Question PerfCap Idle, while playing Fortnite stretched

Mar 9, 2019
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So, hello Guys!

My Specs:
CPU: AMD Ryzen 7 2700x @ 4.00 GHZ
GPU: Inno3D GeForce GTX 1080Ti x2 (I dont run 2 of them, its just the name)
Mainboard: MSI Gaming Pro Carbon AC x470
RAM: 16GB DDR4 3200MHz Vengeance RGB

After running in Fortnite into some insane FPS problems, i started investigating and downloaded me stuff like MSI Afterburner and GPU-Z. I was wondering, why my GPU, even when i only have 100 FPS(I have a 144Hz Monitor)in Fortnite, my GPU Load is still under 50% and my CPU under 30%. After spending some time understanding GPU-Z, i looked into "PerfCap" and it says "Idle" http://prntscr.com/mviksv <-- While Playing. Why is my GPU Idling? Im playing 1079x1080 and my settings are all on low (Fortnite). How can i fix it? Please help me!

Nice Greets
rennox