I have a new PC, that came with a Radeon HD 6700. I will be using the PC for AutoCad and so was thinking of buying a GeForce GTX 560 and modding it to a Quadro. As I haven't bought it yet, I am not sure how to check if there's a Quadro equivalent. If not, what would you suggest in or around the same price range? Thank you
Don't do that. The last moddable cards were based on the G80 GPU or older. Current GPUs cannot be modded to Quadro.