I tried to explain that most settings will impact both. The reason is for example, if you raise the LOD, you need more computation to calculate it, and more GPU to display them. The lens bloom or the more detailed clouds need to be calculated, rendered and displayed too. That’s with most settings, excluding some very obvious ones. The link I shared has advice for sorting out both shortages.
There was a good thread testing each and every setting, but hasn’t been refreshed since SU5 and the sim is changing very fast, so of little use.
Hope you find what you’re looking for.