Is it possible... Yes, it has two PCIe slots, which will run at x16,x4 in Crossfire.
All you have to do is install the cards in both PCIe slots, install the bridge and enable in the control panel.
On a note, I'm not a fan of running cards at x16,x4 for Crossfire. The minimum setup I prefer to run is at x8,x8 but it is an "okay setup".