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Question: Graphics Card for Optiplex 755

I am looking for a graphics card that I can use in my Optiplex 755 Mini-Tower. I want to get a card that has native HDMI output and DVI output as well.

I would rather not mess with the power supply if it can be avoided. If I need to replace the power supply I would need to know a power supply that could be used as a direct replacement preferably with no modifications to the case.

I would greatly appreciate any help.