what is your voltage? you can probably undevolt it, to gain some in consumption
I'm actually overvolting to maintain stability, but only +31mV per card... With my clocks/intensity like I have it, it's just low enough that it doesn't crash the system while mining. If I happen to lose internet connection the PC will generally lock up due to instability. I've never actually tried undervolting though so I might, it could just be unstable clock settings and not much to do with my voltage settings