1. Right click on the shortcut, properties, advanced, check box, ok, apply, ok.
2. Do the same for your Elgato HD 60 S+.
Aaahm. Crazy values!
2560x720 doesn't make any sense. Its a screen ratio of 3,56:1 you should have seen this.
Go for 1920x1080 in
- Base resolution
- Output resolution
- Disable rescaling in the encoder settings
- If you just record, switch to CRF method in the encoder and go for target values between 23 and 20. Don't go for CBR with crazy values like 25.000 or 50.000. You don't have usable GPU.
If all that doesn't help, switch the output resolution to 1280x720.
And: qhobbes asked you how you start obs. That should help you find your shortcut in your windows system (possibly on desktop?). There you could have a mouse right-click to and choose "run as administrator". You may learn alot about obs and windows. =D
How do you open OBS?
Since your Elgato is outputting at 59.94 change your OBS FPS from 30 to 29.97.
Using ...
I admit I had not. Now I have and OBS gpu usuage is much better at teens%, not 95%-99%.1. Did you update Windows 10 to the newest available version?