As you know by now, before overloading a power supply we like to see if the over current protection is active and its trigger point. Do test this we only installed the cables that were connected to the power supply +12V1 rail (using both +12V1 and +12V2 inputs from our load tester) and increased current until we saw the power supply shutting down. This happens when we pulled more than 29 A from the +12V1 rail.

Then starting from test five we increased current on all outputs until we reached the maximum the power supply could deliver still working inside ATX specs. The result you can see below. If we increased one amp on any output the power supply would shut down.

The main goal of our overload test is to see if the power supply burns or explodes and if its protections are active. Thus Thermaltake Toughpower 800 W passed this test.

Even though Thermaltake Toughpower 800 W has its protections working well, we could only overload this unit 9% from its labeled value, and under this maximum overloading voltage +3.3 V outputs was out of spec and ripple and noise on +5 V and +3.3 V outputs was above the maximum allowed. Of course you should not operate this unit above 800 W.