Cougar GX-F750W PSU Review

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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

The efficiency sweet spot is between 160W and 440W at +12V, with the minor rails staying below 95W of combined load.

Ripple Charts

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Infrared Images

We applied half-load for 10 minutes with the PSU's top cover and cooling 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 generally remain low. One of the hottest areas is close to the +12V heat sinks, where several polymer caps and one electrolytic one (a Teapo SC) reside. The polymer caps can easily handle higher temperatures. But the electrolytic one cannot because it contains liquid electrolyte. If we were in Cougar's position, we would have replaced this single Teapo SC cap with a much more reliable Chemi-Con KY.

Fortunately, airflow across the secondary side's filtering caps is totally unobstructed. The same goes for most of the components on the main PCB.


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Aris Mpitziopoulos
Aris Mpitziopoulos
Contributing Editor

Aris Mpitziopoulos is a contributing editor at Tom's Hardware, covering PSUs.

5 Comments Comment from the forums
  • orionfotl
    Nice review! The platform's codename is TPK.
    Reply
  • Aris_Mp
    Thanks Orion! Will update the part's table.
    Reply
  • shrapnel_indie
    All of Cougar's PSUs are made by HEC/Compucase, an OEM with many years of experience in this field.

    HEC/Compucase, for at least the last decade hasn't been known to produce a single good unit. Cougar would do well to find a better OEM.

    I'd love for HEC to have finally get a good platform though... AND never go back to less.
    Reply
  • Dark Lord of Tech
    Not a FAN of HEC powere supplies , but a great review , Thanks Aris.
    Reply
  • bettsar
    Looking at the comparison products, are these numbers for the EVGA 750 G3 or the B3? If the everything is pointing to the G3 (including the cost), that definitely seems like the value leader. If the cost is pointing to the B3, then it could change the story quite a bit.

    However, I also see that the RM750x appears to have dropped in price, which would likely put it at the top of the value chart.
    Reply