Can 60hz run 120fps?

No, the max FPS you can get on your 60HZ display is 60 fps , if it is showing 100 fps on the game also you are getting only 60 fps. While a 60 Hz monitor will only display 60 fps, if you run higher fps the game will render faster.

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Is 120Hz refresh rate good?

A 120Hz refresh rate can be beneficial for certain situations , but a higher refresh rate should not be considered a good reasons to spend more on an HDTV. For most television and movie watching, you’ll probably want to keep the refresh rate set to 60Hz, anyway.

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