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Increase Powertune limit with 7950/7970 - Page 2

post #11 of 24
Quote:
Originally Posted by Ganf View Post

Watercooled, and this time of year I'm running below 20c at full load. Watts only equals computational power assuming they are being used. If all they're doing is generating heat because more flops are being wasted due to bad calculations as the card is pulling more watts than it can handle, then why provide them?
Oh, you won't see 20c in these screenshots, it's unseasonably warm at 80 degrees this week. But it's better this way, because it helps prove my point.


Pay no attention to the FPS. OCCT bounces all over the place when I'm switching between programs to take screens. The important thing is 0 errors on both shots, OCCT picks up on them immediately. I could run heaven and 3dmark 11 and show you the same thing, but it'd be a waste of time. The only significant difference I see between 10% and 20% power line boost is about 35 watts and 4 or 5 degrees celcius average.
So why burn the coal if you don't have to?

how do you determine whether or not you should increase or decrease power control?
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post #12 of 24
By overclocking the way you're supposed to overclock. tongue.gif

Start at stock settings, and bump the clocks up until you start to see artifacts. Only then do you bump up the voltage and the power limit, and just enough to stop the artifacts, before you start increasing the clocks again. Voltage will almost always eliminate the artifacts, power line will only get you that last little bit and you only need to bump it up until you no longer notice any problems. Anything beyond that is pointless.

Your clock speeds are what crank out the frames, not the watts.
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post #13 of 24
Quote:
Originally Posted by Ganf View Post

By overclocking the way you're supposed to overclock. tongue.gif
Start at stock settings, and bump the clocks up until you start to see artifacts. Only then do you bump up the voltage and the power limit, and just enough to stop the artifacts, before you start increasing the clocks again. Voltage will almost always eliminate the artifacts, power line will only get you that last little bit and you only need to bump it up until you no longer notice any problems. Anything beyond that is pointless.
Your clock speeds are what crank out the frames, not the watts.

do you use the beta 12.11 drivers? Do they work with MSI Afterburner now?
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post #14 of 24
Quote:
Originally Posted by Ganf View Post

To what end? Pulling more watts doesn't always mean better clocks. My card performs better at +10% than +20%. Wiggle that slider around, you might find a sweet spot.

Quote:
Originally Posted by robnitro View Post

I don't get it.... how is it performing better with the TDP throttling at a lower setting? Are you running temps below 80 C at 20? Is the oc stable, or is this at stock?
Watts= computational power, provided you are comparing at the same frequency and voltage.

The post above is the way I see it. I can OC my card higher with less. 1300/1800 on air with up to +5 works fine (just as well at +0), higher makes it less stable.
    
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post #15 of 24
I don't use Afterburner because it can be fiddly, and I had problems with it randomly forgetting my overclock. I use Trixx, as you see in the screenshot. And I use the 12.11 drivers yes.
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post #16 of 24
Thread Starter 
That is surprising... I don't get how setting +20% power limit could change anything. I don't know the way it has been designed but it shouldn't do anything more than limiting the power usage hence the skepticism.
I will dig this up and check out it can affect my overclock. Not saying you are wrong but I am surprised tongue.gif
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post #17 of 24
different names for the same thing, all you're doing is adjusting the maximum amount of amperes drawn by the card. It only has an effect if your card isn't getting enough juice, and does nothing if it's not already starving.
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post #18 of 24
Quote:
Originally Posted by Just a nickname View Post

That is surprising... I don't get how setting +20% power limit could change anything. I don't know the way it has been designed but it shouldn't do anything more than limiting the power usage hence the skepticism.
I will dig this up and check out it can affect my overclock. Not saying you are wrong but I am surprised tongue.gif

I don't know what Power Setting does for sure....but I'll say that I had funny results. I OC'd to 1150/1500 with a Powertune Setting of +0 with a very minor gain in Kombustor. I then bumped up the Powertune setting (same OC values) to +20 and my FPS in Kombustor nearly doubled.
 
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post #19 of 24
Quote:
Originally Posted by victorzamora View Post

Quote:
Originally Posted by Just a nickname View Post

That is surprising... I don't get how setting +20% power limit could change anything. I don't know the way it has been designed but it shouldn't do anything more than limiting the power usage hence the skepticism.
I will dig this up and check out it can affect my overclock. Not saying you are wrong but I am surprised tongue.gif

I don't know what Power Setting does for sure....but I'll say that I had funny results. I OC'd to 1150/1500 with a Powertune Setting of +0 with a very minor gain in Kombustor. I then bumped up the Powertune setting (same OC values) to +20 and my FPS in Kombustor nearly doubled.


Powertune is a limiter, much like redline in a car. What its limiting is the max TDP of a card, how much power in wattage the card can draw upon to perform X task. Raising Powertune on its own doesn't do much, but if you are overclocking, the act of raising clocks equals the need for drawing more power. Thus generally, raising Powertune is a good thing if you're overclocking. That said there are situations where it doesn't help as much as it should like some of the instances written above.
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post #20 of 24
Quote:
Originally Posted by tsm106 View Post

Powertune is a limiter, much like redline in a car. What its limiting is the max TDP of a card, how much power in wattage the card can draw upon to perform X task. Raising Powertune on its own doesn't do much, but if you are overclocking, the act of raising clocks equals the need for drawing more power. Thus generally, raising Powertune is a good thing if you're overclocking. That said there are situations where it doesn't help as much as it should like some of the instances written above.

Kinda makes sense. I just figured that it would crash if Powertune wasn't set high enough. Now, if we could set Powertune to +900%....would it effect anything? If it's a limiter, setting the limit lower would lower our OC settings, right? But let's assume the case mentioned earlier where Powertune set to +10% doesn't "bottleneck" the OC. Why would increasing the limiter to +20% make it hotter if it doesn't increase the OC? Does that make sense, or am I crazy?

Translated to Redline in a car: If my car tops out at 5500RPM, changing the Redline from 8500 to 6500 shouldn't change anything....right?
 
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