As per many of you I use 3Dmark2005, 2006 & Vantage. But for those who wants some Space/Space Ship eye candy and to stress your systems, this is an excellent Rolling Benchmarking Demo. The Visuals are simply stunning and you get a nice FPS Min max readout, aswell as CPU and GPU (driver) Info.

X3: Terran Conflict Rolling Demo Benchmark

Demo Versions: X3: Terran Conflict Rolling Demo Benchmark - Demo Movie Patch Download Section - GamersHell.com