Hi, I made a big mistake. I bought a "Sapphire Radeon 9800 PRO Ultimate Edition" including "Zalman ZM-OP1" instead of a GeForce 6600GT AGP (for the same price). In any case I installed it on my AMD Athlon XP 2000+ system with RAM 512MB DDR. How can I overclock my 9800 PRO the best way and is it possible to make a 9800XT out of it? What is the maximum that is possible with my cooling? Thanks! Bye!!!