i just remembered, if you have nvidia cards post 8800, run trine or any other similar game which uses physx.
physx will stress out your gpu far more than the simple graphics of trine show.
@CP, if you are relying on the thermal paste to settle over time
for noticeable cooling enhancement, you are doing something wrong

in general any metallic paste (from the cheapest to the most expensive) have one thing in common. plug and play.
ceramic based pastes (ceramique, other nonmetallics etc) generally need about 10 to 15 minutes to settle after you put them on the cpu, if you use the "put blob in center of cpu, plunge cooler ontop, bolt down" method.
if you spread it out yourself, you can do it quicker, but its really really messy, and its hard to get off of anything that you get the paste on.