Dual Monitor Resolution Problem

Windows 7 dectects primary monitor HF229 correctly with 1680x1050 res. Second monitor is same HF229 but detects it as Generic PNP Monitor with max resolution of 1600x1200. Having flicker problems at lower than 75mhz and 1680x1050 on either monitor.

How can I get 2nd monitor to display properly?

Intel Q9550, Gigabyte board, ATI Radeon 4870 all drivers in windows and ATI are updated.

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