Re: 100% CPU usage- 30% GPU Usage.
What graphic settings do you run? While you have a powerful GPU it may be getting bottlenecked by your RAM and CPU - namely the CPU as it is below the minimum requirement albeit only barely and on 64 player servers 8 RAM can see marginal frame loss especially when a lot of players are close together. Closing any unneeded background programs and editing graphical settings to be less intensive could possibly help alleviate the issue.