1) I erd here and meant to mention double buffering ...that said....your computer cannot make your gpu faster only slower to vsynch therefor you want as fast as possible screen refresh otherwise your LIMIT is like 60hz ie 60fps etcetc
2) Please re read OP post cause he states hes tried extra laptop cooler.
3)Games can be blamed since some even at low settings cause issues on inferior hardware.
In conclusion your post hurt us a little is was so funny and its STILL going to be a hardware issue for the OP.Blocked vent, duff fan, unseated heatsink etc .Not Defiance .
Some info for you to read on the subject before you launch into a diatribe etc;
More reading here
http://www.tweakguides.com/Graphics_9.html