Quadro FX 1700 + Geforce GTS250

That could work, thanks, but, how can I enable/disable the graphics card? E.g.: Let's supposed I am using AutoCad, now I finish my job and want to play a game.... how can I disable Qaudro and enable the GeForce?

Since they use the same driver package they should work and some apps including games allow the user to select which card that will be used to run the game. Some 3D apps are the same way. If you already got both cards then feel free if not then the GTS250 will have to suffice and will still run CAD and 3DSmax.

nforce4max, thanks for your response, is there any risk to my system? I really want to take advantage of both worlds (Open GL with Quadro and Direct X with Geforce), but I wouldn't jeopardize my system for it.

There is very little risk unless you have a failing psu. What is your psu not just the rating but the brand and model.

I have a Coolermaster real 850W (I don't have the model here). Total system consists of a i7 975, 6GB memory, 3x320GB HDD in Raid 0 + 40GB SSD, 1x Quadro FX1700, Gigabyte MB X58A-UD7.

Best answer selected by Macarina.