I only have the reference cooler version, but if you're interested in a baseline mine overclock to 1000 MHz core/1500 MHz RAM giving right around 875 KH/s with PowerTune at +20%. If I bump it to +30% via MSI Afterburner I can get around 925 KH/s, but one of my GPU's gives out after a few minutes (the the other continues going strong). Both are running at about 80C with fans around 65%.