Based on your CPU/GPU and an educated guess, try starting out with:
Base 1920x1080
Output 1280x720
FPS 60
Lanczos
Output (Advanced) | Streaming
Encoder NVENC H.264
Rate Control CBR
Bitrate 2500-3500
Keyframe 2
Everything else default
Try NVENC first to reduce CPU load. Then try x264.
In CSGO, you may have to lower settings to medium quality in video settings to get the higher FPS.
