Final Analysis
Although Enermax's EPF1200EWT employs a slightly different platform than the TPG-1200F1FAP, they don't perform similarly at all. It seems as though the LLC resonant converter's analog controller cannot match the performance of the micro-controller that Thermaltake uses for the same circuit.
Ripple suppression is good enough at +12V, 5V, and 5VSB, but only average on the 3.3V rail. On the other hand, the EPF1200EWT has an accurate power-good signal, which isn't the case for Thermaltake's TPG-1200F1FAP. Moreover, the PSU we're reviewing today boasts a super-compact 16cm depth, given its 1.2kW capacity. This is remarkable, and it'll make installation much easier in smaller cases.
Another interesting feature of this PSU is its Dust Free Rotation (DFR) technology. We don't know how effective DFR is, or if it lives up to Enermax's promises over time. One thing is for sure, though: if you install the PSU with its fan facing upwards, this technology won't do much since the dust will eventually settle back onto the PSU.
The twister bearing-based cooling fan is rated for 160,000 hours, according to Enermax. That sounds great, since good fluid dynamic bearing fans typically top out around 60,000 hours of operation. But we couldn't find any information about the operating temperature Enermax rates its fan for. More than likely, it's under 30°C, which is unrealistic for a power supply in a closed case.
In our opinion, the Platimax D.F 1200W's biggest disadvantage is a high street price. For $250, there are several attractive alternatives that offer better performance and quieter operation. None of them are as compact as the EPF1200EWT, and they don't include the same high-quality cables with individually sleeved wires. But for anyone who prioritizes performance above all else, the EPF1200EWT is just too expensive.
We suspect that those individually sleeved cables are to blame for the high price, so if Enermax wants to compete more aggressively, it could offer the special cables as an optional kit or sell another version of its EPF1200EWT with plain cables to improve this model's affordability.
All in all, the EPF1200EWT is a fairly good PSU. It just doesn't set itself apart in terms of performance at a $250 price point. We'd only recommend if it you're interested in Enermax's extra bells and whistles, or if you need one of the smallest 1.2kW power supplies available. It'd be better if Enermax used plain cables and implemented full digital control in the primary side to improve performance. That'd help it match competitors like Thermaltake's TPG-1200F1FAP and Corsair's HX1200/HX1200i.
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