Question About undervolt on a GTX 1080

I just received my 775 with the GTX 1080 But the temperature while gaming bounces between 90 and 91c I want to undervolt With afterburner I tried to watch a couple tutorials But I don’t understand how you’re supposed to come up with a proper curve. Any advice would be greatly appreciated thank you.


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You have to move the curve in the same shape back along the voltage axis.

 

You can cap the maximum turboboost voltage and raise core offset which goes a long way to pascal not wastefully overvolting itself with turboboost 3.0

Below is what a voltage cap looks like on my 1070s unit (where it was needed due to a crash bug if either card boosted over 1.013V) - what you see here is an undervolt (1.062V -> 0.95V) and overclock (1860ish -> 1975mhz) compared with stock

I have done this on my 1080s as well, about a +150 core offset up to 1.043V or ~2000mhz

 

OK thank you so much I guess I was on the right path last night the CPU I got the offset down to -149 with throttle stop and at that point it no longer froze up. Playing around with the curve on afterburner I was able to get it to 1911@ 925 on the graph I was messing with the curve while playing with pub G in the background and at that point it would run Fine anything below that and the game would crash. I suppose it worked because it went down from 91c to 81c But what I don’t understand is how do you guys check to see that you’re at the point where You’re getting maximum cooling But not at the point where you are losing performance?

But again thank you so much!


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Just like with CPUs, test your undervolt with the heaviest workload to ensure maximum stability.

With all overclocks, it costs more voltage and power for each increase in frequency. Have a look at derbauer's chart for Ryzen 2.



The x axis is voltage which is not ideal but the takeaway is as you head upwards the performance scale, the red and green level off and the blue rises more steeply the further things head to the right.

Each 100mhz costs progressively more volts and power than the last. Higher wattage basically translates to higher temps and higher fanspeed. It's up to you where you end up but 81C is a lot better than 91C.

Whether or not the changes result in changes in performance will come from benchmarking. I reckon you'll see very little difference between stock and your 'undervolt' settings, since at stock you would have been temp throttling (which drops clocks hard), and you're gaining effective power headroom from the lower voltage and then using it with the higher core frequency.

 

Moving away from 90C will tend to help your GPU clock stabilise which can help frame times too.