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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)

Performance Rating

(Image credit: Tom's Hardware)

The new Corsair RM750x is the performance king in the 750W Gold category. 

Noise Rating

The graph below depicts the cooling fan's average noise over the PSU's operating range, with an ambient temperature between 30 to 32 degrees Celsius (86 to 89.6 degrees Fahrenheit).

(Image credit: Tom's Hardware)

The older RM750x unit is notably quieter. Still, you cannot call the new one noisy. 

Efficiency Rating

The following graph shows the PSU's average efficiency throughout its operating range with an ambient temperature close to 30 degrees Celsius.

(Image credit: Tom's Hardware)

A small efficiency boost, mostly at high loads, is required to meet the competition eye-to-eye. 

Power Factor Rating

The following graph shows the PSU's average power factor reading throughout its operating range with an ambient temperature close to 30 degrees Celsius.

Corsair RM750x

(Image credit: Tom's Hardware)

The APFC converter achieves high performance.

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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