Maybe this is a part of the pro-level iMac Apple plans to introduce later this year. Anthony Leather:
Once again, in multi-threaded applications, AMD is looking extremely strong and usually has a good lead on the far more expensive Intel Core i7-7700K. The Intel CPU sports a higher clock speed, but only has four physical cores and eight threads, compared to the six cores and 12 threads of the AMD Ryzen 5 1600. The AMD CPU costs $219, while on Newegg today the Intel CPU will set you back $350.
A faster, less expensive iMac? I’ll wait.