GPU Rig, what to use it for?

Yo.

I have 2x AMD HD FirePro 7990's, they total 12GB vRAM, I threw it on my dummy build, Dual Core, 4G Ram, what should I use it for? I'll include pics later of the shitty station I have it on.

//EDIT//

Here's a pic, ghetto rigs unite!
http://i.pi.gy/Xbna.jpg