The HP ProDesk 600 G5 SFF depends on a proprietary external brick

HP went the external brick route for the ProDesk 600 G5 SFF — a proprietary 180W or 250W unit that’s replaceable only with an identical HP adapter. There’s no standard ATX PSU inside, so forget about hunting down a modular upgrade at Micro Center. You’re stuck at whatever wattage HP decided to ship.