Thermaltake London 550W Power Supply Review

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).

OPP was triggered 138W above this unit’s rated capacity: Thermaltake rate this unit for 660W peak output and we can see that is indeed the case.