it that works. Currently still at 81% GPU Usage.

Tried already to stop all CPU tasks, but didn't help. Now only 4 WU's (Docking) are running on the CPU.

The PC is now running for 3 days and 7 hours. The graphics of Asus GPUTweak are no gone, empty, only the grid. But the values at the right side change. Is this normal of a bug from Asus?

Let it run overnight and look in the morning again.

Thanks so far.
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Greetings from TJ

Letting the 780Ti run overnight at 69°C resulted in an GPU load of 82-83% but the GPU Core Clock went to 885MHz.
I have now set maximum temperature to 70°C and GPU Core Clock is running at 901.4MHz, with GPU Load of 81% steady. Perhaps this 81-83% is the maximum for this card for Santi's as ETA suggested.
The VDDC is 1.0250V for the 780Ti and 1.160V for the 770 according to GPU-Z. Do I need to change anything there?
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Greetings from TJ

Something is hindering the performance of your GTX 780 Ti. I guess that it's the Win7 WDDM overhead.
For comparison:
I163-SANTI_bax2-6-32-RND6602_0 24460s (6h48m) (your Win7 host)
I203-SANTI_bax2-4-32-RND8709_0 16905s (4h42m) (my WinXP host)
These are not some specially selected running times, I have similar running times for this kind of WU on my host, and you have similar running times on yours (so I'm not comparing my best running time to your worst.) According to these numbers, my GTX 780 Ti is 44,7% faster under WinXP (6 SIMAP CPU tasks are running) than yours under Win7. (our CPUs are almost the same, as I have an i7-4770k@3.5GHz)
My GTX 780 Ti is running at 1110 MHz, temp: 65°C, GPU load: 96%, VDDC: 1.15-1.20V, Memory controller load: 26%, (while crunching 167x-SANTI_MAR423cap310-1-32-RND5480_1)

Thanks for your replay Zoltan.
Indeed I have checked my times with other 780Ti's and that is why I started this thread. My 770 is almost as fast as the 780Ti and that can't be.

You have you card way cooler running then I. Can you please advise me what I need to change? What program are you using to alter the settings?

What is the Win7 WDDM overhead? And if, how can I change that?

Your replay is highly appreciated as always.
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Greetings from TJ

You have you card way cooler running then I. Can you please advise me what I need to change? What program are you using to alter the settings?

What is the Win7 WDDM overhead?

And if, how can I change that?

I think this WDDM overhead could impact faster cards more than slower cards, as a faster card will complete a piece of calculation faster, but the WDDM overhead of every interaction with the OS takes the same time either for a slower or faster GPU, and the number of interactions is (almost) the same for every GPU (slower or faster) while crunching a given WU. So for example the total time of the calculations on the GPU is X, and the WDDM overhead is Y, then the total running time is X+Y. If you use a twice as fast GPU, the total time of the calculations will be X/2, but the WDDM overhead stays Y, so the total running time will be X/2+Y. If the X/Y ratio is high, the total running time won't be affected by Y too much, so the running time could be reduced (almost) in direct proportion by using a faster GPU, but I'm afraid, that the GTX 780 Ti (and the GTX 770) is too fast, so the X/Y ratio is not high enough to have linear decrease in the running times (on Win7) by using a faster card. The Maxwell chips will have their own dedicated ARM CPU on chip to eliminate this bottleneck.

At the moment I have a fan speed of 82% and 70°C with Asus GPU Tweak.

When using MSI Afterburner I can not find my second card to alter things.

If I go for default setting, the GPU Boost Clock displays 982 MHZ but operates at 876 MHZ, the temperature goes to 82°C and fan duty to 60%.
GPU Load stays at 81%. So the default is not helping me.

Do you have a second card in this system Zoltan?
As I have the 780Ti in the first slot and the 770 in the second. There is about 2 centimeters room in between. The 770 (with two fans, stays cool at 61°C.
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Greetings from TJ

Just a notice.
I was my cards a bit tweaking, core clock little higher to 1045MHz (not nown if related) but all of a sudden screens went black and system boots,, with message Windows didn't close correctly.
Checked with WhoCrashed and it was a Bad Pool Header from nVidia Windows kernel driver 331.82.
After boot and everything running again, one Noelia (was 98% before crash) finished correctly, the other a Santi was 54% done, not as it started new again.
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Greetings from TJ

Do you have a second card in this system Zoltan?

As I have the 780Ti in the first slot and the 770 in the second. There is about 2 centimeters room in between. The 770 (with two fans, stays cool at 61°C.

Just a notice.
I was my cards a bit tweaking, core clock little higher to 1045MHz (not nown if related) but all of a sudden screens went black and system boots,, with message Windows didn't close correctly.
Checked with WhoCrashed and it was a Bad Pool Header from nVidia Windows kernel driver 331.82.
After boot and everything running again, one Noelia (was 98% before crash) finished correctly, the other a Santi was 54% done, not as it started new again.

