Question Pc shuts down

[tibsy]

Hi, i recently built a pc for my friend but his pc kept crashing and getting bsods. So i thought it might be the rx 5600xt which is known to have bad drivers and could be the issue. So he replaced the 5600xt with a better one, the rx 5700xt. Its the gigabyte gaming oc model. His pc was ok the first day but afterwards his pc just shuts off when gaming. Or anytime theres a slight load as he tested valley benchmark as well and it still crashed. His gpu and cpu temps seem fine so dont know whats causing the instant shutdown.
Could it be the PSU??

Specs
Ryzen 5 3600
Msi b450i gaming plus ac
Gigabyte rx 5700xt gaming oc
16gb ddr4 crucial ballistix 3200mhz
Evga 600w w1 80+ white (With uphere sc501 red cables)
Nzxt h210i

 

[vMax]

Have you tried the PSU without the extension cables from uphere as that can cause issues on some PSU's.

 

[tibsy]

Yes i did. I tried another power supoly as well. Corsair tx 550m i think and still same problem. But after i swapped the gpu with a less powerful one like rx 480 it didnt crash but couldnt test for hours. But im thinking could it be that the motherboard pcie is not supplying enough power. Even though i have got an additional 8 and a 6 pin from the psu connected, i feel like its the motherboard.