MasterWatt 650W coil whine when loaded by graphics card

Cooler Master – MasterWatt 650W 80+ Bronze Certified Semi-Modular ATX Power Supply is whining like a bitch when loaded by Gigabyte 1070 G1.

When I installed Gigabyte 1070 G1 to my PC and started testing it with various benchmarks and games noticed unpleasant sound from PC case that was related to what was happening on screen (FPS, brightness etc ).

Got worried that that is video card as you cannot exactly determine source of sound when everything was in case. Google tough me that this is probably combination of coil whine and bad luck or as it called “coil whine lottery” – even with same brand sometimes you can get it.

As my first suspect was graphic card, started googling and trying different things to get rid of it: overclock, under clock gpu, change some power settings in bios, limit frame rate. But nothing helped.

Then i decided to try to identify source of the sound more precisely. I took PSU out of case, connected it outside and suddenly realized that sound source was not from GPU (gpu was totally silent) but from PSU itself.

When idle or stress testing just CPU, RAM, SSD or integrated video – PSU is super silent (I did all those test when I was waiting for GPU to arrive – PSU was super silent).

But when you just stress test Gigabyte 1070 G1 (or even just start any game), it load power supply some much that it literally start whining.

That whining is not very terrible with closed case, but still unpleasant to hear and I really do not want to have it in my PC setup. Call me perfectionist with this matter.

So, bad luck for me with this one, changing Cooler Master MasterWatt to other brand now.

Not sure what I will do with this Cooler Master, I cannot return it, probably they even will not accept it for warranty, will have to figure out something. Or maybe I just will open it (then definitely warranty void) and will try to figure out if there is an easy fix – some hot glue on a coil etc. And later use it as a spare or make a lab power supply from it.

So, Cooler Master – MasterWatt 650W 80+ Bronze – thumbs down.

Cooler Master MasterWatt 650w - thumbs down
Cooler Master MasterWatt 650w – thumbs down


  1. I have the exact same problem. GPU (RX590) and the power supply CoolerMaster 650W.
    The coil whine is very loud for me. what was your solution ?

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