hi,
I have flashed the BIOS of the OC version over the TOP version and it works great as SLI. Worst case you can revert to your previous BIOS version on the card using a spare VGA card.
I finally added my 2nd GTX680 as a SLI tonight. I had Asus GTX680-DC2T-2GD5 for 1year and decided one month ago to buy an extra one versus moving to a GTX770 (not much improvement to be expectec unless moving to GTX780)
I had of course a mistmatch version of BIOS on the two cards since they were bought at different time and one was OC version and the other one TOP.
Having flashed the BIOS using the link from :
http://www.techpowerup.com/vgabios/139531/asus-gtx680-2048-130124.html
VBIOS Info
Filename: Asus.GTX680.2048.130124.rom
Version: 80.04.47.00.0D
Build date: 2013-01-24 00:00:00
Date added: 2013-05-26 01:05
MD5 Hash: 4ba1af18e15a6efe3ec3a2537fdf7adb
i followed the process for flashing the Video BIOS using a USB key and NVFLASH (attention, you need the version above 5.125 to have the GTX680 recognized properly - actual version is 5.137), and the tool flashed both BIOS to the same DC2T version.
I had to use also an extra command to remove the memory lock (nvflash --removeprotectoff If I remember well)
Only concern -> the overall SLI setup is getting very noisy (2x3 slots used) after a few minutes on BF4 on UTLRA settings. Could a GTX780 be quieter and as powerfull ?
Will check for watercooling, however, at 140US$ per card, that's quite some investment. Not sure which brand I will use yet, but to cope with the Asus DCUI design, only one manufacturer seems to have waterblock compatible.
here is the link from this forum
http://www.tomshardware.co.uk/answers/id-1824981/asus-direct-gtx-680-waterblock.html
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