I just purchased the same card, and using EVGA's Precision X OC utility have upped my hash rate about 20%. Still monitoring the power, and may back off of that a bit. I think a slight oc will be worth it in the long run, and it is pretty easy to do. At the moment the pool I am in says my single card is making $2.63 in revenue per day but it swings between $1.50 and $3.00. Power draw is 104 watts, which translates to 119 from the wall, or $.17 a day (I have cheap electricity).