I've been dealing with this issue for a little while now, and for a while it seemed to be ok, but it has gotten bad again. My PC seems to restart itself, but reboots within a couple of seconds. It only seems to do it in both versions of skyrim, though it seems like it happens more often in Special edition than in the original. as I type this, I'm running furmark, and it has been going for 12 minutes without a reboot. My temperatures seem pretty normal while running skyrim. Thinking it might be PSU, since it's made noise since I got it, but I have some doubts only since it doesn't restart during other games or applications.
Specs are i5 4670k
GIGABYTE Z87X-UD3H
Seagate 2Tb hdd
samsung 1tb hdd
Kingston 120gb ssd
EVGA GTX780 acx
2x8gb Corsair ram
corsair hx750 psu
Specs are i5 4670k
GIGABYTE Z87X-UD3H
Seagate 2Tb hdd
samsung 1tb hdd
Kingston 120gb ssd
EVGA GTX780 acx
2x8gb Corsair ram
corsair hx750 psu