Programs to push a graphics card

[jgbishop]

What programs (that aren't a game) are available to really push a graphics card to the limits? I've never run a demoing program before, so I'm not sure what's out there. I've just recently gotten a GeForce 6800 GT, and I want to see what it's capable of doing.

Any suggestions? Free is preferable.

 

[Gunslinger08]

http://www.futuremark.com -- 3D Mark 2005
http://www.aquamark3.com/ -- AquaMark

 

[Paktu]

http://www.daionet.gr.jp/~masa/rthdribl/