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Corsair RM750x (2021) Power Supply Review

The Corsair RM750x (2021) tops the performance charts.

Corsair RM750x (2021)
Editor's Choice
(Image: © Tom's Hardware)

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. 

(Image credit: Tom's Hardware)

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.

Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.

  • RAZ0RLIGHT
    Is there any reason why the 2021 revisions fan curve is so much more aggressive?
    This would be the perfect Gold PSU if they would have implemented the same fan curve as the older 2018 revision.
    Reply
  • I
    RAZ0RLIGHT said:
    Is there any reason why the 2021 revisions fan curve is so much more aggressive?
    This would be the perfect Gold PSU if they would have implemented the same fan curve as the older 2018 revision.
    Disagree. It's still very quiet and I'd rather a tiny noise increase to reduce temps, increase lifespan.

    This is probably what Corsair determined as well through wear testing, decided that not only would that reduce their warranty fulfillment costs but also improve customer satisfaction by having a longer lasting product.

    If you don't care about the warranty, crack it open, put a few tens of ohms 2W resistor in series on the fan power lead, or just swap in a lower RPM fan, or mod the fan control circuit, or wear earplugs, or put the system under your desk, or get a cat plus 100 mice let loose all at once and you'll never even notice the very slight fan noise.

    Besides, it's all a bit silly. If your system is pulling that many amps it's going to need its own more audible fans running anyway. For good lifespan. An internal, reward-facing exhaust, oriented fan is the least audible way to pull or push air through a system.
    Reply
  • Russll
    Hello
    A few days ago I bought a Corsair RM750x (2021). Now the power supply consumes little (20-30%) because it works without a video card (AMD 5700G only).

    The Aida64 and OCCT show voltage on rail +12V - 11.884V, and on rail +3.3VCC - 3.248V, on rail +5V - 4.980V (computer idle, browser only).

    In the game, the voltage rises and shows on rail + 12V - 11.980V (maximum), and on rail + 3.3VCC - 3.264V (maximum), on rail + 5V - 5.020V.

    Is this normal at all.?
    There is no full 12V on rail + 12V, and no full 3.3V on rail + 3.3V..
    Maybe I should return the product to the store.?

    Reply
  • drivinfast247
    Russll said:
    Hello
    A few days ago I bought a Corsair RM750x (2021). Now the power supply consumes little (20-30%) because it works without a video card (AMD 5700G only).

    The Aida64 and OCCT show voltage on rail +12V - 11.884V, and on rail +3.3VCC - 3.248V, on rail +5V - 4.980V (computer idle, browser only).

    In the game, the voltage rises and shows on rail + 12V - 11.980V (maximum), and on rail + 3.3VCC - 3.264V (maximum), on rail + 5V - 5.020V.

    Is this normal at all.?
    There is no full 12V on rail + 12V, and no full 3.3V on rail + 3.3V..
    Maybe I should return the product to the store.?

    Perfectly normal operation.
    Reply
  • Russll
    drivinfast247 said:
    Perfectly normal operation.
    Thanks, I hope everything goes well.
    Reply