Hello all!
Looking for a little assistance...
I just got a 780i and installed it over the weekend, reformatted my OS (Vista 64-bit Home Premium) and now Sins crashes within a few minutes of use. What's strange is Sins is the ONLY game I have that does this... I ran Vegas 2 for a good hour with no issues what so ever. It plays fine for about ten minutes or so, then you hear the sound loop and the screen is completely frozen.
I read some where that Sins has a RAM issue and you have to under clock your RAM to 667. I also read if you lower your settings to High instead of Highest, the issue is fixed. I didn't get a chance to try either of these out but am curious about other people's thoughts.
I also tried Sins in single GPU mode and it still crashed, it just took slightly longer. Any help would be GREATLY appreciated!! 
PC Specs:
EVGA 780i FTW (Supports 1066 RAM, but for some reason has under clocked it to 800)
QX6850 3.0 Ghz (Not OC'd)
2x BFG 8800 GTX
8 GB DDR2 1066
74 GB Raptor HD (OS)
2x 300 GB Raptor HD (Programs)
300 GB WD (Backup)
1000 Watt Ultra PS
Vista 64-bit Home Premium