Symbiode

@Symbiode
 
Yeah, what Darkseth said, it looks like you are bottle necked by lack of ram so you should get another 8 gbs of ram and cut on free sync if you have that kind of monitor. If you don't, then you can turn on 'enhanced sync' in the Radeon software. It serves the same purpose as free sync, and solves the stuttering & screen tearing that occurs due to your frame time not syncing with your monitors refresh rate. I use it in all games, it works. Just don't turn on v-sync in the game menu. 
 

Well, because fps has nothing to do with how smooth the Game runs 😉
Frametimes are important. How do they look? 
Is your GPU usage at 100%?
 
If you have only 8gb Ram, and the Game alone uses 7gb.. Yeah, you don't have nearly enough Ram. Or how much gb does the COD.exe use up during playing?
 
Which Monitor do you have (Refresh rate)? Is V-Sync on or off? Or does it have Freesync?

I've heard that hammers are an effective, if somewhat of a permanent, option.

Ryzen 3 will come next year, and it most likely support your motherboard. AMD promised the first gen motherboard will have cpu support till 2020.
I say go buy a 2600, it will still be decent for 5 years.
CPU has reach its maximum ceiling speed, the only way to have more performance is to add multiple cores.
And a 6 core will still be relevant 5 years later.
 

Aorus is Gigabyte, not Asus.
I don't think there's ever been a CPU socket that has supported a CPU for 5 years. You're still better off just getting Ryzen and upgrading as they come. 4th gen Ryzen will last a really long time probably.

Any brand new Ryzen 5/7 or Intel i5/i7 you purchase now will hold you over for the next 7 or 8 years I would imagine. There are still lots of PC's online that use the i7 2600k and AMD's FX series. If you want to go AMD I recommend a Zen+ cpu over Zen.