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Geforce 1080 Ti w/ no overclock hitting power limit?

post #1 of 10
Thread Starter 
Good day everyone,

First post on these forums.

Just recently built my first PC in a vary long time and was working on overclocking my GPU, which is a new experience for me.
I seem to be hitting a barrier though.
Even with my voltage and power settings maxed I am regularly hitting the power limit without any overclocking and cannot figure out what it is I am doing wrong. Reference picture below.

Any advice?

Thanks

post #2 of 10
I am not sure what the problem is here.
You have the card's power setting and fans maxed and the card is boosting up to it's stock limit.
You have also told the card to prioritize the power target of 120% and it's doing just that.

Sounds like everything is doing what it's told to do.

Unless I'm missing something.


Here is what I am doing with my card.

More power is not always the answer.

Edited by Machiyariko - 10/20/17 at 10:09pm
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post #3 of 10
Thread Starter 
The only fathomable far reaching thing I can think of (and I have no idea how it could affect this) is I did also try MSI afterburner before to maybe somehow some old settings from that are messing with it? I did restore default values and delete it before I started with this program though...
post #4 of 10
You are running way too much voltage.
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Ishimura
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post #5 of 10
Thread Starter 
Quote:
Originally Posted by ZealotKi11er View Post

You are running way too much voltage.

Ahh that helped alot! Thank you.
post #6 of 10
Thread Starter 
I got it all relatively stable with regards to the Power limit. Then decided to drop my Core Clock a little to give myself some wingle room at which point the power limit ran away from me for some strange reason.

In any case, does the Power limit matter as long as the Core Clock is stable?

post #7 of 10
Quote:
Originally Posted by Machiyariko View Post

I am not sure what the problem is here.
You have the card's power setting and fans maxed and the card is boosting up to it's stock limit.
You have also told the card to prioritize the power target of 120% and it's doing just that.

Sounds like everything is doing what it's told to do.

Unless I'm missing something.


Here is what I am doing with my card.

More power is not always the answer.

if you dont mind me asking but why would you turn the power down 25%? wouldnt that keep it from applying the overclock if it cant actually get up to 100%? or do i not really understand how the power target actually works
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post #8 of 10
Here is my thought on lowering the power on my card:

Most 1080ti cards max out around 2000-2100. If the temperature gets too high the card will downclock, typically every 5c will drop the clocks 50mhz or something.
So in my case lowering the power usage of he card will lower the temps and hence increase the average clock speed.

I can still overclocking the card a bit, mine maxes out at +75. So at 75% power my max temperature is about 65c vs almost 80c at 100%.

Here are two scenarios:

100% power at 2000mhz 80c @ 45% fan speed / audible fans = 90fps in FFXIV for example
75% power at 1900mhz 65c @ 30% fan speed / inaudible = 85fps in FFXIV for example

Which would you pick?
It's not always about "MOARPOWER!" But I always find it fun to test things like this out.
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post #9 of 10
Stock power limit isn't enough for max boosts

If you want to run unthrottled then power usage should stay below the power limit which you should set as high as you want to deal with. It's a ceiling, not a target.

at a 75% limit it will throttle deeply but the efficiency gains are huge going to 100% or 75% power compared to trying to maintain boost+OC clocks around 120-130%.

Quick test on Witcher 3 with no clock offsets i'm at:

~1740mhz with 75% limit
~1940mhz with 100% limit
~2000mhz unthrottled (peaks above 120%)

In practice this is like a 1.12x performance loss and 1.44x perf/watt gain so worth it for some people
Edited by Cyro999 - 11/11/17 at 9:28am
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post #10 of 10
Here is a fixed fan scenario which is the best use case for 75% power.
These tests are on my open test bench with +75 core and +500 memory.

An open bench is the worst case scenario for this test, In a closed case these temps and clocks would be much more negatively affected.
Also these are just single runs, an hour long test would give much more meaningful results.

Superposition benchmark runs:

75% power @ 30% fixed fan speed
1873Mhz @ 62c
Score: 9398 @ 4K
Min 56 / Avg 70 / Max 89

80% Power @ 30% fixed fan speed
1860Mhz @ 68c
Score 9510 @ 4K
Min 56 / Avg 71 / Max 90

85% Power @ 30% fixed fan speed
1896Mhz @ 73c
Score 9644 @ 4K
Min 57 / Avg 72 / Max 92

90% Power @ 30% fixed fan speed
1911Mhz @ 74c
Score 9763 @ 4K
Min 57 / Avg 73 / Max 93

95% Power @ 30% fixed fan speed
1936 Mhz @ 76c
Score: 9910 @ 4K
Min 58 / Avg 74 / Max 94

100% power @ 30% fan speed
1949Mhz @ 78c
Score: 10014 @ 4K
Min 59 / Avg 75 / Max 96

117% power @ 30% fan speed
1949Mhz @ 83c
Score: 10039 @ 4K
Min 59 / Avg 75 / 97

In the end we lose 4% clock speed 7% fps and drop 34% in temperature from 75% power to 117%.

When you want a quieter card this is something to try out.
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