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GTX 1080 founder edition (all brands), voltage locked? - Page 2

post #11 of 13
Quote:
Originally Posted by Guinsoona View Post

Have you tried whether the voltage is unlockable in your 1080's bios?

it doesn't matter, voltage adds very little to pascal oc and can destabilize it on certain situations
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post #12 of 13
Thread Starter 
Why is that? Do you have any source so I can do a little more research?

Edit: Nevermind, I found a great article explaining the pros/cons of over-volting.
Quote:
Hardware itself is well capable of getting to that and above voltage output for GPU core, but GP104 chip itself now more sensitive to voltage, than even previous Maxwell generation. Part of it due to thinner physical process, other part due to challenges removing heat from all those tightly packed 7.2B transistors quick enough from 21% less surface area. Those overclockers who did 2200+ MHz on GTX 980 Ti’s are well aware of all things required to achieve those high clocks. Same principle applies to Pascal generation. So if you can manage to keep GPU cooled well and have good voltage delivery to it, you indeed can push higher voltages. Cards cooled by liquid nitrogen during this guide testwork were able to run 1.35-1.4V, reaching speeds over 2500 MHz.

Fact that GTX 1080’s capable of reaching 2.1GHz on aircooling without any modifications confuse lot of people, making them to think that these chips can overclock well past 3GHz on liquid nitrogen cooling. But it’s still silicon, with similar architecture, so reality is bit sour. Yes, it allow to get good performance without extreme cooling, but hides the fact that LN2-cooled 980Ti is still much faster than overclocked GTX 1080 due to more shader cores and better CPC performance.

This also brings and answer to the question if overvolting can help OC on aircooling or watercooling. It does not help, due to thermal, which get only worse. Higher temperature render stability and performance decrease. GPU literally overheats and cannot run high frequency anymore, even though temperature is below specified maximum temperature +94°C. Think of it as temperature to frequency dependency, all the way down from +94°C to -196°C, with slope around 100MHz every 50°C. So just like in 980/980Ti/TitanX case, over-voltage on aircooling/watercooling is not recommended, as it gains little if any performance improvement.

Don’t get this message wrong, as GTX 1080/1070 are still great cards for daily gaming/content creation and VR experience. They are fast, not power hungry, moderately cool. The only catch is that overclocking them is not as fun and rewarding as it was on previous generations, even considering all tricks involved to get Maxwell clock high.

As usual, any feedback and questions are appreciated. Feel free to share link to this guide, but keep links and references intact, as guide likely to be updated in future.

Source: https://xdevs.com/guide/pascal_oc/
Edited by Guinsoona - 6/16/16 at 4:24am
post #13 of 13
Sounds like you're more limited based on power limit rather than actual voltage... if your hitting a throttle wall its definitely power limit... But it could also be not just the power limit in the bios, there could be some underlying power values that are choking off the power and limiting the clocks, PCI rail power, 12v rail power, etc...
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