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RE: Dual Monitors for OptiPlex 9020 or XPS 8700 (NVidia GTX 745 4Gb)

You will find difficulties in the future trying to upgrade the power supply on the 9020. The XPS 8700 can use most of the retail modular power supplies. DVI and HDMI are identical as far as video is concerned, so no, should be no problem going video card HDMI to monitor DVI. But, the U2415 HDMI in ports can only do 1920x1080. The U2415 DP/mDP in ports can do 1920x1200. The U2415 ships only with the Dell DP to mDP cable.

Nvidia Geforce GTX 745 HDMI out --> HDMI to HDMI cable --> 1st U2415 HDMI in = 1920x1080
Nvidia Geforce GTX 745 DVI out --> DVI to HDMI cable --> 2nd U2415 HDMI in = 1920x1080

If you choose the XPS 8700 with the Nvidia GTX 660:
Nvidia Geforce GTX 660 DP out --> DP to mDP cable --> 1st U2415 mDP in = 1920x1200
Nvidia Geforce GTX 660 DP out --> DP to mDP cable --> 2nd U2415 mDP in = 1920x1200

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