Wondering if anyone else has experienced the core 550mhz barrier with a GTO2? Whenever i try to overclock the core as soon as it hits 550mhz the card crashes. There are no artifacts in ATi tool at 549mhz or below and the card runs great. I see it is mentioned in the MadMoxx GTO2 review by W1zzard. http://forums.techpowerup.com/showthread.php?t=9002 http://www.techpowerup.com/reviews/MadMoxx/X800GTO2Burstfire/4 Does anyone know what causes this and if there is an easy fix i.e. bios flash?