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Amd radeon hd 7770 dual monitor capable

January 2, 2013 1:14:44 PM

cant enable "extend these monitors" on my Radeon HD7770. It will only let me run two desktops exactly the same. Downloaded all current driver updates. I7-3770 processor (3.4Ghz), 12G ram, Win7 ultimate. Two Hanns G 28" monitors. HDMI & DVI cables. No problems at all with nVidia GTX-285. Any help appreciated.