BFG MX-680 Power Supply Review
Overload Tests
Contents
Before overloading power supplies we always test first if the over current protection (OCP) circuit is active and at what level it is configured.
OCP kicked in when we tried to pull more than 26 A from +12V2 input from our load tester (which was connected to the power supply +12V2 through the ATX12V/EPS12V cable).
We could pull up to 797.5 W from this power supply. If we tried to increase one amp the power supply would shut down, showing that a protection was in action, which is great. After all, the goal of our overloading tests is to see if the power supply protections are working and if the power supply burns when we overload it.
One thing that we noticed during our reviews was that the auxiliary 80 mm fan was not entering in action, even thought the temperature inside our “hot box” was at 50° C and the power supply housing was measuring 53° C. With the tip of a pencil we manually moved the blades of the fan and it started spinning. We had this exact same problem with the 550 W version from this power supply.
| Input | Maximum |
| +12V1 | 32 A (384 W) |
| +12V2 | 32 A (384 W) |
| +5V | 10 A (50 W) |
| +3.3 V | 10 A (33 W) |
| +5VSB | 2.5 A (30 W) |
| -12 V | 0.5 A (6 W) |
| Total | 797.5 W |
| % Max Load | 117.3% |