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Old 11-28-2019, 04:32 PM
gothicaholic gothicaholic is offline
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Default Corsair RM750i dips in efficiency

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.

Last edited by gothicaholic; 11-28-2019 at 04:47 PM.
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Old 12-02-2019, 06:55 PM
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It is very possible to see lower than 87% efficiency on that PSU as the 80 Plus Gold efficiency rating states that at 20% load the efficiency is minimum 87%. So at idle you will indeed see the efficiency drop below 87% as the system is not puling 20% load.
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Old 12-02-2019, 10:40 PM
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Originally Posted by gothicaholic View Post
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.


On this page:,4223-5.html

Note the nose dive the PSU makes at 100W.
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