First build

[JOETHEHOMIE5]

Budget (including currency): 900

Country: us

Games, programs or workloads that it will be used for: apex legends CSGO

Other details (existing parts lists, whether any peripherals are needed, what you're upgrading from, when you're going to buy, what resolution and refresh rate you want to play at, etc): 

https://pcpartpicker.com/list/kKZPp2

[Middcore]

3700X has no onboard graphics, and you don't have any type of GPU or display adapter on the list, so as it is this PC isn't even usable. 

[JOETHEHOMIE5]

Just now, Middcore said:

3700X has no onboard graphics, and you don't have any type of GPU or display adapter on the list, so as it is this PC isn't even usable. 

Oh sorry forgot to mention I already have a 1050 ti I will be putting in the system 

[Middcore]

Your case has a front USB-C port but your motherboard has no header for it, so you'd have to use adapters that would end up making some or all of the front USB work slower than its intended speed. 

 

I would tend to think you'd be better off to get a B550 board, and a 5600X, which would be at an advantage over the 3700X in games like CS:GO with its improved IPC and clock speeds. There's just no reason to go B450 in 2021 unless you're on a really tight budget.