Bugger me, but the old PSU is suddenly working again!

After it has been sitting in time-out in a cardboard box for over a month, I decided to have a look why it is producing 10VDC instead of 12VDC, and it is again making 11.97VDC.

I wonder if there is some component that fails when used for some hours, and then slowly recovers while resting?

Any ideas what this 'self-repairing' part may be?

To find out, I have connected the old PSU to the miner with it's 2 functioning hashboards. It is now running BraiinsOS+ so I have much control over the power consumption.

The old PSU is at least several times louder than the entire miner with the 200mm Phresh fan cooling it! It is impossible to hear the miner because of the PSU noise.

I start testing the old PSU by running the miner on 900W setting, which will actually use about 657W because of the missing hashboard. This setting is the most efficient one I have found so far, using 74J/TH at the wall, including PSU, fan and WiFi extender.

I'll crank up the power until the PSU fails again and then see if anythings is obvious as the cause.