Question small form factor dell optiplex 3020

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Illustrious
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The problem with the prebuilt computers such as that optiplex is usually they are not built for upgradabiltiy.

If I'm not mistaken, it will come with a proprietory low wattage and poor quality PSU that isn't really made for dedicated GPUs. Now the RX560 can usually be powered through the PCIe slot alone without additional connections, but ultimately you would likely need a better quality and higher wattage PSU.

Unfortunately from the owners manual, it is indeed a proprietory MB and PSU, so you couldn't buy any ATX standardised PSU to swap in it's place.