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Corsair RM750i dips in efficiency


gothicaholic
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So I started getting electrical buzz coming from my GPU / GPU Motherboard socket area once GPU hits certain clock speed and PSU hits 200 Watt, Tried a different GPU and same result - GPU / GPU Socket area has coil whine. (to be noted that I had this GPU Mobo PSU combo since I bought the PC around April 2018 - Asus GTX 1070 DUAL OC + Asus prime Z370-A + Corsair RM750i Gold + and I have never experienced anything like those sounds to like last week).

 

Since that I started monitoring my PSU through iCUE and noticed that my PSU Efficiency dips under 87% to sometimes even 60% at even Idle state of PC, 87% is the minimal amount of the PSU (80+ Gold), Could this point to a faulty PSU? I dont have experience with PSUs at all.

Edited by gothicaholic
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87% is the minimal amount of the PSU (80+ Gold)

 

It actually isn't. 87% is the minimum efficiency at 20% load. PSUs tend to be VERY, exponentially, inefficient at lower loads.

 

Reference: https://www.tomshardware.com/reviews/corsair-rm750i-power-supply,4223.html

 

On this page: https://www.tomshardware.com/reviews/corsair-rm750i-power-supply,4223-5.html

 

Note the nose dive the PSU makes at 100W.

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