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Corsair HX850 PSU Review

Cross-Load Tests & Infrared Images

Our cross-load tests are described in detail here.

To generate the following charts, we set our loaders to auto mode through our custom-made software before trying more than 25,000 possible load combinations with the +12V, 5V and 3.3V rails. The load regulation deviations in each of the charts below were calculated by taking the nominal values of the rails (12V, 5V and 3.3V) as point zero. The ambient temperature was between at 30°C (86°F) to 32°C (89.6°F).

Load Regulation Charts

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Efficiency Chart

For a small region, the PSU's efficiency falls within the 92-94% range. Otherwise, it's predominantly between 90-92%. Once we apply lots of stress to the minor rails, though, efficiency drops to 85-90%.

Ripple Charts

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Infrared Images

We applied half-load for 10 minutes with the PSU's top cover and fan removed before taking photos with our modified FLIR E4 camera that delivers 320x240 IR resolution (76,800 pixels).

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Temperatures inside the PSU are generally normal. However, we worry about the electrolytic caps, which are installed between the +12V boards. The operating temperatures of those caps are increased because both +12V boards naturally get hot, especially under high loads. Thankfully, airflow is unobstructed on the secondary side, so when the fan spins, the caps shouldn't become dangerously warm.


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