Hello, im running a ATI Mobility Radeon HD 5870 in my laptop and havnt had any issues for a year and a half on heat, but recently its been shutting down when i try to play any sort of games, so i suspected my GPU was overheating. I installed speedfan to get a temp. reading on it and its running right now (only this web site up and Speedfan) at 84 degrees! i just cleaned the vents, and currently im actually using my laptop WITHOUT the bottom piece on, so it is entirely exposed to the air, so airflow is NOT a problem. I am probably going to try repasting it tomorrow when i get some at radioshack, any other suggesting as to why im running so hot?
I would suspect it's dust clogging the vents but if you've cleaned it and it's still a problem then you probably need to replace the thermal paste.Although i'm not sure how you would go about doing that since it's a laptop.Make sure you don't void the Warranty.