The new RM750x has a significant performance lead over its predecessor, although it loses in average noise output to the older model which was dead silent. Still, you cannot call it the new model as noisy since it achieves a Cybenetics A- rating, with its average noise output being close to 28 dBA. Moreover, its APFC converter does a splendid job, delivering high power factor readings under all conditions.
The only section that needs a small improvement is the efficiency under high loads, which is the main reason for the not-so-competitive average efficiency. Nonetheless, the efficiency under light loads is sky-high. Finally, the fan upgrade is a highly welcome feature. It boosts reliability, even under tough conditions where most rifle and fluid dynamic bearing fans would have issues in the long run.
If Corsair manages to keep the price at the same levels as the previous generation RM750x, the new model will have a great head-start. The competition in this category mainly consists of the Seasonic GX-750 and the XPG Core Reactor 750, both of which don't reach the Corsair unit's overall performance. On top of that, they also don't have an ML fan which provides increased reliability under all operating conditions.
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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, Future PLC, are financially involved with Cybenetics. Aris does not perform the actual certifications for Cybenetics.