you could get a usb audio adapter like this if you want something cheap and easy https://www.amazon.com/UGREEN-External-Headphone-Microphone-Desktops/dp/B01N905VOY/ref=sr_1_1_sspa?s=pc&ie=UTF8&qid=1550675667&sr=1-1-spons&keywords=usb+audio+adapter&psc=1
That's ridiculous. There's really not that much difference in performance between a R9 290 and a GTX 1060/RX 580.
To use MSI Afterburner...
Install MSI Afterburner: https://www.msi.com/page/afterburner
Enable the On Screen display (Settings > On Screen Display)
Set a keybinding to toggle On Screen Display on/off
Assign what you want to be shown on the On Screen Display (Settings > Monitoring).
If not already selected, select CPU Usage %, GPU Usage %, CPU Temperature, GPU Temperature
Play the game and use the keybinding set in Step 3 to enable the on screen display in game
Take a screenshot of what it's displaying and post it here
Your 4770k and R9 290 might be overheating. Open the side panel of the computer (the big box part) and inspect the coolers for dust build up. If dust is present, remove dust by spraying it with compressed air (do this outside).