PSU Switch Short Crackling Sound

[Lantotski]

Good day everyone!

I bought a Seasonic M12II 620W Evo 80+ Bronze Fully Modular PSU together with the other parts last week. I've noticed that sometimes (twice already) it makes a short (1-2 seconds) crackling/buzzing sound when I toggled on/off the psu switch. PC boots and loads windows 10 normally and does not produce any weird/annoying sounds while running. Haven't tried to stress test the whole unit yet and check if the crackling/buzzing sound will occur for a long period. I've read posts saying that it's coming from a relay in the psu and its normal. Others say it's coil whine or a symptom of a faulty psu. The sound just occurs when toggling the psu switch. PSU directly plugged into wall outlet but Im planning to buy an ups/avr this coming Saturday.

Is it really normal?

Thank you!

CPU: Intel i7 6700K
MOBO: AsRock Z170 Fatal1ty Gaming K4
RAM: GSkill RipJaws V 2x8GB 2400 CL15
GPU: None
SSD: SanDisk Plus 240GB
HDD: Seagate Barracuda 2TB
PSU: Seasonic M12II 620W Evo 80+ Bronze Fully Modular
COOLER: DeepCool Captain 240 EX Red
CASE: Phanteks P400 Black

 

[Aeacus]

It's normal for some of the Seasonic PSUs and it is the relay. Coil while is a humming sound during the usage, not a short crack when flipping the power switch. Your PSU isn't faulty due to that. Getting UPS/AVR helps to stabilize the current rushing in and you shouldn't hear the crack noise after that.

 

[Lantotski]

It's normal for some of the Seasonic PSUs and it is the relay. Coil while is a humming sound during the usage, not a short crack when flipping the power switch. Your PSU isn't faulty due to that. Getting UPS/AVR helps to stabilize the current rushing in and you shouldn't hear the crack noise after that.

Thanks for that! I'll check if that sound would disappear once I got an avr/ups. Hoping for more answers.

Aw sorry Aeacus I accidentally pressed down vote while scrolling.

 

[Aeacus]

You're welcome.

As far as voting down goes, don't worry, you're not the first one who has accidentally voted my answer down and i'm pretty sure that you're not the last one either.