Ya it'll fit in the case. Here's a video of a guy upgrading the PSU in your same PC. His didn't quite fit, it was a thermaltake smart BM2 550w PSU with dimensions 11 x 8.46 x 4.84. But the DEEPCOOL PSU you're considering is smaller at 5.9 x 5.51 x 3.38 so you'll be fine. https://www.youtube.com/watch?v=IEptRWi0Tb8
All the unknowns and caveats of upgrading a Dell Optiplex covered in a single video so you can be successful in getting your Dell Optiplex gamer ready! Watch the full videos so you know what you will run into and how to transform your Dell Optiplex into a PC Gaming Power House!
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