Am using the ZotacFirestorm software to overclock.
Without any overclock, it gives a astonishing 567MH/s, The power draw goes as high as 310watts,temp will be at 81c fan speed set at auto.
After overclock, it gives a steady range of 500MH/s-570MH/s, Power drawn is within 200watts usually around 190watts and Temp are within 65c & below with fan speeds at 60%.
