[SOLVED] In game stutter lag (frame time spikes), help!

[Asteck]

Very new PC, my first time building actually.

CPU: Ryzen 3 1200
GPU Radeon RX 580 8GB
RAM: Corsair Vengeance LPX 2x8GB 3000MHz
MOBO: ASUS Prime B450M-A Micro ATX
Storage: Gigabyte 2.5" 240GB SSD
PSU: Thermaltake 550W
Monitor: MSI Optix G24 75Hz 1920x1080 Freesync ready

On Rainbow Six Siege I experience large stutters, the more I move. I haven't overclocked.
On CS:GO I don't stutter as I move, rather all other players stutter around me.
I have ran MSI Afterburner (RivaTuner) and it shows frame time jumps. But on Heaven Benchmark is runs fine (I assume that's because there is little movement across the screen).

Lowering settings doesn't seem to do it.
Changing to 60Hz in game doesn't do it.
Playing borderless or full screen doesn't change it.

Not sure how to fix this. Maybe it is because I have done something wrong or not installed something whilst building the PC?

 

[Nemesia]

I see you only have 1 240GB SSD in your system. How full is that drive at the moment?

 

[Asteck]

I see you only have 1 240GB SSD in your system. How full is that drive at the moment?

85 GB is still free

 

[Asteck]

UPDATE: My clock speed should be at 1350MHz like it does on CS, this issue with CS is the dodgy ethernet cable I think.
On siege it is locked at 300MHz using 5x less power.... how do I unlock this then?

My GPU Clock and Memory are locked at 300MHz. How do I unlock this as it shows on Minecraft and Siege but not CS

 

[Asteck]

I fixed it! Not sure how, I changed my power plan to balanced, did a windows update (a feature update) and played with MSI afterburner beforehand (didn't fix it though), after the restart it works. One of those things or the restart itself after playing with afterburner fixed it!