that would be a X2 card
crossfire aint supported on Nforce board
X48 Express X38 Express P35 Express nForce 790i SLI Ultra SPP nForce 780i SLI SPP Front-side bus1600/1333/1066MHz 1333/1066MHz 1333/1066MHz 1600/1333/1066MHz 1333/1066MHz Memory controllerDDR2-800
DDR3-1600 DDR2-800
DDR3-1333 DDR2-800
DDR3-1333 DDR3-2000* DDR2-800 PCI Express 1.1 lanes0 0 16 2 0 PCI Express 2.0 lanes32 32 0 32 32 Multi-GPU supportCrossFire CrossFire CrossFire* SLI SLI Chipset interconnectDMI DMI DMI HyperTransport HyperTransport Peak interconnect bandwidth2GB/s 2GB/s 2GB/s 8GB/s 8GB/s