What to use to stress my GTX 280??

Hi guys,

So originally I had what I thought was a pretty decent overclock on my GTX 280s. ATI tool stress runs for over 30 minutes easily WHILE OCCT is running the CPU stress test as well. However, when I run Crysis Warhead, I start getting artifacts everywhere and then I get a black screen, followed by a "display driver stopped responding" issue.

Now I'm running the game at 1920x1200, everything on very high (enthusaist) and with 4x AA. (runs fairly smooth actually).

Could it be that Crysis stresses my cards more than ATI tool and if so, what can I use to properly stress my cards?

Try using FurMark

http://www.ozone3d.net/benchmarks/fur/

It heats up my cards pretty well although it doesn't support multi gpu's...

SLi is supported. CrossFire isn't.