Hi [NAME], It's not said what form factor/size your 5090 is.  Just the MT alone has 3 different PSU's for it.  However, the Optiplex 5090 Spec Sheet has a list of GPU's along with Dell PSU's it comes with.  The micro has no expansion slots for GPU cards. [IMAGE]  
I have an OPTIPLEX 5090. I would like to upgrade the graphics card for gaming. can anyone tell me which graphics cards are the best for the model without requiring a PSU upgrade? and which are the best if i can spare a few bucks for a new PSU?
graphics card