The SAPPHIRE HD 7790 2GB OC Edition has 2GB of the latest DDR5 memory & is factory overclocked, with core clocks of 1050 M Hz & memory clocks of 1600 M Hz (6.4GB/s effective), to deliver new levels of performance in its price segment. Performance is optimised with the latest version of AMD’s Power Tune technology. The 2GB board features a new cooler design, which uses a dual heatpipe system & a single aerofoil section fan assembly with dust repelling bearings for maximum efficiency & reliability. A unique & SAPPHIRE original feature is the integration into the cooling system of the metal backplate which cools the memory chips on the reverse side of the pcb & helps with pcb rigidity. A finned heatsink attached to the backplate passes through the pcb & extends into the airflow from the fan on the front side of the card, enabling the airflow to carry away the heat from the components on the back of the pcb & reducing memory temperatures to as low as 13 C. Specifications GPU 28 nm Chip 1050 MHz Core Clock 896 x Stream Processors Video Memory 2048 MB Size 128 -bit GDDR5 6400 MHz Effective Display Support 4 x Maximum Display Monitor (s) support with 1 Display Port connected supports up to 3 display monitor (s) without Display Port 4 x Maximum Display Monitor (s) support Output 1 x HDMI (with 3D) 1 x Display Port 1.2 1 x Dual-Link DVI-D 1 x Dual-Link DVI-I Dimension 215 (L)x 106 (W)x 38 (H) mm Size. 2 x slot System Requirements PCI Express based PC is required with one X16 lane graphics slot available on the motherboard 2X75 Watt 6-pin PCI Express power connector is required for Cross Fire X system 1X75 Watt 6-pin PCI Express power connector is required Certified power supplies are recommended. Please refer to: http://support.amd.com/us/certified/power-supplies/ Pages/listing.aspx 4096MB Minimum of system memory Installation software requires CD-ROM drive DVD playback requires DVD drive Blu-ray™ / HD DVD playback requires Blu-ray / HD DVD drive For an AMD Cross Fire X system, a second same AMD Radeon graphics card, an AMD Cross Fire X Ready motherboard & one AMD Cross Fire X Bridge Interconnect cable per graphics card (optional) are required 500 Watt Power Supply is required 600 Watt Power Supply is recommended for Cross Fire X System To support 4 displays, one of the monitors has to support Display Port