I have a possible solution for you . Get a friend with a power supply stronger then the current 500watt you have. I have a feeling it's just not enough to power that RX 480 when it starts to pull on the power it needs to perform at a high power state. If you have other devices installed 500 watts to me seems a bit too low for that card. I found that many times the recommended power supply watts does not include the extra devices one has installed. We all have devices that we like to install and never count them as a power draw. Disconnect everything but the bare bones of your system to boot to windows or linux. Then test to see if it shuts down.
Chances are if it's not a very good power supply company it wont be able to hold it's own against a card like the RX 480 4G / 8G.
Hello Gwenwolf and thanks for answering me!
Are you sure it could be the PSU? It happened again yesterday evening when I was shutting down the computer. I was not playing. Also I have to say that before having a RX480 I had an ASUS GTX 670 DIRECTCU II TOP. I checked on the internet and it says that the average power consumption was 166 watts, and for the AMD it says 168 watts.
I must add that I do not play games in 4K.
I have another computer which has a 750W PSU, I tried to install the graphic card on it but the OS crashes when it tries to install the drivers. I'll try again this week. I'll keep you in touch.
Sources from tomshardware.com:
Use that power pack of 750 watts and place it on the other PC and see if it crashes. This would eliminate one possibility and we can then move to the next stage of elimination. Good Luck!
Have you checked your CPU temps? 500watt is more than enough for a rx480. Seems strange that it only does it for SC2 as well.
Full model name of your RX 480,please
For another PC try to :
1.Delete C:\AMD folder
3.Also we need full system info for that PC
For your own PC:
2.Run HWinfo64>sensors only>Logging start and play for 15-20 min. I want to see that log