Battlefield 3 campaign.
I'm doing to Paris level and my jaw has been on the floor the whole time. The game runs REALLY well compared to the beta and the Crossfire scaling is nearly perfect. I'm playing at a mix of high and ultra settings with 4xAA.
Core i5 2500K @ 4.8 GHz || 16 GBs 1600 MHz DDR3 || Sapphire Radeon HD 7970 || Dual 128 GB SSDs