I have one of those cards and also a gigabyte version and those DD cards run hot! Get as much cooling to it as possible because I notice if I let mine get to warm it starts to slow down and then once it's cooler again then it picks back up, it's doing like a sea-saw effect. I have an external fan blowing straight to it and moved it to a cooler room in the house and it's been doing a lot better, over clocking it also affects the temp very much too. The DD card runs in the 90's where the gigabyte is in the 70's.