Originally Posted by error-id10t
Thanks for that, so you're running one card with 770 and the other still with 680 vBIOS? Everything else being equal (volts, no throttling etc) - the card with the 770 vBIOS now overclocks better?
No. I did not try running the 680 with unlocked and the 680 with 770 BIOS together. I guessed that it would not work, so after seeing success with my Superclocked 680 on the 770 BIOS, I flashed my vanilla 680 to the 770 BIOS as well. With both cards flashed to the 770 BIOS, SLI does not seem to work well when it works at all.
Also of note and something I forgot until now: my vanilla 680 lost about 100 MHz of overhead from its effective memory overclock and 2FPS in Valley when flashed to the 770 BIOS. Since it was a much smaller loss than my Superclocked 680 gained, I deemed it an acceptable compromise. (However, keep in mind that my even though my Superclocked 680 had lower core and memory clocks, it was still significantly faster than my higher-clocked vanilla 680 on an unlocked 680 BIOS.)
I flashed both cards back to their stock factory BIOS until I can figure out why the 770 BIOS isn't working in SLI.