I have GTX 680 SLI. When I play games that require high GPU usage and they work at 96-98%, my computer freezes with a looping sound, and the only way to turn it off is manually, by pressing the shut down button. I'm pissed I've paid so much and can't get what I've paid for. I've searched many forums about this and so far I've found it could be the AIDA64 but I do not have it installed, my cards aren't overclocked, I've installed latest drivers, I also tried the earlier drivers, nothing's changed. I just use Precision X to watch my temperatures, the games I play I use V-Sync on to lock at 60 and still I get the freezes. My computer is brand new, I got it a month ago.
My other system specs are Windows 7 Ultimate 64-Bit SP1, Intel Core i7-3820 @ 3.60GHz and 32.0GB RAM.
I've re-installed my computer today and am downloading the game to try if it's still going to crash.
Besides power, have you monitored how hot your top card is getting? I have 2 Gigabyte 670's and while gaming my top card hits in the mid 70's till i decided to open the door on my case. But my cards exhaust out the side and not the back of the case. How good is the air flow in your case?
I watch temperatures and GPU usage with Precision X, and when playing very demanding games they reach 75 C. However I do not think it's because of the tenperatures, since I got frozen when it was 50C and when it was 75C, the only thing those had in common was the GPU Usage which was at 98%. I took out my PSU and it says that it's a 825 Watt one. I use NVIDIA 301.42WHQL Driver.
I would also like to mention that disabling ubersampling reduced my gpu usage by 30% and I did not get any freezes.
I have yet to read about the OE supplier of the Alienware PSU, but thinking it's junk isn't far out of the realms for Dell, they cut corners on other components like the X79 motherboard.
How hot are those cards getting, and what driver are you using?
I would recommend a quality power supply, or finding the 12v rail specs for the supply you have, does it really have 4, 8 pin GPU plugs, or are you just using all the 4 pin molexes?
I have read some A4's shipped with 525watt PSU's, is there a chance yours has this?
It has 2 6pin plugs going into each GPU. I tried looking online for power supplies for my case, but all I could find were 875 ones. Saw a YouTube video of a guy with a 1200W in a case just like mine, but he had to do some rewiring, and I'm a newbie when it comes to that.
All I know is, gpu usage reaches 98% and it stays there for a couple of seconds - means a freeze for me. Coming to think of it, if I have 2 GTX 680 should games even make my GPUS work that hard? I thought just for 1 680 all games were a piece of cake.