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Why does nothing happen when I increase power target to 110%? (GTX 960)

post #1 of 4
Thread Starter 
I have an EVGA GTX 960 SC.

In MSI Afterburner (and EVGA PX), when I increase the power target to 110%, there doesn't actually seem to be more power being delivered to the GPU. May I know why is this the case?

For example, when running benchmarks, I see that I am throttling due to hitting power limit (the power % is roughly at 100%). This is corroborated by Power being the PerfCap reason in GPU-Z.

So logically I increase power limit to the max, 110% in my case. But, there is ZERO impact. Clocks do not increase, power usage % remains the same, temps do not see an increase etc.

Then I do the reverse. I drop power to 90%. Instantly I see lower power usage %, lower clocks and lower temps.

I then downloaded the BIOS of my GPU and checked it using Maxwell Bios Tweaker II. And it shows, my 100% power target as 128 watts (matches EVGA's rating) and 110% as the max at 141 watts.

So the allowance is there in the cards BIOS. But why is increasing the power limit via either of MSI AB or EVGA PX not working? Can someone please hazard a guess?

Thanks!
post #2 of 4
Have you enabled voltage control / overvoltage?

Power (watts) = Volts x Amps

If your volts and amps have a maximum setting, your watts cannot go any higher. You can set the power limit to 100000% but if the voltage or amps don't change, the power won't either.
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Ol'Faithful
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post #3 of 4
Thread Starter 
Quote:
Originally Posted by spinFX View Post

Have you enabled voltage control / overvoltage?

Power (watts) = Volts x Amps

If your volts and amps have a maximum setting, your watts cannot go any higher. You can set the power limit to 100000% but if the voltage or amps don't change, the power won't either.

What you said above would hold true if for example, my power was maxing out at 95% when I use the default 100% power limit. So obviously, in that case, unless I increased voltage, nothing at all will happen if I put my power limit higher by 10% to 110%.

Now, my issue is that, I am already hitting the 100% power limit. Yet still, putting it to 110% does nothing and I still hit the power limit at 100%.

A very simple test is this. Increase your power limit (to whatever value you please). Now, run Furmark. Monitor the power usage, and you will see that it would correspond to the new limit.

However, in my case, be it the default 100% or increased to 110%, I still max out at 100% (and I do not have any system bottlenecks such as CPU).
post #4 of 4
Welcome to OCN. Please fill put your rig in your signature so we can better help you. Are you sure the card is capable of going past stock draw? Although MSI afterburner may think it's possible, perhaps it is something that has a lock.
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