Cannot confirm your experience with overclocking. My Rig has been running stable with 1140/1800 clocks for 28 hours now. Each 280x toxic is hashing with like 360h/s.
Don't know about changes in power consumption, but I don't really care cause its free anyway

i don't show off my OC experience, i just make the best and easiest way to config stable miner for another in forum
