notebook fan

Hello everyone. I own a Dell i13-5378-A30C notebook. For a few weeks I've noticed it was heating a lot (reaching almost 90ºC under stress). The CPU cooler was also making weird noises so I thought it was time to replace it. When I installed the new one, I think I might have pushed the tiny...

he isn't a hardcore gamer he mostly plays minecraft and gta. all he wants is a gpu that will run these games with decent FPS. I was thinking the amd 7770 but im not too sure. I want him to get it asap because he is always on my pc when I come home from college so please help a brother out.