ATI Technologies 100-435703 Radeon X1800 XL 256MB GDDR3 SDRAM PCI Express x16 Graphics Card 256MB GDDR3 memory with up to 256-bit memory interface Requires installation into a desktop PC with an available PCI-E expansion slot - PCI Express based PC is required with one x16 lane graphics slot available on the motherboard. Connection to the system power supply is required (Adapter Included). 512MB System Memory is uggested Compatible with WindowsXP, WindowsXP x64 Edition, Windows Media Center Edition 2005, Windows Vista 321 million transistors on 90nm fabrication process Ultra-threaded architecture with fast dynamic branching