Hi Bruce, its easy to confirm if you are getting the benefit of your Nvenc gpu rendering, it should be several times faster to render.
If it is rendering a lot faster using Nvenc for similar data rates vs Mainconcept without Nvenc then no issue. You can compare the quality to see if it’s acceptable.
Nvenc rendering uses a purpose built chip called an asic on your gpu to do Nvenc, because the grunt work is offloaded to this chip your overall gpu usage may look quite low, also the gpu and cpu temps will be lower.