I just purchased this laptop and I installed Steam. When playing TF2, the game is so choppy and it doesn't seem to be playing at the 144hz refresh rate. I installed the latest NVIDIA drivers. In the Nvidia Control Panel, I changed the setting to NVIDIA graphics processor and changed the Physx to the Nvidia GPU. In Windows, it does show 144hz but I am wondering why the games are so choppy and almost unplayable. When I use an HDMI and connect it to my TV I can change the refresh rate to 120hz and the game plays great, but on the laptop itself, it's unplayable.