Molex to 8pin

I just got my used RX580 2048sp Sapphire Pulse. I have my old Ryzen 3 3200g, 8gb (4x2) 2666mhz (OC'd at 2913), a320 gigabyte mobo, and a 700w psu called Neutron (generic psu, forgive me it was prebuilt). I have reconfiged the molex and sata power cables behind my computer because it was kinda...

As title says i have this running for something ~4 years already. There is a good chance i was avg overheating it for a year since i havent changed paste on it (bro used it up on his...) and cooler was loose for decent period till i found it out. Is there a way to know if my cpu is damaged or...