Sapphire 100247L HD 4870 512MB GDDR5 PCI-E/2 Port DVI-I/TV Out Video Card GDDR5 memory and 256-bit memory interface DirectX 10.1 24x custom filter anti-aliasing (CFAA) and high performance anisotropic filtering ATI CrossFireX multi-GPU support for highly scalable performance Use up to four discrete cards with an AMD 790FX based motherboard