Well, I finally mounted a Seasonic Focus PX-750 (80+ Platinum), aimed for futures upgrades but enough for my current PC, 10 years warranty and so on.
And the best part, no more shut downs since I mounted it. Thank you @Aeacus
First of all, thank you for the answer
1. Temps are CPU: 33ºC on idle, over 70ºC at demanding games, and 73ºC max during CPU OCCT test. GPU 37ºC on idle, around 70ºC at gaming (max nearly 74ºC, a little higher with OCCT GPU test).
I've only seen higher temps with the OCCT power test, nearly...
First of all, sorry if I don't explain well enough, and thank you in advance for helping.
All this started a few weeks ago, I decided to clean my computer case. I opened it, clean the dust (I didn't use anything electronic, and the computer was unplugged), removed the RAM and moved the HDD...