HIS H485QS512P Radeon HD 4850 IceQ4 HDMI Dual DL-DVI HDCP 512MB 256bit GDDR3 RoHS PCI Express 2.0 X16 Video Card - Retail GDDR3 memory 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