Assuming the PC is built for gaming, a Video Card is far, far more important than the CPU and RAM combined. All the CPU and RAM needs to do is make sure the GFX card gets the necessary data on time. As long as the other components are fast enough to "feed" the GFX card, the GFX card becomes the limiting factor in gaming.
If the system is not for gaming (in which case, why a Q9650?), almost any decent GFX card will do.