Gigabyte AMD HD7990 GDDR5-6GB Dual GPU DVI/4xMini DP Graphics Card GV-R799D5-6GD-B Integrated with 6144MB GDDR5 memory and 768-bit memory interface Features Dual-link DVI-I / Mini DisplayPort*4 Support CrossFireX , Avivo HD, AMD Eyefinity2.0 and EyeSpeed Support Mini Displayport 2.0