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| p.1 #5 · Setting up highest res on Dell U2711 with Macbook pro |
I don't know much about Macs, but it could be that the max resolution of the GPU is 1920x1200. Also, it could be the DVI not being able to go higher than 1920x1200. Not sure about HDMI, I would think that it could go as high as what the GPU is capable of.