An i5, 8th gen or newer will work fine with this. Since it has six cores. I know my low end, 8th gen i5 has no issue with fifteen cameras at 15FPS. Ten 1500P 3MP, three 1500P 4MP, and two 720P 2MP.
Heck even my old 3rd gen i5 works with this. My backup BI machine. But the CPU usage is very high...