i have the evga ftw 570, im trying to decide between a 5800x3d and a 5900x, or spending another 400 on a 7900x system upgrade. im more concerned about the 1 percent lows with the 5900x. i use a 3840x1600 screen. and also concerned about the 5800x3d being slower for applications. any advice would be helpful thanks

Pretty much what the comment above me says, you must decide if you want a multitask CPU or a gaming CPU. At the same time the former can be OC-ed, the latter not really.

Well, I mean with a 13700k you'd need a platform upgrade so more cost. You already have the X570 ftw so the 5900X would be a drop in upgrade. You also play at a high resolution so you're basically going to be GPU limited between the high resolution and if you run games at a high-ultra settings. I play with a 5900X and a 7900XT on 1440p and get great performance that's pretty consistent, and im still primarily GPU limited. So, in your case, if you wanna save a little money go for the 5900X - you'll be fine. Just my 2¢.