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[Official] NVIDIA GTX 1080 Ti Owner's Club - Page 1455

post #14541 of 15837
Just like to confirm Bullzoid's suspicion with Pascal voltage affecting performance...

I have my Seahawk EK X locked to 2100.5MHz on cores and 12,420MHz and VRAM, then played with voltages:

Voltage - Firestrike Ultra Stress Test - Superposition 8K Run 1 - Superposition 8K Run 2
1.081v - Failed - N/A
1.100v - Passed - 4779
1.113v - Passed - 4789
1.125v - Passed - 4805 - 4804
1.131v - Passed - 4785

It seems my optimal voltage is 1.125v, which is confirmed with a Firestrike run netting 32,344 graphics score. It even beats 2177MHz / 12000MHz at 1.2v, which netted someting like 32,169 or so.
post #14542 of 15837
Quote:
Originally Posted by mouacyk View Post

Just like to confirm Bullzoid's suspicion with Pascal voltage affecting performance...
0.5% difference between min and max result? I'd say the suspicion is busted. You get more variance between successive benchmark runs, all the results are within margin of error.
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post #14543 of 15837
Quote:
Originally Posted by Alexium View Post

0.5% difference between min and max result? I'd say the suspicion is busted. You get more variance between successive benchmark runs, all the results are within margin of error.
The voltage tolerance on Pascal is much tighter than it was on Maxwell. Compared to overclocking my 980 TI, I noticed that it takes Pascal much sooner to discover an unstable overclock.

I will take your point that more runs are needed for better validation. However, I should note that my OS is stripped down to diagnostic mode (no non-native OS services) which should have minimized the possible variances by CPU.
post #14544 of 15837
Quote:
Originally Posted by mouacyk View Post

I will take your point that more runs are needed for better validation. However, I should note that my OS is stripped down to diagnostic mode (no non-native OS services) which should have minimized the possible variances by CPU.
Fair enough. My point is two-fold:
1) more data points are needed to reliably establish correlation between voltage and performance given such a small magnitude of variance;
2) the practical value of a 0.5% gain (or 0.25% on average) is not evident to me. I assume only hardcore / professional benchers should care enough.
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post #14545 of 15837
Quote:
Originally Posted by KedarWolf View Post

Run Nvidia Profile Inspector as Admin, turn 'Force P2 State' off. You'll have to hit Apply twice before it actually changes it.

Then set your memory clock, run the vRamBandWidthTest (unzip the file first of course).

I know when my bandwidth test jumps from 450-460 MB/sec to 480-490MB/sec at close to the same clocks speed (I move them up and down a bin or two until I see the change) I'm at optimal memory speeds. biggrin.gif

Thanks for this, didn't know there was an easier way to find the optimal memory overclock.
post #14546 of 15837
Coffee lake pushed my old 1080ti to a new level...
https://www.3dmark.com/3dm/22804284
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post #14547 of 15837
Quote:
Originally Posted by mouacyk View Post

Just like to confirm Bullzoid's suspicion with Pascal voltage affecting performance...

I have my Seahawk EK X locked to 2100.5MHz on cores and 12,420MHz and VRAM, then played with voltages:

Voltage - Firestrike Ultra Stress Test - Superposition 8K Run 1 - Superposition 8K Run 2
1.081v - Failed - N/A
1.100v - Passed - 4779
1.113v - Passed - 4789
1.125v - Passed - 4805 - 4804
1.131v - Passed - 4785

It seems my optimal voltage is 1.125v, which is confirmed with a Firestrike run netting 32,344 graphics score. It even beats 2177MHz / 12000MHz at 1.2v, which netted someting like 32,169 or so.

Is the MSI 1080ti Seahawk EK X, the same as a putting the EK 1080 ti TF6 waterblock on a MSI 1080 ti Gaming X ? In terms of actual card(pcb) and clocks are they identical ?
post #14548 of 15837
Quote:
Originally Posted by DStealth View Post

Coffee lake pushed my old 1080ti to a new level...
https://www.3dmark.com/3dm/22804284

What was your gpu score before? Looks like the cpu pushed the total score up. I like the other two scores, nice for a 6core.
    
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post #14549 of 15837
GPU was 200-300 point lower with 5820k@4.7 and 7800x@5055 but yes Physics and combined especially Combined is better than almost any other CPU paired with such clocked 1080ti does...biggrin.gif
Edit: Just checked HOF and my result is number 30 world wide for single card...there are also 2 8700k in front of me beating many 8-10 + Core CPUs Total scores thumb.gif
Edited by DStealth - 10/21/17 at 1:19am
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post #14550 of 15837
Something weird is going on with my 1080 Ti FE as I am trying to find stable overclock. Through trial and error, over the course of a week, I have established that 1999 MHz is stable at 1.025 V, 2025 MHz is stable at 1.0425 V, and 2038 MHz is stable at around 1.063. I've used this curve for the last 2-3 days with no issues. Been mostly playing Witcher 3 because it's just what I'm into these days, and it does seem to load the card better than many other games. But today the very same Witcher 3 game started crashing on me, and quite often / soon after I start it up. I've checked my curve. Then I've dropped one core clock step (12 MHz) on all voltage bins. Still crashing. Then I've dropped again and again. Now it finally seems stable at 1974 MHz / 1.025 V. This may not be the highest clock for this V / lowest V for this clock as I have not fine-tuned it too much, but you get the idea of how much I had to drop clocks that used to be stable yesterday.

Any idea what could be going on? Did anyone encounter such a phenomenon?

I'm fairly confident in my PSU as it's a brand new Corsair RM1000i, and the card is liquid-cooled by a full-cover waterblock. Th card is bone stock, I did not flash a different VBIOS or anything. Just some OC using Afterburner.
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