I have nothing changed at the 770, but set the voltage of the 780Ti to 1.175mV and the Boost Clock to 1110MHz. The Power Target still at 100% and the Temp Target to 70°C and let it run overnight.

According to GPU-Z the Core Clock is running at 875.7MHz, the GPU load is ~78% and Power Consumption is 57.8%. The temperature is 67°C (which I like). The PerfCap Reason is now GPU utilization.
It does now LR's in less than 7 hours. So it made a good contribution to the project.
Could it be better, if I give it little more voltage and set the core clock lower or have I already screwed up the settings?

GPU-Z has more sensors for the 770, 4 about voltage, and 1 of VRM Temperature.
I don't see this with the 780Ti and the 660. Is the 770 special?


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Greetings from TJ

There is 4 slot space between the back of the GTX 670 and the "glass" of the GTX 780 Ti's cooler. It's about 9 centimeters.

I have made the settings of the 780Ti the same as for the 770 but the clock stays operating at 875MHz.

Finally I got a Noelia on the 780Ti and now the GPU load is 91%, while on the Santi's it is ~80% but also with the Noelia the clock stays 875MHz.

Mostly Zoltan has good advise but as he runs XP, he has a more capable OS then I with Win7. Perhaps someone with Win7 and a 780Ti can help me or give some more info to steer the 780Ti to a higher GPU load on other tasks than Noelia's or perhaps it is not possible with a 780Ti and is the "to fast" for Windows?
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Greetings from TJ

Hello Zoltan,

I have found how I get my cards BIOS into the Kepler BIOS Tweaker.
If you have time (as your own problem is sort out) would you please:
1. let me know which values you have changed?
2. how then get the new cards BIOS into the card?

Thanks for you help as always.
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Greetings from TJ

Hi TJ!

I have found how I get my cards BIOS into the Kepler BIOS Tweaker.
If you have time (as your own problem is sort out) would you please:
1. let me know which values you have changed?

2. how then get the new cards BIOS into the card?

Thank you Zoltan.

I have changed all settings too with MSI Afterburner, GPU Tweak (from Asus) and EVGA Precision X.
I thought the 780Ti would be a lot faster then a GTX 770, but it is only ~3000 seconds faster, on Win7.
Your card is about 7000 seconds faster then mine due to XP.

What I would like to achieve is to be that the 780Ti is a bit faster. I will try Linux but don't have not a lot of confidence yet.

If you have some tips/idea's I could try. I would be grateful.

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Greetings from TJ

I thought the 780Ti would be a lot faster then a GTX 770, but it is only ~3000 seconds faster, on Win7.
Your card is about 7000 seconds faster then mine due to XP.

What I would like to achieve is to be that the 780Ti is a bit faster.

I will try Linux but don't have not a lot of confidence yet.

If you have some tips/idea's I could try. I would be grateful.

Hi Zoltan,

You are right again :)
Indeed I have tried all I could and got the core clock steady at 980MHz, even managed to get it to 1045, but the GPU load is around 74% with Santi's, and 10% higher with Noleia's and Nathan's.

I will start experimenting with Linux first, and wait with investment in new cards until that works smooth or the Maxwell's arrive.
Your advice was of great help.
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Greetings from TJ

With the Noelia FXArep WU's my 780Ti is approximately 5000 seconds faster than a Santi WU on Windows7!
So it is not only the WDDM that slows down the card of cards it is also a bit of programming. Noeilia does that great. The 780Ti runs at 82% reaches 85% GPU load at times (Santi only 77%) and at 72-74°C.

With Win7 I can use the iGPU for Einstein with Linux an iGPU is useless at the time (if I have read correct).
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Greetings from TJ

Hi I have this graphics card running on Windows 8.1 64 bit, Gigabyte GeForce GTX 780 Ti WindForce 3X OC.
All tasks short or long in Seconds after the initiation of counting ,they fall .. I have the latest drivers,update, etc. ..
The same problem I have also another type of BOINC projects on 55 cuda. Other boincprojects going on 50 cuda working normally.
interesting is the second PC where there are 3 Nvidia GTX 680, the basic version, not OC versi. These work normally while. also the same windows and drivers.
What to do to give me my 780 Ti start counting tasks.?

Hi I have this graphics card running on Windows 8.1 64 bit, Gigabyte GeForce GTX 780 Ti WindForce 3X OC.
All tasks short or long in Seconds after the initiation of counting ,they fall .. I have the latest drivers,update, etc. ..
The same problem I have also another type of BOINC projects on 55 cuda. Other boincprojects going on 50 cuda working normally.
interesting is the second PC where there are 3 Nvidia GTX 680, the basic version, not OC versi. These work normally while. also the same windows and drivers.
What to do to give me my 780 Ti start counting tasks.?

@TJ: on POEM, folding@home and possibly other projects the complete 331 / 332 driver branch is significantly slower than the previous version, we're talking about ~15% here. That's why I'm "still" using 327.23. Not sure if this one already supports GK110 on GPU-Grid. If so you might want to give this one a try. I haven't read anything about similar driver problems here, but I have been busy otherwise the last months or so.
MrS