Dell XPS 8500 upgrade for photo editing only

RDB2015

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Nov 16, 2015
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I have a Dell XPS 8500, Intel i7-3770, 3.4GHz with turbo boost 2.0 to 3.9 GHz A12 Bios and 24GB ram and Running Windows 10/ 64bit. The PC came with an AMD Radeon HD 7570 series video card. I want to upgrade to run my Photoshop SC6 with a BenQ BL2711U monitor which has a resolution of 3840x2160 at 60Hz. Since I will not be gaming do I still need to upgrade my PSU to a higher wattage? Do I have room to fit in a GTX 960 2 GB or 4 GB graphics card? What do you suggest for a video card and PSU upgrade if needed that I should use for my 8500?
Thank you
RDB2015