Pc random stuttering, sound doesn't work properly, game chrashes.

Jul 27, 2018
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I recently upgraded my pc components, my specs:

Windows 10
Nvidia GTX 1060 6GB.
Core i5-8400 2.8 Ghz.
asus prime h310m-k Motherboard.
2 X 8GB DDR4 Memory (in total 16GB)
1 x Coolermaster cpu cooler, and 1 case cooler.
1 x Samsung EVO SSD 128GB.
1 x Seagate barracuda HDD 1TB.

PSU: MS-TECH S-ATA netzteil MS-N450-SYS V 2.3.

I bought a game pc a couple of years ago, and the hardware was really outdated.
I basically changed everything except for the power supply (wich is a really old one, but when i was calculating it on a site it said my system onely needed around 390 watts so i tought i was fine).

The problems I'm having are:

When playing games, speaking with friends through my mic I sometimes hear stuttering.
When the stuttering happends it just skips what they saying for around half a second or so.
And also when that stuttering happends, my pc just freezes for the exact same time. I think its because my PSU is not that good anymore? and maybe 450 Watts is not enough for my system to run properly. Can someone help me out? Thank you.