Quadro 6000 sucks
--No seriously, it's a workstation card, what it's supposed to be for is for improving performance in CAD programs like Maya or 3ds Max, they don't really improve it much though, certainly not enough to justify the thousands of dollars you'd pay over a gaming card. And they also suck at games.
And here's the worst part---in some cases, they would build graphics card, and take the best that came out and sell them as Quadro's with the Quadro firmware. And then take the others, take off some of the hardware to dumb them down and then sell them as gaming cards.