I am currently using an 08 8 core MP with the standard ATI Radeon HD 2600 graphics card which runs a 23 and 20 ACD. Under normal usage this card is perfect, but under heavy 3D/CAD usage it begins to slow down as the models get more and more complex. A screen redraw can take up to 4/5 seconds each time. Would I be better off replacing the standard card with a 512mb card or just getting another 256mb so each monitor has its own card. What is the deciding factor in screen redraw times, memory or processor. I have heard reports of people being unhappy with the 8800 for professional graphics as it is more geared towards multimedia and gaming. If this is true is the ATI 3870 any better. I would be very interested in hearing what other people have done in this situation.