Your graphics card is a piece of crap. That said, for the time being shut off "heat blur" in the options menu. Off! Off!
Set your res at 1024 x 768. Don't get greedy. And shut off anti-aliasing and anistropic filtering in your graphics card menu.
Your machine is as good as mine (except for your puny graphics card) and I get smooth frames in combat.
Acer: XB 280HK 28" 3840 X 2160, 1ms, w/Nvidia GSync
Corsair: White Graphite 760T Full Tower
Corsair: 16GB Vengeance LPX 2800MHz RAM
Corsair: SP2500 2.1 Gaming Speaker System
INTEL: Six-Core, i7 5820K CPU @4.2Hz
ASUS RTX OC 2080
Logitech 920 Wheel and Pedal System with Wheel Stand Pro
Saitek Pro Flight Control System with Wheel Stand Pro
Saitek X55 HOTAS
XBOX One S
Track IR5
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