chino may have already alluded to this.  7050 board is not standard microATX and is thus very awkward to transfer to a regular non-Dell case.  all the front panel IO are integrated into board (fixed) and would not work with new case FIO.  Users had reported successful upgrade to Dell proprietary 500 W psu in this model for gpu upgrade.  this is much easier to do than swapping case for standard atx psu.  [IMAGE]  
Hi,  I have a 7050 OptiPlex with these specs  Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz 3.19 GHz 16.0 GB (15.9 GB usable) 64-bit operating system, x64-based processor Windows 10 Pro  180w Power Supply  I'm trying to upgrade this PC for gaming with a graphics card and a new power supply, I recently tried a XFX Speedster SWFT105 Radeon RX 6400 Gaming Graphics Card with 4GB GDDR6 on my OptiPlex 7050, but it didn't work, it just stayed on the Dell loading screen, and I figure out that the graphics card need it a minimum of 350w power supply so I had the idea of moving everything from my OptiPlex 7050 to a new bigger case to easily replace the power supply and to easily upgrade my pc in the future. But I don't know if all parts are safely removable on the OptiPlex 7050 or if some parts are completely fixed to the computer and cannot be removed 
Transferring components of a OptiPlex 7050 to bigger new case and power supply