I have a x700pro agp clocked at xt speeds with atitools. I have an artic silencer and it runs at full load around 50c. Anything over 475 core, the card will hard lock the system and need to reboot. I've seen a volt mod out there that may fix that or burn your card up. Got the ram to 530 but put it back down. Got artifacts after a half hour or so of scanning, nothing I could see.