I bought this used RTX 3080 Ti for like 700 bucks off eBay and I feel like I got scammed or something because the memory temps are hitting 108 degrees when I try to play Cyberpunk and it smells like hot plastic. I am honestly so stressed out right now because this was my whole savings for the year and I feel like a total idiot for not knowing how this stuff works.

People on Reddit said I need to change the thermal pads but I have literally no idea what those even are. Are they like double sided tape or squishy stickers? I looked on Amazon and there are so many different brands and colors and then there is this stuff about thickness like 1.5mm or 2.0mm and I dont want to buy the wrong thing and accidentally crush the chip or something. I live in Chicago and the shops near me want a fortune to fix it so I have to do it myself by next weekend for a work project.

Sorry if this is a dumb question but I am totally lost and scared to even take the screws out of the back. I just want whatever is the highest quality stuff so it stops overheating. Which thermal pads are actually the best for cooling these high-end cards and how do I know which size to get?