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displayport resolution

I own a Dell OptiPlex 9020, Windows 7 Pro 64 bit with 2 AMD Radeon HD8490 graphics cards -- each card has a DVI and display port each, both set for max resolution 2540 x 1600
I have 3 Dell U2713HM monitors with max resolutions of 2560 x 1440. The 2 monitors plugged into the DVI port with the dual link cable work fine at the max resolution -- the third one is the problem. It is connected to the display port on one of the cards with a dual link DVI cable attached to an Accell DVI to DP adapter (powered thru USB port) (Accell UltraAV DP to DVI-D p/n:B087B-002B). The max resolution I get on this 3rd monitor is 1600 x 1200, no matter how I try it -- I switched cables, changed ports, used display port on the chassis, other card, changed the Accell adapter (I have 3), changed the dual link DVI, but to no avail -- I have the same setup on another system, where it works fine, so I know it can be done ... I just can not seem to make it work on this new system. Any help would be much appreciated ....
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Hotse
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Hotse
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1 Solution
 
Lee IngallsDirector of IT/TS, Quality and FinanceCommented:
Go into Control Panel - Display - Change Display Settings - Identify Display in question and Select it - Click Advanced  - Adapter tab review the "List All Modes" and note the valid modes and what Hertz. The select the monitor tab and confirm the monitor type is accurate and the refresh rate you desire is available.
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HotseAuthor Commented:
tried that already multiple times -- it does not even recognize the 3rd monitor and lists it as a non-PnP monitor,
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Lee IngallsDirector of IT/TS, Quality and FinanceCommented:
Do the graphics card drivers match between the system that does work with three displays and the system that doesnt?
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HotseAuthor Commented:
fixed it myself ..
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_Commented:
What did you have to do to fix it?
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HotseAuthor Commented:
reseated both graphics cards, changed out the ACCELL USB powered adapter for another one (in fear the one I was using was defective), switched dual link DVI cables from one of the correctly functioning monitors and for some reason this worked ...
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_Commented:
Thank you for the info.     : )
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HotseAuthor Commented:
did not receive any help and fixed it myself...
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