I always just start prime, then loop Sandra burn in software, then loop 3dmark. If it'll run 24hrs through all of that without crashing or overheating (MB monitor and Shutdown Now are a must), I call it stable. One thing I did notice. I have ran those three overnight and only hit 43C. But yet a serial generator for...well that's not important...got my temps up to 45C. I don't know what computations were going on in the background, but it would make great burnin software/stability tester. It has a benchmark option as a matter of fact.