I am using an i9-7900x with 10 cores given to Cubase. The advantage of 10 is that it leaves the eleventh core available to the notorious nVidia card interrupt in a way that does not glitch Cubase. nVidia seems to prefer core 0 but will settle for core 10. Cubase seems to require core 0 be included in its allotment, although I have not investigated that very far. While Cubase running alone does not justify an i9 over other processors, the advantage to me is that I can simultaneously run Cubase and various video editing programs with outstanding performance on both. It’s quite a luxury to do that as it allows me to quickly edit either the music track or the video cuts to take best advantage of both even with full resolution, un-bounced video files. In general video editors work a little better with nVidia cards than others, although that is slowly changing.