Bitrate 64, buffer 1? Where did you get those settings? That isn't going to work.
Likewise, you're on a 'budget' CPU... might be able to handle what you're trying to do, at the resolution you're using, but it's going to be difficult... might even have to go to Ultrafast.
I'd also drop your audio to 96kbps AAC, 160 is absolutely unnecessary and wastes bandwidth.
Your bitrate setting is almost definitely your problem though.
Head here:
https://obsproject.com/estimator
Remember that it's expecting kbps, not mbps. 1000kbps = 1mbps. So is the OBS settings menu.