is ryzen 7 work fine with unreal engine? is ue4 has a feature that only work with intel?
or i7 9700k is fine? from what I know its doesn’t have intel hyper threading feature, how much this affect ue4?
and is rx570 is fine? at least at 30fps for working in editor?
thanks 
I was weeks and weeks between i9 9900k and 3700x and decided to go with 3700x for lower power consumption and cheaper cost and almost same performance as i9 9900k. Ordered previous gen x470 Aorus Gaming 7 as i do not need pcie4 and cost is lower too for previous hi-end motherboards. Had RX 470 and Editor worked fine so with RX570 it will be fine too.
Check tons of reviews and do not rely only some review, watch youtube tests between 9900k and 3700x
With the savings purchasing 3700x instead of i9 9900k you can get a better graphics card! Even thou you will get more than 30fps while in editor, because the GPU is good enough for 1080p.
UE4 works perfectly with AMD CPUs and you benefit a lot from more cpu cores in several tasks.
The ultimate setup would vary depending on what you are going to work with UE4, but up to now the hints you received are solid on most cases.
I’m using an I9 9900K And it’s worrking great - really fast! - Like 2x or more times faster than my old I7 4770K. But I’ve never used AMD so I can’t compare. Hope ya find the right CPU for you! 