From 630 to 670 MH/s using Sapphire 7950 OC (stock 925/1250) clocked to 1200 MHz Core and 300 MHz memory. GPU-Z shows VDDC @ 1.56, Fans at 100%, ambient temperature about 30 degrees and core cant get above 68 degrees but the GPUs and MB are not in case Got lucky to chose Sapphire and now I highly recommend these cards.