XFX FX-799A-XNF9 Radeon HD 7990 6GB 384-bit x2 GDDR5 PCI Express 3.0 x16 CrossFireX Support Video Card Chipset: AMD Radeon HD 7990 Engine Clock: 950 MHz Video Memory: 6GB GDDR5 Memory Clock: 6.0 GHz Memory Interface: 2x 384-bit Bus: PCI-Express 3.0 x16 Max. Resolution:4096 x 3112 Connectors: DVI-I, 4x Mini DisplayPort