I found a Optiplex 990 MT Core i5 2400 3.10 GHz for cheap so I decided to upgrade it to gaming rig. I upgraded the graphics card to a RX 570, now I have noticed the huge CPU bottleneck as it would reach 100% and my GPU reaching 40%-50% while gaming. I'm wondering if my CPU is under performing. If so how would I fix it or should I buy a new one. Thanks for listening.