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GTX 670 Strange OC Behaviors

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More than likely im guessing i didnt get that great of a card. its a gigabyte gtx 670 2gb. i have a very small kepler boost of around 35mhz. im trying to find my max core overclock using evga precision x and heaven benchmark. i set the voltage to max (1.175) and power target to max (112%) so far all my monitoring charts are completely straight when benchmarking. my temps never go over 55C and my power target is always below 80%. everything other than my kepler boost seems fine. im able to add +111 to the core which gives me about 1201mhz max core. but when i take it to +121, heaven crashes even though all my monitoring charts are stable. i have no idea why it would crash when everything seems to be running fine. im using latest drivers (310.70).

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Graphics card Master

awhiteguy said:
How am I at my max oc with only 1200 core and less than an 80% power target. Isn't there something else I can do to bring it higher? Nothing is throttling


Wait do you have your power target SET to 80%? Because if so, you need to increase that to over 100%.

Anyways, your chip at some point just won't be able to clock any higher on air cooling, and it's not really predictable where that point will be - it doesn't necessarily have anything to do with what power target it can achieve.
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BigMack70 said:
Wait do you have your power target SET to 80%? Because if so, you need to increase that to over 100%.

Anyways, your chip at some point just won't be able to clock any higher on air cooling, and it's not really predictable where that point will be - it doesn't necessarily have anything to do with what power target it can achieve.

Power target is set to 112% and there isn't any problems with my air cooling because I'm never even close to 60c
Graphics card Master

Yeah it just sounds like you're at your max OC. Your maximum OC is not the clock at which your chip hits a certain power usage or temperature level... your maximum OC is when your card starts crashing at any clock speed above <x> level, which is where it sounds like you're at.

Another similar example: both of my Lightnings allow me to increase voltage up to 1.3V. However, my maximum OC on both cards is found around the 1.22V level. Now, at first glance that may seem wrong - it would make sense that further increasing voltages would allow for higher clock speeds. But that's just not how overclocking works - your chip just eventually won't clock any higher on air cooling.

BigMack70 said:
Yeah it just sounds like you're at your max OC. Your maximum OC is not the clock at which your chip hits a certain power usage or temperature level... your maximum OC is when your card starts crashing at any clock speed above <x> level, which is where it sounds like you're at.

Another similar example: both of my Lightnings allow me to increase voltage up to 1.3V. However, my maximum OC on both cards is found around the 1.22V level. Now, at first glance that may seem wrong - it would make sense that further increasing voltages would allow for higher clock speeds. But that's just not how overclocking works - your chip just eventually won't clock any higher on air cooling.

But the only reason for water cooling is better temps and temps are the least of my problems right now. How about using the Kepler golden bios mod?
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awhiteguy said:
But the only reason for water cooling is better temps and temps are the least of my problems right now. How about using the Kepler golden bios mod?


If your temps were lowered by a noticeable amount, your chip might be stable at a higher clock.

I think you're just learning some standard overclocking lessons the hard way... overclocking always depends on luck of the draw with your chip and sometimes you get a chip that just isn't going to overclock well.

In any case, the Kepler cards aren't great for serious overclocking since you don't have any real voltage control over the cards :( 
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