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[WCCFTech]Radeon RX 480 Reducing Voltage and Increasing Efficiency

post #1 of 21
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Quote:
In the past this required the use of 3rd party applications like MSI Afterburner to take control of the voltage and power limit of the GPU core, but with the release of the RX 480 AMD has seen fit to toss out Overdrive in favor of their new WattMan software. No, no superhero but it is a super tool for the average Joe. Giving us access to several P-States and allowing us to manual set the voltages at the higher end of the performance target, we could potentially reduce the power draw of the GPU and still have the same effective performance.


Going into Wattman within Radeon Settings, we simply set the Voltage to manual control and adjust the final two P States down slightly.




It doesn’t take much with GPUs to be effective, but you can get experimental and maybe drop your voltages even lower. There have been reports of people lowering the voltages and getting better overclocking results over on reddit.
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We took the total system power draw from the wall using a Kill-A-Watt after running Unigine Valley for 30 minutes.




But none of this matters if we lose performance, because this entire point of this was to keep our performance but ditch some leakage and over use of power. So how did we come out? Not too bad, see for yourself.




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post #2 of 21
I recommend everyone who buys an AMD card to undervolt it from stock as much as possible regardless if you plan to overclock or not. Of course how far you can go depends on the silicon lottery, but you would be surprised how much voltage you can knock off.

My 380x can do .-03v from stock clocks (1040MHz) and I can do -.07v at 380x reference clocks (970MHz).
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post #3 of 21
The Semiaccurate article makes for a great summary, too. Best values are +10 and -20 percent in the PowerTune scale. [Source]

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post #4 of 21
AMD is going to implement something like this in new drivers.
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post #5 of 21
This guy was able to reduce the VDDC by 60mV without touching the clocks at all which is impressive but odd.



It seems from all of these tests that the stock power targets on 480's is overshot generally.
He shows a FireStrike run which improves the score slightly and it seems his consumption is not decreasing as linearly as it should which is kinda points toward the power bottleneck.

Maybe AMD expected lesser quality sampling and set the power targets and voltages to allow for headroom. It's also possible that there is a large range of quality at the moment being on a new process, some silicon which requires much less voltage and some which requires a lot more.
If that's the case this node should decrease consumption and increase efficiency by quite a lot after it's matured.
Edited by pengs - 7/2/16 at 2:24pm
post #6 of 21
It just speaks volumes to how volitile the power targets on the new process chips are. AMD had to do the same thing with bulldozer chips in the begining. My friend who purchased a FX-6100 at the begining of production couldn't undervolt his cpu and his stock voltage was much higher than that of my coworker and I who purchased FX-6100 chips nearer to the end of their product cycles. We both can overclock our chips and run at lower than stock volts while doing it as well.

The fluctuation on required voltage from one chip to the other must be quite high. This would explain why we're hearing of some decent overclocking chips in the whild as well. It doesn't surprise me coming from GloFlo though. Horrible company that has NEVER done AMD any favors.
Edited by nakano2k1 - 7/2/16 at 3:38pm
 
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post #7 of 21
Quote:
Originally Posted by nakano2k1 View Post

It just speaks volumes to how volitile the power targets on the new process chips are. AMD had to do the same thing with bulldozer chips in the begninig, My friend who purchased a FX-6100 at the begining of production couldn't undervolt his cpu and his stock voltage was much higher than that of my coworker and I who purchased FX-6100 chips nearer to the end of their product cycles. We both can overclock our chips and run at lower than stock volts while doing it as well.

The fluctuation on required voltage from one chip to the other must be quite high. This would explain why we're hearing of some decent overclocking chips in the whild as well. It doesn't surprise me coming from GloFlo though. Horrible company that has NEVER done AMD any favors.
It's a Samsung made 14nm.

From the little one can find online the 14nm Samsung and 16nm TSMC are same area size and when comparing some Apple chip that has been made using both the TSMC made ones were more effective power wise. So go figure.
Edited by JackCY - 7/2/16 at 3:25pm
post #8 of 21
Quote:
Originally Posted by JackCY View Post

It's a Samsung made 14nm.

From the little one can find online the 14nm Samsung and 16nm TSMC are same area size and when comparing some Apple chip that has been made using both the TSMC made ones were more effective power wise. So go figure.
14nm is 8-9% denser.
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post #9 of 21
you guys can check this thread
we did a lot of UVing there:

http://www.overclock.net/t/1603915/any-official-polaris-threads-coming-soon
post #10 of 21
Quote:
Originally Posted by AliNT77 View Post

you guys can check this thread
we did a lot of UVing there:

http://www.overclock.net/t/1603915/any-official-polaris-threads-coming-soon

Thanks! I'll definitely try this with may 480. redface.gif
 
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