Thanks Oliwier. Did you actually return the GPU for a replacement then?
By "rest of it" do you mean the motherboard, PSU, Hard drive (one or more), Network card, Memory, Mouse, Keyboard, Bluetooth, WiFi?
Are you overclocking? Arte you using memory XMP Profile? Please set everything to default, no OC and lets see what happens. If that works okay then you can start OC ion small steps till you find the settings that work for you.
Turn on Driver Verifier for non-Microsoft drivers a few at a time and let's see what that shows.
Driver Verifier-- tracking down a mis-behaving driver.
Following the instructions in the above link will check for problems in all non-Microsoft drivers.
What we're looking for is a verifier generated BSOD with a mini dump that will tell us what driver caused it. If you get a BSOD, rerun the V2 log collector as soon as possible and upload the resulting zip file. Also see if there is a new C:\Windows \MEMORY.DMP file. If there is, copy it to another location then zip it an upload to a file sharing site like OneDrive and post a link to it here.
To check if verifier is active, open a Command Prompt and enter:
verifier /query
If not active it will respond with
No drivers are currently verified.
Follow instructions here to decide which drivers you want to test. 3-5 is a good start. Add 3-5 more every two hours until all are selected or you get a BSOD.
Enable and Disable Driver Verifier in Windows 10
Familiarize yourself with how to get out of Driver verifier from the above link and from the first link.