Corsair's RMx line is one of its most successful, combining high performance, affordable pricing, and quiet operation. Of course, the company had to be careful not to spoil the recipe as it took a stab at improvements. But the tweaks seem to have worked. Most impressive is the RM750x's 20mm-shallower depth compared to its predecessor, accompanied by significantly less operating noise. That's a notable feat. Usually, as a PSU gets smaller, it becomes harder to cool. Moreover, the RM750x gets a second EPS connector, allowing it to support high-end platforms requiring more power for the CPU.
The one thing we would like to see made better in the future is the CWT platform's efficiency. It's still 80 PLUS Gold-rated, and we measured 88% overall efficiency. Most of the competition achieves higher numbers than that.
The RMx family's main competition comes from Seasonic (Focus Plus Gold) and EVGA (SuperNOVA G3) mostly. Both competing brands offer great performance, long warranties, and lots of connectors. But their products aren't as quiet as the RMx PSUs. Corsair was one of the first companies to prioritize low noise output, so it put a lot of effort into optimizing layout, airflow, and fan profiles. If you look through Cybenetics' database, you'll notice that only seven of the 49 tested models from Corsair register over 30 dB(A), while 28 models stay below 20 dB(A).
Again, Corsair's new RM750x has three major advantages compared to the first-gen version: shallower depth, the pair of EPS connectors, and quieter operation. But we should also mention the impressive build quality inside of the RM750x, along with a confidence-inspiring 10-year warranty. Beyond wanting to see higher efficiency in the future, it'd be great to see Corsair implement a button for toggling the semi-passive fan mode on and off. That'd allow us to test the fan any time we wanted. Plus, it'd let us install the PSU with its fan facing downward, and not worry about heat building up inside the enclosure and damaging the electrolytic capacitors. After all, even with the fan spinning non-stop, Corsair's RM750x is nearly silent.
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Disclaimer: Aris Mpitziopoulos is Tom's Hardware's PSU reviewer. He is also the Chief Testing Engineer of Cybenetics, and developed the Cybenetics certification methodologies apart from his role on Tom's Hardware. Neither Tom's Hardware nor its parent company, Purch Media, are financially involved with Cybenetics. Aris does not perform the actual certifications for Cybenetics.