My pc build of ~1.5 years has started making some quiet, but noticeable rattling sound when I'm gaming. I cleaned the pc from dust and checked that no wires are touching fans etc, and tried putting all the adjustable fans (CPU OPT, SYS FAN 1 and SYS FAN PUMP) to 100 % speed to see if they were the culprit. Turns out they didn't cause the sound. Here are my stats when I'm playing a game and I can hear the sound:


Here is the complete set-up:
AMD Ryzen 5 1600 6x 3.20GHz So.AM4
Gigabyte GA-AB350-Gaming 3 AMD B350 So.AM4 Dual Channel DDR4 ATX
16GB (2x 8192MB) G.Skill RipJaws V DDR4-3200 DIMM CL16-18-18-38 Dual Kit
275GB Crucial MX300 2.5" (6.4cm) SATA 6Gb/s SSD
8GB Gainward GeForce GTX 1070
550 Watt Corsair RMx Series RM550x Modular 80+ Gold
2x Corsair 120mm ML120 Premium Magnetic Levitation fans

Is there something that seems to be off? Any help is appreciated, thanks.

Have you tried removing/disabling 1 fan at a time, going through all your fans? If it's a loose bearing in a fan, turning said fan to 100% won't always make it louder, but is often only audible at specific RPM.
It could also be a faulty pump impeller, a capacitor, or a mechanical drive, among others.

have u changed power outlet lately? psu/gpu can make noice at high load when power is not stable.. if u use like an old extension cord try pluggin into the wall instead or try a differnt outlet

if this is not the problem, maybe u got a bad psu/gpu can u should try return it if u still have warranty

Thanks both of you, been a bit busy but I've continued trouble shooting according to your advice. I changed power outlet and it helped maybe a bit, it doesn't start the sound as soon into a gaming session as it did previously I tried all turning the fans up in small increments and did not hear what would resemble the sound I get when gaming. :/

Have you opened your case, and reseated all your components? (RAM, GFX Card, etc)
Also check all your case screws.