Hi I have your same laptop and have dealt with this problem for about 2 years. I had basically given up on it, but I took the case off and tried reapplying thermal paste to the CPU and GPU. While taking off the cooler, I found tons of dust clogging up the vents from the inside, and I cleaned the vents and fans using an air blower and a small brush. I can now play the same games I used to be able to, and i'm pretty sure it was just the dust. Hope this helps!