It will in some games but it will in all honesty probably be fine. The 6700K is a good CPU still although it's getting up there in age. The problem is that it's only a quad core and the quad Core CPU kind of overstayed its welcome. Some games require 6 cores/12 threads or even a bit extra. But for a kid they'll still enjoy it even if it's not getting the max fps it could possibly get in games like Battlefield V for example. As long as they're on 60hz it's a moot point anyway. This only matters for 120hz or above.