Hello everyone, I've been trying to OC my GTX 770 (MSI N770 TF 2GD5\OC), i believe I hit a stable OC at +80 (1245 boost clock) + 240 (3744 memory clock) at 1.2V. The past few days I've been trying to push it a little further, for example +100 at 1.212V but I'm a bit confused with stress testing. For example, with the +100MHz settings, it ran Furmark for 2 hours stable, temp about 72 Celcius, but when I used Unigine Valley, the program stopped working after a bit, and then displayed the same error again on every OC setting until I restart the system, so I considered it to be a software error. So my questions are : What program would you recommend to test my GPU stability? So far I've been using Kombustor 3.3, Unigine Valley, Furmark and 3D Mark (mainly for the benchmark run though). How much time does the stress test need to run,for the OC to be considered stable? Do different settings on the stress test (resolution, AA etc) have different impact, or does GPU core just needs to be at 100% load? To test my memory clock stability, does the VRAM need to be at maximum load?