Need help with "low" fps with High-end pc in certain games.

[Frehgin]

Hi! I have fps issues in certain games I'd like some help with.

 

Here are my specs:

 

Windows 10 20H2 (19042.870)

MSI Z370 GAMING PRO CARBON (latest bios)

Intel Core i7-8700K @4.7 all cores (unparked)

Corsair iCUE h150i blabla

G.SKILL F4-3200C14D 2x8GB @3200mhz CL14 (xmp enabled)

RTX 3080 Msi gaming x trio (461.92)

Benq Zowie xl2546k @240hz

 

Games that work as I'd like to:

Doom: Eternal; 97-99% gpu usage and about 300fps @1080p

Warframe: CPU Bottlenecked all cores running around 80-90%, 300 to 500fps @1080p (then I cap at 240)

 

Games with weird behaviour:

GTA V (Dx11), whatever I throw at it, medium, high, ultra settings, 1080p, 1440p(dsr), 4k(dsr) I will alway get between 80-100 fps, with 30-40 gpu usage, and 40-50 cpu usage (no single core maxing out)

Deep Rock Galactic (Dx12), Will not reach 240fps in the main hub even though GPU usage is 50% and CPU only have 3-4 cores active at around 60%. Lower FPS in Dx11.

 

I really don't know what to do. Are the games just poorly optimized?