Over Power Protection and Max Wattage
Power supplies often quote as having various protection mechanisms such and the most important of these is Over Power Protection. In our testing we crank up the power draw until the power supply either shuts down (meaning the OPP mechanism is present and working) or blows up (meaning it is either not present or not working). We then note the maximum power consumption before the power supply shut down (or blew up).
550W? We managed to crank things up to over 800W before the OPP kicked in. I wouldn’t recommend running the PSU this hard for long periods, but it’s got enough grunt when you need it.