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Unable to drive Dell 30" Monitor

You first need to know what the highest resolution that your Dell monitor is capable of. I would check on the Dell support site to see if there is a W10 driver for the monitor. In the case of all the monitors I have installed on computers, I didn't need any driver support for the monitor but they varied in what the highest resolution that was available to set them at. I just looked at the highest resolution of my W10 desktop that I'm working on right now it's highest it could go to was 1600 x 900.
 
My monitor supports 2560*1600 and I've got the latest drivers (noted for W7 but said to work for W10). But again, I can't even get to 1 step higher than 1280*800.
 
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