READ THIS BEFORE PURCHASING: ATI Sapphire Radeon HD 5850 XTREME 1 GB GDDR5 HDMI/DVI/DP. For an ATI crossfire system, a second sapphire Radeon hd 5850 graphics card, an ATI crossfire x ready mother board and one ATI bridge interconnect cable per graphics card (optional) are required. PCI Express based PC is required w one X16 lane graphics slot available. OS win 7, Vista, xp, xp64edition, win media center edition. Note- worked w my windows10 OS. Software included, for newest SW go to Radeon web site.