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Overclock reset issue

post #1 of 5
Thread Starter 
So I recently picked up a Galaxy GeForce GTX 460 768mb GC to play around with. I managed to push a reasonably healthy overclock on it, to 877/1754 core/shader and 2100 Memory at stock volts. Ran it through stability tests using Kombustor, Heaven, folding@home, blah blah blah. Seems fine.

Everything seems good, with my fan profile, the card runs about 61C max under full load (even running prime95 to try to heat up the case), so no real heat issues per se. Great, time to game.

Both in Starcraft II and Rift Beta, two games which don't necessarily push the card to its utmost limits, but do push it reasonably hard, after a varying amount of time the game will slow or stutter for a second, and then my FPS will drop noticeably.

Checking Afterburner it seems the stutter was the card resetting its clock speeds. Sometimes it just resets to factory default (700/1400 & 1848), which allows me to still push up OC again, but sometimes it even drops down to lowpower3d values (400/800 & 1848) and gets stuck there till I reboot.

This same thing happened to me with my GTX 260, which is part of the reason why I upgraded actually, as it was annoying. So seeing as this has happened with two cards when OC'ing I was wondering whether this is an NVidia problem or possibly a problem with my system. I suspect it might be a PSU issue, as the 500W earthwatts is supposedly hovering around its max output with all the overclocking I've done (for either card).

Any thoughts though on the matter are appreciated, as I don't necessarily want to just run out and buy a $100 PSU on the offhand chance that's the problem.

EDIT: I tried bumping up the volts using inspector with similar results.
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post #2 of 5
The card locking to 405 shader clock until you reboot (with acceptable temps) means the clocks are too high or the voltage is too low. You either need to drop the clocks, or give it a lot more than a little bump in voltage. I would also leave the mem clock at 2000 max.
 
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post #3 of 5
Thread Starter 
Hmm ok, well considering the low temps I'm running at, I'm happy to try bumping the volts up a bit to see what's what, is there any guideline to what safe overvolting is like? Should I keep it under a certain value range or? Default Volts seem to be 0.962V with a software max of 1.087V
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post #4 of 5
I would try to stay under 1.087v. That shouldn't be too hard to do. Just increase the voltage in the smallest increments possible until you are able to play your games without the card locking itself down.

I've never owned a 460, but 877core and 2100 mem looks a little ambitious. You may end up crashing even with max Vcore. At that point it would be time to lower the clocks.
 
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post #5 of 5
Thread Starter 
Quote:
Originally Posted by theonedub View Post
I would try to stay under 1.087v. That shouldn't be too hard to do. Just increase the voltage in the smallest increments possible until you are able to play your games without the card locking itself down.

I've never owned a 460, but 877core and 2100 mem looks a little ambitious. You may end up crashing even with max Vcore. At that point it would be time to lower the clocks.
Well ambitious is what OCN is all about right?

Anyway, I did a little checking and it looks like the reference voltage for 460 768mb is actually .987 so for some reason default ships under volted. I popped it up to .987 and so far 875 / 2100 seems stable. Thanks for the suggestion of poppin up volts, I think I baby my hardware too much, that's why it's always still in like new condition years later when it's obsolete :laughter:

I'll try to hit 900 at some point with more volts, but for now I think I've hit the sweet spot.
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