I have a GT 640 OC version graphics card installed in my computer with Gigabyte OC Guru 2. What should I change my values to? I don't have any special type of water cooling, the base is 1045 gHz and it can get a 1046 extra added onto the gHz. Memory clock gHz is 920 and can get 180+ added onto it at max. Should i put everything at max since I really need good performance since I've been getting very frequent FPS drops on my main game.