Hello !
I am currently running 77x-SANTI_MARwtcap310-1-32-RND1129_0
Unité de travail (WU) 4985773.
First time I see this, but the GPU charge (graph) is sinusoidal.

Instead of being stable at 98 % or 99 % :

X seconds at 50 % or less, followed by Y seconds at 99 % etc

=> after 13 hours on a GTX660Ti : 91 % only, while this card
normally takes between 10 up to 12 hours to completed long runs.

Any idea about the origin of this "strange" behaviour ?

Thank You, Kind Regards,
Philippe

If by 'charge' you mean power then it should be linear or very close to it.
If it's a square-toothed graph then it's likely that something else is interfering with GPU crunching, the GPU itself, or there might be something wrong with the WU.
Sinusoidal, as in sine wave (http://people.sc.fsu.edu/~jburkardt/latex/svd_2006_vt/inout_flow_sinusoid.png) would be very odd!

What software are you using to view the graph?
What else are you crunching and what Boinc settings are you using?

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Thank you for your message.
After a reboot, thinks look fine now.
However, this UT took much more time to complete ... (WU) 4985773

http://www.gpugrid.net/result.php?resultid=7540482

Yes, the GPU charge indicator (EVGA Precision X) showed
a sinusoidal use i/o linear ...

Made neither change to the PC nor to BOINC ...

Posted this message as this was the first time I saw such behaviour ...

GPU = GTX660Ti - PNY

Again, Thank You

Kind Regards

Philippe

I think by GPU charge he means GPU utilization rather than something electrical. My French is not very good but I think charge can mean something like usage or utilization in French.

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BOINC <<--- credit whores, pedants, alien hunters

That tool can show a graph of electrical power consumption for the card. Even if clock stays the same(and I really mean the same - no boost or "idle" freq drop), but there is no compute load on the card, the power consumption will drop - seems like a good indicator of how busy the card is at a given moment.

That tool also can dynamically boost Memory and compute clocks - if memory load is small, it drops it's clock and can boot compute up to 1058 for Titan (from 836 advertized or 928 "official" boost).