my GTX 560 Ti seems to have underclocked itself?!?

[Sunny129]

like the title says, my GTX 560 Ti is currently running @ 405mhz core/810mhz shader/324mhz VRAM/30% fan/35°C. no more than 30 minutes ago it was running at stock clocks (900mhz core/1800mhz shader/2106 VRAM/30% fan/53°C)...i know those aren't "reference" clocks, but they are factory clocks - its an EVGA factory OC'ed model. at any rate, its been running fine 24/7 for ~2 weeks now. as you can see cooling isn't a problem, nor was it when the cards was running at the stock clocks (i'm cooling it with an AC Twin Turbo II). i monitor the vitals w/ MSI Afterburner, but have not (and probably never will) OC or overvolt the card. i've been crunching Einstein@Home BRP4 CUDA tasks on it since i got it, and they've been taking ~72 minutes on average to finish. i have yet to report any tasks that have run entirely under the reduced clocks, but the ones that were running when the clocks unexpectedly dropped look like they're going to take in the neighborhood of 150-165 minutes to finish. and i suspect that any tasks that run entirely at the reduced clocks (if i haven't fixed the problem by then) will take closer to 180 minutes, or 3 hours, to finish...

might anyone have an idea why my card has underclocked itself, even though its set to a profile in MSI Afterburner that matches the factory specs?

TIA,
Eric

 

[nitromullet]

I had a GTX 275 a while back that would down clock if the current clock speeds were unstable. It wouldn't artifact or anything, just down clock. Try re-booting to see if the clocks reset to where they are supposed to be, and if it keeps lowering the clock speeds it's possible the card can't handle the factory OC.

 

[Sunny129]

well a reboot seems to have fixed it...should be interesting to see if it does it again considering it ran solid 24/7 for 2 weeks @ 900mhz core/2106mhz VRAM. thanks for the advice...i know its something i should have thought to try to begin with. it just seems very strange that the card can't handle the factory OC as cool as it stays under an ~85% GPU load 24/7.