How can i tell if my cpu is bottlenecking my system? I have a 3930k and 2 1080ti, and i think my CPU is having issues handling that, just based on FPS, is there a way to really tell?
Look at CPU usage. Normal scenario is GPU(s) at 100% and CPU somewhere under 100%. If your CPU is at 100% and your GPU(s) are under 100%, your CPU is bottlenecking the system.
Another way to tell is to downclock your CPU by 100 or 200 Mhz. Then run your games, and see if the FPS drops.
This may, of course, depend on the games that you play. Check online to see if the games that you play are CPU bound or GPU bound. A CPU bound game will show 100% CPU usage, and slow down with downclocking. A GPU bound game may not slow down if you downclock your CPU, it depends.
I don't trust CPU usage. I can play on the same game map with 64 players and one time run 100% CPU and another time run ~80% CPU. The best way to tell is down clock the CPU and see if you loos any FPS.
Here you can see GPU2 at 96% for a while and GPU1 at 65% for a while
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