Overload Tests

Before overloading power supplies we always test first if the over current protection (OCP) circuit is active and at what level it is configured.

Here we were limited by our load tester, which can pull “only” up to 33 A from each one of its +12 V inputs, giving us a total of 66 A.

The idea behind of overload tests is to see if the power supply will burn/explode and see if the protections from the power supply are working correctly. This power supply didn’t burn or explode and it shut down when we tried to overload it.

Below you can see the maximum we could pull from this power supply with it still working within specs. Even under this overloading efficiency was above 83%. As you can see Corsair could have labeled this unit as a 900 W power supply, but they didn’t do this because otherwise they wouldn’t be able to get the 80 Plus Gold certification.

Input Maximum
+12V1 32 A (384 W)
+12V2 32 A (384 W)
+5V 15 A (75 W)
+3.3 V 15 A (49.5 W)
+5VSB 3 A (15 W)
-12 V 0.5 A (6 W)
Total 912.9 W
% Max Load 121.7%
Room Temp. 46.2° C
PSU Temp. 51.1° C
AC Power 1,099 W
Efficiency 83.1%
AC Voltage 100.5 V
Power Factor 0.998
Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.