I would like to upgrade the CPU of my mid 2017 imac 5k retina (3.8 GHz Intel Core i5 with Radeon Pro 580 8192 MB) to the i9 9900k or 9900kf cpu. Is this possible? I believe that the pinout for both these chips is the same, but I’m not sure if the chipset will accept the new cpu and whether my current motherboard will be able to utilize the full power of i9 and the OS will be able to handle it.