GPU suddenly oveheating

[publius10]

i've seen similar threads on this forum but none of them have helped me so i'll try here.
I have a gtx 570 which has been going fine until this week when it suddenly started overheating after i installed Tomb Raider (2013). It idles at 50-60 C and stays there when i'm for instance watching youtube videos, but as soon as i play any game the temperature skyrockets to 100 very quickly (<5 min) and then the pc crashes - screen goes black but M&K still responsive, meanwhile GPU fan goes on full blast.

I've since
-uninstalled Tomb Raider
-cleaned the fan/heatsink
-clean nvidia driver reinstall (multiple times and different versions, now on 359.00). note: before the first reinstall, it would heat up even while idle - start at 60 and just slowly climb to 90+. this more than anything is what makes me think it's a malware issue.
-win10x64 reinstall (kept programs and files)
-full scan with malwarebytes and symantec

the only thing i can think of doing at this point is reapply thermal paste, but i don't think it's a hardware issue, more likely my install of tomb raider was infected, but i don't know how to fix it. can't do system restore because all the restore points vanished in the win10 reinstall.

update: have applied thermal paste to no effect. still probably a malware issue, someone pls help.

 

[Sergeant_Sneaky]

Is the fan actually spinning when the PC says it is running at max speed? How much thermal paste did you use? Is your GPU usage high at idle?

 

[publius10]

Is the fan actually spinning when the PC says it is running at max speed? How much thermal paste did you use? Is your GPU usage high at idle?

yes fan is spinning fine, not sure exactly how much thermal paste i used, but enough. since then i've tried putting a clean ubuntu install on a separate harddrive and testing there - no difference, which at least proves i was wrong about the malware. took the video card to a few repair shops which were of the opinion that the gpu was fried, but didn't test it (not worth for me to have them test for $50 when the card cost me $100 to begin with). at this point i'll probably just wait until nvidia releases their next gen of cards and get one next year - this one still works fine for everything but games, and even then i can always play league.