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Sapphire Pure 1250W Power Supply Review



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.





Sapphire Pure 1250W
Temperature & Fan Speeds @ 110/230VAC
DC Loading(W)
Temp In (°C)
Temp Out (°C)
Δ Temp (°C)
Fan Speed (RPM)





Once again I should explain that these figures are for reference only. The exhaust temperature of 40.5° @ 110VAC is a little higher than I have seen on similar power supplies in this class, but the power supply was delivering 1250W with a moderately quiet fan running at 2187 rpm. If the power supply was installed in an enclosure giving increased air temperatures into the power supply then I could easily see this figure hitting 50°C at full load without further increases in fan speed, but how many systems out there pull 1250W? The power supply is rated at an ambient temperature of 50°C anyway, so is this a problem?

I have included a photograph of the LED lit fan in all its glory for you lovers of case lighting. It's not my cup of tea, but I have to say, with its eighteen bright white light emitting diodes spaced evenly around the fan mounting, the effect is quite stunning.

Going back to the features list and the Post Cooling design, I can confirm that the fan remained running for 45 seconds after shutdown. It's a useful feature that must do some good in the long run by cooling down the components at shutdown and preventing what Sapphire call the heat surge. This heat surge, however short, must happen if the fan is suddenly stopped at shutdown so it's a feature that should extend the lifetime of the power supply.

The Sapphire Pure 1250W does get a little hot at full load, which to some extent is to be expected, but the fan speed doesn't ramp up too severely and I have to be honest - it's quieter than I expected.



  1. Introduction & Closer Look
  2. Closer Look (The Power Supply)
  3. Specification & 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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