The cross-load characteristics of this PSU look good. The voltages go out of the allowable ranges only when there is a great load misbalance that just cannot occur in a real PC. The +3.3V voltage is ideal. The +12V voltage is within a 2% deflection through over a half of the diagram. The +5V voltage, the least stable of the three, is going to fluctuate within 1-2% above the nominal value in a real PC.
I want to remind you that the typical power consumption of modern PCs corresponds to the bottom third of the diagram, up to 40-60W on the Y-axis, because all the heavy consumers are powered by the +12V rail, which corresponds to the X-axis.
The output voltage ripple is normal at full load. In the oscillogram above one vertical square corresponds to 50 millivolts whereas the industry standard allows an amplitude of 50 millivolts on the +5V and +3.3V rails (the top and bottom, red and orange, lines) and of 120 millivolts on the +12V rail (the middle, green, line).
The PSU employs a Young Lin Tech DFB132512H fan. Fans from this maker are often used in PSUs that are cooled by a 135mm fan.
The fan speed is constant up to a load of 400W and then begins to grow up in a linear manner. The speed is average, with a minimum of 1230rpm, so the ENFP-750W is average or somewhat worse than average in terms of noise. It is going to satisfy many users, yet you can compare its results with those of the Cooler Master RS-850-EMBA for example. The latter’s fan is only half as fast at low loads.
The efficiency is good even as today’s PSUs go. It is 85% at loads from 350 to 400W. The PSU overcame the 80% mark at a load of about 100W, i.e. at less than 15% from the maximum.
Thus, the Floston Energetix ENFP-750W is a good modern PSU that delivers conscientiously what is written in its specs. It offers stable voltages, a full selection of connectors (but again, I would want it to have a second cable with a couple of SATA plugs), and average noisiness. Without a doubt, many people will also be attracted by its original packaging, a neat aluminum box.