Like most of the other best Samsung TVs, the new 98-inch QN900C has Samsung’s Gaming Hub and Motion Xcelerator Pro. That delivers 4K at up to 120Hz, rising to 144Hz with compatible PCs. There’s also support for AMD FreeSync Premium Pro as well as NVIDIA G-Sync like most of the best gaming TVs have.
Their product quality has been decimated from where it was 10 years ago. I actively avoid them when shopping for TVs (and especially appliances) now.