In practice this problem may show up as interference the PSU will produce to other electronic equipment plugged into the neighboring wall sockets. Alas, that’s exactly what happened to our testbed with the ensuing consequences to the accuracy of my measurements.

The individual dots that contrast with the overall picture are the result of interference the tested PSU produced to the relatively sensitive part of the testbed. I want to note that I didn’t have that problem with other PSUs.

Apart from that, it is easy to see that the TOP-800P8 U14 features independent regulation of voltages. It easily works under any allowable load, the output voltages never going out of the limits prescribed by the standard.

The output voltage ripple under full load is within acceptable limits. This is only high-frequency pulsation.

The PSU is cooled with a Globe Fan RL4B S1352512MB fan.

Its speed is constant at 980rpm under loads below 450W. After that it begins to grow up linearly, reaching a maximum of 1380rpm. The PSU has no overheat-related problems. The temperature of the air that’s passing through it grows but slightly, by less than 10°C. Moreover, the TOP-800P8 U14 is quiet at work. Perhaps it cannot match Seasonic’s S12 series PSUs in this respect, but most users are going to be satisfied surely.

The efficiency of this PSU lowers towards the maximum output power, reaching 85% at the maximum. The power factor isn’t high as power supplies with active PFC go. It is only higher than 0.9 at a load of 300W and more. That’s the result of the electromagnetic interference the PSU causes in the mains as I noted above.

Of course, the TOP-800P8 U14 surpasses P7 series products as well as the above-described TOP-700P8 in its characteristics. It is worthy of your interest as it yields stable voltages with low ripple and is also quiet at work. On the downside is the sloppy operation of the PFC device which results in the generation of EMI for other electronic equipment. There are also design issues: the case has an increased length, and the screening of the cables doesn’t provide any advantages while makes it more difficult to lay the cables out in the system case.