FIFA 15 lag macbook pro retina 15

Hello guys,

I have a huge problem, I have just install Windows 8.1 pro on my retina 15 mid 2012, then I install bootcamp drivers, then the latest Nvidia Drivers and when I run FIFA 15 the game just lag and make some black shutter and it does it whatever the resolution and quality sttings im playing with.

here a video : https://www.youtube.com/watch?v=rbCRsPNEZSA

first i was thinking about the temperature being too high that the CPU was downclocking itself but I have intall coretemp and the mac is running a 75°C, max 90

Can you help me on that ?

thank you

sorry for the English, im french

See you guys