2 of my 6870's seem to work ok but when I mine the temp just goes thru the roof. I tested them playing games and they work fine. I know one overheated because the fan died so I put a new fan on. I have no idea why the other one isn't working.

Does anyone have any ideas on how I can possibly save them. I put new paste on both. And have tried more fans. It's definitely a problem in the card. I also tried different power supplies and fresh windows installs. They seem to draw too much power or something because one just fried my brand new 550 watt power supply.

I am going to take them apart again and look for something wrong. I didn't see anything before. I am also thinking of trying the oven trick. I bought these cards for bitcoin when it was like 130 so I feel like I have 1000's in them and really want to fix them. They are only like 6 months old but I used bitspend and cant find my receipts for the warranty. Because they seem to work ok under light loads it makes me think they can be saved. Maybe someone knows what part is bad. Any help is really appreciated, thank you.