Program for GPU stress testing?

[Köhvwezd]

I'm looking for a new software to use for GPU stressing, especially testing if an OC is stable. I've used Valley in the past but that seems quite unreliable, and it seems to work when it wants to. I've also used Furmark but only very little, I had an issue where it would report very low clockspeeds, not sure if it was really running at 575 MHz or if it was a sensor error, but still, the question stands. What is/are the best GPU stressing tools for testing stability?

[Peter Vaughan Truslow]

furmark and MSI kombustor are my quick and dirty tests, but for me I find that games are best for testing stability with Vsync off and settings cranked as high as I can in normal use

[Aniallation]

I'm looking for a new software to use for GPU stressing, especially testing if an OC is stable. I've used Valley in the past but that seems quite unreliable, and it seems to work when it wants to. I've also used Furmark but only very little, I had an issue where it would report very low clockspeeds, not sure if it was really running at 575 MHz or if it was a sensor error, but still, the question stands. What is/are the best GPU stressing tools for testing stability?

At most use Valley. But honestly, just play a game. Do NOT use Furmark or Kombustor as those put highly unreasonable loads on your GPU and can actually cause damage to them in some scenarios. 

[Humbug]

I don't see the point of furmark. Seems like it's just trying to make the GPU as hot as possible and pulll as much power as possible.

But it doesn't represent a gaming (or any other real world) load.