so, here's what I did, step by step. I downloaded both SLI Patch 1.5b and HyperSLI 0.9... After re-installing the R331.88 drivers, I disabled UAC, and then went ahead and used HyperSLI. The thing installed, but then when I ran the HyperSLI OS and went to the Nvidia Control Panel, clicked on set up SLI, selected Maximize blah blah blah, and then when I clicked apply, my screen reverted to a really small resolution, Nvidia Control Panel stopped working, and then it said my driver failed and EVGA Precision X said no hardware running (aka my 570's weren't even recognized). I tried the same process with SLI Patch 1.5b and it had the same results. So, I went ahead and searched it up on youtube. After watching an 11 minute video of step by step instructions, I installed the 275.33 drivers from Nvidia. Then, I ran SLI Patch 1.5b, and then ran the Nvidia Control Panel (of course, after a lot of PC rebooting). I was able to successfully enable SLI. Then, I ran Unigine Heaven Benchmark and it worked like a charm. I tried the Unigine Valley Benchmark, but the SLI wouldn't kick in. I tried all of my games, and for each one, right after the first loading screen is done, my whole PC freezes and I have to force restart it with power button. I tried again, this time with Hyper SLI (even HyperSLI 1.0) and I had the same exact results. I also tried to import SLI profiles from the 331 driver to the 275 driver, but with no success whatsoever. Same problem. I then went into my BIOS and enabled Virtualization, hence HyperSLI needed it for better results. Right now, I even tried the games without RivaTuner or EVGAPrecisionX running, and same problem.
EDIT: games I've tried: NFS World, World of Tanks, Aion Online, TERA Online. I even tried World Of Warplanes, and surprisingly it works, but the 2nd GPU stays clocked at 51 MHz and doesn't do anything.
Edited by Snoopi25 - 11/24/13 at 1:13pm