Need a new cpu to run Premiere

Hi everyone. I am looking for a new cpu that would run Premiere smoothly. I am currently on windows 10 but may have to switch to a mac (have to do Apple ProRez delivery's). The Mac Pro (trash can style) is just too expensive, and the mac mini is probably too slow so I was looking at an iMac. But a lot of what the affordable models have only have is an i5 processor. Would Premiere still run smoothly with something like that especially if I am editing 4k footage. Any advice would really be appreciated.

[Moved to the Hardware Forum.]