BTW, I've tested iRacing more thoroughly in an AI race (yeah, I know, not the usual scenario still, but best I could do). It used one thread extensively, and then two more somewhat (like to a quarter or so). Then a bunch of other threads not worth mentioning.
So essentially, you would not see much of a difference running the game just on two cores (threads)...
If he's getting 12-25 fps more and everything else is the same, then sure, he is getting somewhat better CPU performance (which is still more or less to be expected with Intel vs AMD when it comes to gaming, meaning a very single-threaded task, even with the newer 3xxx Ryzens), and yeah, both of you are likely CPU limited. But to know how much better and if it's even worth it, we would also need to know the absolute numbers. You might, for example, still be better off if you capped your framerate at a lower value than a maximum you can achieve. Framerate alone isn't everything.
So essentially, you would not see much of a difference running the game just on two cores (threads)...
You should certainly see lower GPU usage than him in the same resolution with roughly the same framerate, because, again, you have a GPU that's a bit more powerful than his.As we are both running on Triple Screen, 5760x1080, I would expect more GPU usage on my side. Also, he is getting about 15-25 fps more than me, so I was thinking is due to CPU bottle-necking my GPU. But as I said, this only happens on iRacing, probably due to its ancient engine. Modern games i have better performance than him or the same.
If he's getting 12-25 fps more and everything else is the same, then sure, he is getting somewhat better CPU performance (which is still more or less to be expected with Intel vs AMD when it comes to gaming, meaning a very single-threaded task, even with the newer 3xxx Ryzens), and yeah, both of you are likely CPU limited. But to know how much better and if it's even worth it, we would also need to know the absolute numbers. You might, for example, still be better off if you capped your framerate at a lower value than a maximum you can achieve. Framerate alone isn't everything.