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1080 SLI overclocking?

post #1 of 16
Thread Starter 
I just got my 2nd 1080 and I can't understand how to get the cards overclocking properly. I am using afterburner and the voltages don't sync, so I can't get anything working stable. With my first card, I was hitting 2080mhz easily, by using the curve method of OC'ng. That doesn't allow the clocks to go any higher than 1987 no matter the setting I choose.

Then simply raising the core clock offset, raises it no problem, but then my first card that needed 1.081 to do 2080, is stuck at 1.031. How am I supposed to get the voltage up higher or in sync with both cards?

I've been googling and and OCng these cards in SLI seems to be a mystery. Cause no one seems to be talking about it.
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post #2 of 16
I tried and ended up giving up. My cards OC like complete garbage and one of them locks at +100MHZ above stock. I have the ASUS Founder's Edition. What are your results for your other card?
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post #3 of 16
Have had the same issue here. I have Strix A8G cards. I flashed them to the O8G BIOS they now run at 2025 on the OC profile. I can only get about +10 core out of them (roughly +100 from the stock BIOS) before they become unstable. Both cards on there own will go to 2088 stable but they crash on anything above 2025 in SLI. Go figure. rolleyes.gif I have come to the conclusion that I am lucky that I can get 2000 mhz out of them in SLI in everyday usage and will hope for better luck in the silicon lottery in the future.
post #4 of 16
Thread Starter 
Quote:
Originally Posted by HeyThereGuy View Post

Have had the same issue here. I have Strix A8G cards. I flashed them to the O8G BIOS they now run at 2025 on the OC profile. I can only get about +10 core out of them (roughly +100 from the stock BIOS) before they become unstable. Both cards on there own will go to 2088 stable but they crash on anything above 2025 in SLI. Go figure. rolleyes.gif I have come to the conclusion that I am lucky that I can get 2000 mhz out of them in SLI in everyday usage and will hope for better luck in the silicon lottery in the future.

Mine are basically the exact same. I am getting 2025 out of them right now... That's in SLI. Thankfully, for some weird reason, on it's own on single GPU games, it jumps up to 2063, so it's not all lost.

Not too far off the 25k mark... http://www.3dmark.com/3dm/15136993?
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post #5 of 16
Quote:
Originally Posted by Derko1 View Post

Mine are basically the exact same. I am getting 2025 out of them right now... That's in SLI. Thankfully, for some weird reason, on it's own on single GPU games, it jumps up to 2063, so it's not all lost.

Not too far off the 25k mark... http://www.3dmark.com/3dm/15136993?

Interesting that our graphics scores are quite different from the difference in memory..

http://www.3dmark.com/3dm/15145082?
Edited by HeyThereGuy - 9/29/16 at 9:19am
post #6 of 16
double
post #7 of 16
Thread Starter 
Quote:
Originally Posted by HeyThereGuy View Post

Interesting that our graphics scores are quite different from the difference in memory..

http://www.3dmark.com/3dm/15145082?

Wow... that is very interesting. Have you tried clocking it down and see if you get a better score? My memory is running at +526, are you able to match it?

My CPU is running at 4.8 ghz, but otherwise your CPU is better than mine. Which would not make much a difference in the graphics scores.
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post #8 of 16
This is mine with -10 on the core and +520 on memory. No matter how low I go on the core or memory I get PerfCap Reason Vrel SLI in GPU-Z... Not sure what to make of that. Might flash it back to A8G bios and see how it does I guess..

http://www.3dmark.com/3dm/15146665?
post #9 of 16
Posting my results with founders cards clocked to 2100. It seems there is a lot of variability in the graphics scores. Are you guys using the fancy HB sli bridge?

http://www.3dmark.com/fs/10323443
Edited by SkitzoPhr3nia - 9/29/16 at 7:53pm
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post #10 of 16
Same here with AMD, one card was a better overclocker then the other, so could not get them stable on the higher overclock. Also seems, based on the results here, that two cards will result in a lower overclock even if both cards can overclock the same separately.
 
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