Indeed, it sounds like a problem with the card. Did you already power off, remove the power card for 10 minutes and try again?
I did/have not.
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You could also cross-swap the GTX760 with e.g. your GTX770 to check the system & software. This way you wouldn't need a spare PC. And if the error travels with the card we know it's the card.
I have not had any invalids within the last 2~3 days. I did lower my concurrent GPU jobs of this type to 2 but the invalids continued. Now they have stopped. If it continues w/o invalids I will ramp back up to 3 then to 4 concurrent jobs and see if the problem reoccurs. If the problem does reoccur then I will do the suggested "swap" to see if problem follows the card.
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Has it gotten hotter recently where you live? I know you said the temperature is fine, but chips age when run under load. If the chip has degraded so far that at stock clock it's borderline unstable, a temperature increase from e.g. 60°C to otherwise perfectly fine 70°C may be enough to push it past the stability boundary. Lowering the GPU clock speed slightly, as suggested by archae, would help in such cases.
The weather here has gotten hot. All PCs are under air but the ambient room temp has climbed. I installed the fan slider on all Linux PCs and run at ~74%. The keeps the temp at around 64C. Quite warm but the only other "good" option would be to shutdown for the summer. The hottest weather is yet to come.
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And generally the new app pushes the GPUs harder, which might make a card fail that was apparently fine with the old app.
RE: Indeed, it sounds like
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I did/have not.
I have not had any invalids within the last 2~3 days. I did lower my concurrent GPU jobs of this type to 2 but the invalids continued. Now they have stopped. If it continues w/o invalids I will ramp back up to 3 then to 4 concurrent jobs and see if the problem reoccurs. If the problem does reoccur then I will do the suggested "swap" to see if problem follows the card.
The weather here has gotten hot. All PCs are under air but the ambient room temp has climbed. I installed the fan slider on all Linux PCs and run at ~74%. The keeps the temp at around 64C. Quite warm but the only other "good" option would be to shutdown for the summer. The hottest weather is yet to come.