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You can drive up-to 3 monitors simultaneously if you wanted to, all digital connectors are dual-link DVI ready up-to 2560x1600 monitor resolutions. The 5670 is equipped with DisplayPort, HDMI and DVI monitor output connectors. The HDMI and DisplayPort connectors will output multi-channel sound as well, damn handy when connecting straight to a receiver or HDTV.
The backside of the card is fairly simple, interesting to see are the Crossfire connectors. If memory serves me right, the original reference product did not have them, forcing crossfire over the PCIe bus. You can just pop in two or more of them on your motherboard and enable Crossfire in the drivers.
The card makes use of 128-bit gDDR5 memory from Samsung with the 05 designating 0.50ns (4.0Gbps).