97% CPU, Computer Not Responding

Jul 2, 2018
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I have Amd RX 580 with a Ryzen 3 1200, when I’m playing fortnite and streaming on SLOBS...my computer becomes so unresponsive when I click onto my 2nd monitor, when looking at the CPU usage in Task Manager, I’m using 97-98%...and the gameplay on main monitor with fortnite becomes slightly laggy etc...do I need to upgrade the CPU?