Question about Elgato Game Capture 4K60 Pro MK.2

No, that never makes sense. Incidentally, I tried this once, and not only did it not help, but on the contrary, it put a much greater load on the PC. Record single PC directly with OBS.

In any case, the processor or the graphics card does the computing work. Otherwise the 4k60S+ but there is only FullHD or 4K and no 1440p. The card is there for recording or streaming from the console via OBS, if I understand your question correctly.