4k60fps

Hello Guys, I got my Macbook recently and I have a 165hz monitor with HDMI and DP ports So I want to buy a Thunderbolt hub that has an HDMI port on it, but I got confused because there are only 4K @ 30hz and 4K @ 60hz ones on the market. Can the 4K @ 60hz one run 165hz on my 1080p monitor?

Everytime i try to play a 4K60FPS video on Youtube, the video stutters bad and eventually stops and only the audio keeps running. PC spec: CPU: Intel i7 6700K GPU: Nvidia GTX 660 2 GB I use Firefox. There is no stutter when i try to play 1440p60FPS. I have a decently fast internet(100Mbps...