This is the first time I have tested the power supply of a console, and it was a nice experience. Sony's PlayStation 5 uses a powerful internal PSU it doesn't fully utilize. The peak power draw from the wall socket I measured during gaming with a gamepad connected to the PSU, charging, didn't go above 225 W. This means the actual power delivery from the PSU is around 205 W. With 230 V input, peak efficiency for the ADP-400DR is in the 150 to 200 W range, so the PSU is close to its sweet efficiency spot. With 100 V input, the lowest the ADP-400DR supports, peak efficiency (90.47%) is with 150 W load, while with 200 W, efficiency is a bit lower, but still high enough. It is of essence to have the highest-possible efficiency since a gaming console will have to endure hours of non-stop gaming at ambient temperatures that can exceed 30°C. For instance, during summer, my son gave his PS5 a tough time, gaming for long hours at ambient temperatures exceeding 30°C. For some reason, he didn't want to use air conditioning in his room. That said, the PS5 didn't complain and operated without any problems. This shows that the cooling fan helps lower the PSU's temperatures, although the latter uses a restrictive plastic chassis.

The ADP-400DR is built like a tank. I overloaded it with up to 584 W, loaded it until its temperature on the secondary side exceeded 100°C, and short-circuited its rail. Whatever I did, it continued to work properly and didn't die on me. Moreover, I didn't notice any coil whine issues, although several users reported such problems. I own two PS5 consoles and didn't notice any coil whine issues with either. I thoroughly tested this PSU which belongs to a brand-new PS5 and didn't notice any coil whine with it either. There is likely a production batch or batches with this issue—not all PS5 consoles suffer from coil whine. Do note that coil whine doesn't have to do with the PSU alone, but is due to the combination of the PSU and the hardware it feeds with power.

I didn't expect a sub-par PSU in a console meant for non-stop gaming under all conditions, and Delta Electronics is a high-impact OEM with topnotch production lines and solid quality control. Not everything is perfect with the ADP-400DR, though. Load regulation is not as tight as I would like, the primary FETs should be bolted to heatsinks for lower temperatures, which would prolong their lifetime and, above all, would decrease energy losses. And then there is the most severe fault of all—the OCP triggering point being too high. There is no point in allowing this PSU to deliver such high power levels when the PS5 requires 205–210 W of DC power heavily loaded. Even if we take power spikes into account, 584 W OPP is too high and can put the PSU in danger if something goes wrong and it is stressed enough under high ambient temperatures. The good thing is that there is over-temperature protection, which will probably save the day. Finally, Sony should use a higher output voltage PSU (19–22 V) to allow for higher efficiency and better load regulation. Probably in the next PS5 revision? Should Sony's people want some tips on improving the PSU, they can easily find my contact details—I have some ideas I plan on implementing soon with this unit.