Question My GPU keeps crashing after 15 mins or 1 hour of gaming

Sep 13, 2023
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I bought a second hand 1660ti from facebook marketplace in September 2023, since then my life has been a hellhole! First of all , all my games crashed just after 15 mins of playtime, I tried adjusting all in game settings and graphics settings none worked. Then I tried swtiching my motherboard that did not help either lastly I upgraded from 8 gigs of ram to 16 gigs same 3200mhz ram after that the games ran but only for 1 hour or so and then they crashed...I tried to test the GPU at my friends home who has a better PC than me and yepp the GPU ran all games with no issues I even gave him the GPU for 3 days to test everything and he said everything was fine working but whenever I try to game on my pc it just crashes...I need help! Also whenever I try to put the gpu in after cleaning it just does not work my pc wont turn on like it does not even do any sounds even though I have a BIOS speaker but when my friend whom I gave the GPU installed the GPU it worked and turned on...at this point I just think I am unlucky or cursed or something.

My system Specs
CPU- AMD Ryzen 3 3200g
RAM- 16GB, Corsair vengeance 3200mt/s
MOBO- Gigabyte B450M DS3H V2
PSU- Gigabyte P450B
GPU- Zotac 1660ti 6GB