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Corsair AX850 850W Power Supply Review

paulktreg    -   September 22, 2010
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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 AX850 850W (CMPSU-850AX) Temperature & Fan Speeds
Supply = 110/230VAC
DC Loading(W)
Temp In (°C)
Temp Out (°C)
Δ Temp (°C)
Fan Speed (RPM)
0
N/A
N/A
N/A
0/0
173/174
N/A
N/A
N/A
0/0
436/436
23.2/23.0
31.5/29.5
8.3/6.5
543/542
845/846
24.1/24.1
32.2/30.9
8.1/6.8
1957/1945

 

The Corsair AX850 employs silent fan control technology that explains the zero fan speed at no load and 170 W loading. The graph below explains it in a little more detail.

 

I have indicated zero fan speed at 170 W which isn’t strictly speaking true because the fan kicked in very intermittently at this level at 300 rpm for few seconds. The silent fan control technology means, according to the graph, no fan noise up to approximately 150W because it won’t be spinning and virtually no fan noise up to 425W at only 10 dBA, a very welcome feature for most enthusiasts I’m sure. The fan noise does ramp up beyond 425W and at full load it becomes noticeably louder but no more than other power supplies in this class. Temperatures remained very low at all times, but once again, please are aware that it wasn’t installed in a case and no hot boxes have been used.




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