I have about the same setup (see sig below). I never OCed with the stock cooling, I was to afraid to! It is a hot running card anyway. I upgraded to an Artic Colling VGA Silencer, and I OCed to 465 core and 740 memory. I usually run a little lower, cause I dont need all that speed. You can see my aquamark score in my sig as well. Get a VGA Silencer first, they are less than $20 shipped and work awesome! If you have any Q's let me know, since our comps are very similar. Oh ya, I used ATI tool to OC, I highly recommend it over any thing else.