It's not uncommon for MOBO's to do things like this. For example, my new MOBO's temperature sensors were showing 115-120 degrees celsius in monitoring programs, but it wasn't actually that temp. Sent it back and now it's fine.
Your FX-8350 would most likely bottleneck a GTX 1080TI. So my suggestion, depending on how urgent it is that you render whatever it is you want to render, just save up some more money, and then upgrade your CPU, MOBO, RAM & GPU all in one go.
1440p at 23.8 inches must be atrocious.
I'd just look for 1440p, 144Hz, 27" monitors. And if you're willing to dish out another $45-$50 you can get and IPS panel which will make a gigantic difference.
TN Panel...