Originally Posted by adas
Sheidow is right....I mean it's not for SURE, but the Thermaltake doesn't have poo for power, and the Asus probably has the same 12v rail the TT does
But since it works at stock, it's either right at the point of not enough power, OR, maybe it's not a power problem. What you should try is downclocking your cpu to stock speed and voltage, then see if you can OC the videocard more
If that doesn't help, what are your temps? If they are fine, then I don't know what to tell you man
I'll post back in a sec.