EVGA is working on a new software application that tests the stability of the overclock (stress test), and a benchmark program rolled into one.
The software which is based on FurMark has two components: an artifacts scanner, and a benchmark. The test renders a high polygon 3D object with lots of shaders. We have a screenshot available. Check it out.
Oh and BTW, we are working on the exact same thing for MSI AfterBurner as well -- more soon ;)