The SAPPHIRE HD 7700 series is an extensive family of graphics cards targeting the enthusiast on a budget & mainstream users looking for increased graphics performance. It is based on the latest generation of GPUs from AMD built in its 28nm process & featuring the highly acclaimed GCN graphics processing architecture. The new HD 7730 1GB & 2GB GPUs have an optimised internal structure sharing many of the features of the higher performance models in the HD 7000 series but with fewer Stream Processors. Specifications Display Support: 2 x Maximum Display Monitor (s) support Output D-Sub (VGA) 1 x HDMI (with 3D) 1 x Single-Link DVI-D GPU: 800 MHz Core Clock 28 nm Chip 384 x Stream Processors Video Memory: 1024 MB Size 128 -bit GDDR5 4500 MHz Effective Dimension: 163 (L)x 104 (W)x 33 (H) mm Size. 2 x slot Software: Driver CD System Requirements: PCI Express based PC is required with one X16 lane graphics slot available on the motherboard. 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. 400 Watt Power Supply is required. 500 Watt Power Supply is recommended for Cross Fire X System. Windows Vista, Windows 7 or Windows 8 operating system. 64-bit operating system highly recommended.