Many 4K inputs are limited to 30 FPS so there's that. ASK the maker to tell more about the 4K 30 FPS issue.
https://www.google.com/#q=4k%2030hz%20gaming in case you missed it.
There's also the issue of GPU horsepower for 4K gaming. Read these 2.
And we didn't broach the old input lag issue. For me I'm back to 1080 and checking that lag.
I'm looking to get a new TV and can't decided between these 2. I'm looking for a TV that can handle online gaming, and the reviews of these TVs are scarce.
The main difference between these 2 is the LG is an entry level 4k TV and the Samsung is a 5 series full HD TV. I can't find a review anywhere for the Samsung, and their site doesn't even list it. It's for sale on the Curry's site.
Does anyone have any experience with either and whether the LG can actually handle online gaming to a decent level? It doesn't have to be amazing, and the added advantage of 4k is appealing.
Any advice would be greatly appreciated.