Weird 780Ti (SLI) Problems

virtualTune

New member
Hi guys,
been a while since I last asked for your help. This time its the GPUs.

I don't know enough about GPU firmware to answer this myself, so I am hoping there are some experienced Members who can explain all this to me.

Basically I have 2 780Ti OC from Gigabyte. I have had trouble with one of them for months and even after an RMA the problems remained.
(Problem was the PC would freeze after about 15 minutes of Gameplay. Benchmarks and Furmark would run fine. Poblems occured in all PCIe slots and all possible Sli and single card configurations. My research suggests that Gigabyte has been selling overclocked chips that can't handle the OC.)

Last night I had the idea to underclock it by -100MHz and my problems were gone. When I installed the other card to run SLi i got a weird bug about five seconds after booting into windows. Monitor 1 was black, 2 was a soft purple and 3 was grey. I had never seen something like that biggrin.gif
I tried all combinations of the cards in SLi and single but the problem persisted. So I installed a 780 instead (which worked fine) and called it a day. This morning I installed the "broken" Tis again and booted into safe mode. Everything worked fine so I ran DDU and reinstalled drivers. Until rebooting the PC everything worked fine, but after the reboot the same bug with the Monitors happened again. Right now I am on the 780 again.

Also, I checked out the BIOS versions of the two cards.
As you can see below, one has BIOS 80.80.34.00.74 while the other has (P2083-3000) added to it. I have no idea if that last part is relevant and could be related to my Problems. Also note, that the first one is Revision FF and the other one B1. Again, I don't know enough about these things to identify their importance.
The right image is of the one I RMAed

I hope you guys can help me figure this out!

Thanks in advance,

-vT

Specs are in the signature.
 

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What PSU do you have?

Could be that your PSU cant provide the raw power to the cards which is why underclocking them is fine. 780Ti cards are quite beastly in performance and the moment you overclock, the draw from the PSU does increase alot from what I gather.

Also you are using 3 monitors, are they all identical? if you use monitors that arent identical, the cards need to work a little harder to get in sync so even in Idol mode the clocks will raise slightly, temperature too.
 
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What PSU do you have?

Could be that your PSU cant provide the raw power to the cards which is why underclocking them is fine. 780Ti cards are quite beastly in performance and the moment you overclock, the draw from the PSU does increase alot from what I gather.

Also you are using 3 monitors, are they all identical? if you use monitors that arent identical, the cards need to work a little harder to get in sync so even in Idol mode the clocks will raise slightly, temperature too.

I have an RM850, should be enough power. Also, yes I have 3 different monitors. 2 1080p, 1 1440p. What puzzles me though, is that the cards used to work just fine and they even boot fine into safe mode. But as soon as I load up the current driver and go into normal mode, the system crashes. Note, the PC stays on, only the display is off. Also, there is no sound.
 
miraculously the problem has vanished. ast night I swapped in the first 780Ti, then the second for Sli and it works since. No idea what the issue was. Underclocked them both and now have 60fps at very high/high mix and 1440p in GTA :) Thanks for trying to help mate
 
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