Scythe Kamariki 4 550 W Power Supply Review

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. We increased current on +12V2 up to 33 A (the maximum supported by our load tester) and the power supply didn’t shut down, meaning that the unit either doesn’t have an OCP circuit or it is configured at a value above 33 A (according to the manufacturer OCP is configured at 40 A on each +12 V rail and that’s why we couldn’t see it in action).

Starting from test five we started overloading the power supply. Below you can see the maximum amount of power we could pull with it still working inside ATX specs. We only stopped overloading it because noise on -12 V was above the maximum allowed (120 mV) when we increased on more amp from any output.

The goal from our overloading test is to see if the power supply will burn or explode if you try to pull more than its labeled power. This didn’t happen with Kamariki 4 and in fact we could pull 46% above its labeled power, which is remarkable, as power supplies usually allow us to overload them somewhere between 15% and 25% from their labeled wattage. Notice, however, how efficiency was low under this extreme configuration.