I'm glad it is working well for you, as it is for many.
If you plan on having it a long time (especially since you OC) I
highly recommend you get some good thermal compound' (I like Arctic Silver II or III)
chisel off that thermal pad and give it the cooling that will extend it's life.
The cooler is easily removed by squeezing the push-pins from the reverse side with
a pair of needle nose and pushing them through the PCB. Then firmly lift the cooler
to break the crystalized interface. Clean off all the remnants trying not to scratch the heat sink
Apply a THIN layer of thermal compound and replace the cooler to it's original mounting.
ThermalTake makes a copper cooler that is very inexpensive (about $12.00 at BestBuy or less on-line)
replacing the whole thing will potentially save you from the premature fan motor failures experienced
frequently on this video card.
Linky to a decent cooler that doesn't cost too much
-Sid