I've got a Palit GTX 580, the 3GB monster. How high would you guys think you can overclock a 580 in terms of core, shader and memory speeds? Mine is running at 885, 1770 and 2010, after playing with V tune, I think from memory, and it never gets above 78 degrees after 15 minutes of Furmark. Is 900 or even 1000mhz possible or even worth the risk?