Check out the first review, it's no good. Buy a certified cable.
Any old HDMI is fine for 1080p. Pushing 4k120 requires a lot of bandwidth and a decent cable.
HDTVTest used the TrueHQ HDMI 2.1 cable and worked perfectly doing 120hz @ 4K & VRR.
I picked up a club3D 2.1 cable but have yet to test it due to lack of cards being available.
I can also confirm this cable works doing 4k120. Not tested gsync because lack of firmware, but now they've released it I'll get around to updating my monitor at some point I guess
Note: I have the 3m cable, so I can only assume the 2m also works.