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Corsair HX750W Power Supply Review

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Testing (Continued):

Temperature, Noise Levels and Fan Speeds:


I am not going to give a pass or fail in this section, as the ATX12V V2.2 does not really have any references on which to base a decision.

Temperatures are purely for information only, as there are too many variables involved when installed in a case, which, by the way, it wasn't. Ambient temperature, processor cooling efficiency and case cooling fans all play their part on the temperature of the air entering the power supply, and consequently the temperature of the air leaving it. No valid conclusions can be made from this test.















Corsair HX750W
Temperature & Fan Speeds @ 230VAC
DC Loading(W)
Temp In (°C)
Temp Out (°C)
Δ Temp (°C)
Fan Speed (RPM)



Once again I should point out that the power supply wasn't installed in a case. These temperatures are simply input and output air temperatures measured while bench testing the power supply and are given for reference only. Interestingly, the cooling fan did not start up when powered from 230VAC with no DC load, yet gave a fan speed of 955 rpm, again with no DC load, when powered from 110VAC. Please don't read too much into this, as it isn't going to cause any problems and is probably just a quirk in the temperature sensor/fan drive circuitry. When compared with the performance of the Corsair TX750W power supply, the temperatures are marginally less, but with substantially lower fan speeds, explained, no doubt, by the excellent efficiency of the Corsair HX750W. I have included the noise/loading graph from the box for your information. During testing, the only fans I could hear were the two attached to my test load! According to the graph and figures obtained during testing, you should expect a constant fan speed of approximately 1000 rpm up to about 525W. I found the Corsair HX750W fan to be very quiet throughout testing and fan noise should not be a problem.


  1. Introduction & Closer Look
  2. Closer Look (The Power Supply)
  3. Specifications & Features
  4. Testing: DC Voltage Load Regulation At 110VAC & 230VAC
  5. Testing: Efficiency, Power Factor & DC Quality
  6. Testing: Temperature, Noise Level & Fan Speed
  7. Conclusion
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