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660 Ti throttles itself for no apparent reason

post #1 of 17
Thread Starter 
My single 660 Ti PE/OC throttles itself for no apparent reason. With or without OC. In a new clean installation of Win 8 or Win 7.

When I run a benchmark or a game for 20 min. everything seems to work. The GPU-Z says that the card works @1130(boost 1294MHz)/1800MHz and the temps are 58ºC, TDP 96~98% but suddenly the FPS drops 50-60% (from 40 to 17 FPS) and GPU-Z says all is correct, same MHz, same temps, same gpu load, mem load, ecc... BUT the TDP is on 65~70%

From this point I must reboot to have the same performance as before the TDP drop. From GPU-Z log, I can see the TDP never rises over 98.7%, temps max 59ºC. No matter if the card is overclocked, downclocked or at stock. Every 20-30 min. this happens.

Any idea?
post #2 of 17
Did you try to reinstall the drivers?
   
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Frappenstein
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post #3 of 17
What is your power usage at? Did you increase the power target? Also use Precision or Afterburner to check the clocks.
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post #4 of 17
Thread Starter 
I use/reinstalled diversous versions of Afterburner. I've set +114% (and later +110%) on power limit.

I've tried to reinstall diversous versions of the drivers (also last beta) but always do the same.

My power usage (I think consumption) never rises above 98.7% TDP.

Very confused doh.gif
post #5 of 17
gtx 600 cards slows down as it gets hotter. You need a better case.
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post #6 of 17
Thread Starter 
Quote:
Originally Posted by Alienware69 View Post

gtx 600 cards slows down as it gets hotter. You need a better case.

I don't think so. My card is at 58ºC on full load Unigine Heaven/Valley @Extreme HD. After 20/30 minutes of usage (minimal like a game from 2003) the TDP drops and the performance of the card is 50-60% worse...
post #7 of 17
I had this issue once with a 470. Never found the cause but it wasnt thr gpu. Try different drivers.
post #8 of 17
set your power target to +135% and leave it there, as long as you are under 70deg C you shouldn't throttle
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post #9 of 17
Thread Starter 
Quote:
Originally Posted by mtbiker033 View Post

set your power target to +135% and leave it there, as long as you are under 70deg C you shouldn't throttle
The Max power target for my card is +114% I can't go higher...

I've reinstalled Windows 7, no another driver or program installed, just nvidia drivers (314.21) + evga precision + unigine valley + GPU-Z and now, when the gpu thorttles itself I can see a spike in the TDP, it goes from 98% to 296%, what the heck?weirdsmiley.gif
post #10 of 17
Thread Starter 
I've modded the bios and now I've +121% but the problem continues...
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