The specifications aren’t impressive. The Enhance FLEX-0130B can only yield 250 out of its full 300 watts via the most important +12V rail. The relatively high load capacity of the other rails is good but hardly really necessary for modern PCs.
The efficiency isn’t high, either. The basic 80 PLUS certification is not even a mainstream feature anymore, at least for full-size ATX products.
Working together with our APC SmartUPS SC 620, this PSU was stable when powered by the mains up to its full load of 300 watts. It could switch to the UPS's batteries at loads up to 255 watts.
By the way, since we're testing low-wattage PSUs today, we check out their UPS compatibility at loads lower than those we usually use for full-size ATX PSUs, i.e. down to 280 watts.
Cross-Load Voltage Stability
The diagram is indicative of joint voltage regulation, but the PSU is good enough in the typical load range: the single reference PC configuration that meets the PSU’s wattage is in the green zone.
It is only at unrealistically misbalanced load combinations (high load on the +3.3V and +5V rails and low load on the +12V rail) that the voltages may go out of the permissible limits.
The results are very good for a PSU without dedicated voltage regulation. It is in the typical load range that the voltages are the most stable.
Output Voltage Ripple
The high-frequency ripple is noticeable on every power rail, especially on the +5V and +12V rails, but always stays within the permissible limits.
We can see a similar picture at the double mains frequency.
Temperature and Noise
The PSU is cooled by a 40x40x20mm ADDA AD0412XB-C51 fan. As opposed to the ADDA fans in Seasonic's M1U products, it has 5 rather than 7 blades and a rated speed of 8500 RPM.
Like with Seasonic’s Mini 1U series, the configuration of the fan grid and the small size of the fan prevented us from measuring the speed. Subjectively, the Enhance FLEX-0130B is noisier than the above-discussed Seasonic PSUs, becoming audible at a load of 100 watts, uncomfortable at 150 watts and downright loud at 250 watts and higher. So, this model can hardly be recommended for people who prefer silent computers.
Efficiency and Power Factor
The Enhance FLEX-0130B is 80.5%, 83.6% and 82.7% efficient at loads of 20%, 50%, and 100%. That's enough for the basic 80 PLUS requirements but falls short of the 80 PLUS Bronze standard. The peak efficiency of 84.8% was observed at a load of 230 watts.
The power factor was almost as high as 99% at full load.
There’s nothing wrong with the standby source of this PSU.