HIS HD 5870 (DirectX 11/ Eyefinity/ Full HD 1080p) 2GB (256bit) GDDR5 6 x Mini Display Port PCIe (Eyefinity 6 Edition) < HD 5800 Series < Desktop graphics < Products | HIS Graphic Cards
2GB vs. 1GB: Does it Matter? - AMD's Radeon HD 5870 Eyefinity 6 Edition Reviewed