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Card Features and Layout
Early specs described the HD 3870 X2 with 8 pin power sockets however Visiontek included the more traditional set of 6 pin PCI-e power leads. The recommended power supply for a single card is a 550 Watt or greater with at least 2x 6-pin PCIe® power connectors (750 Watt PSU and 4x 6-pin connectors for dual ATI CrossFireX™).
To learn more about ATI’s CrossFire X, check out their support page at: http://game.amd.com/us-en/crossfirex_about.aspx A complete combination Options Chart can be found here: http://game.amd.com/us-en/content/images/crossfirex/CF_combo_chart_July08.jpg