Just curious to see if anyone's 2019 iMac with an i5-9600K or i9-9900K has come with the newest R0 stepping which includes a few extra hardware fixes for various security vulnerabilities (e.g. additional Spectre variants, Fallout etc.). The earlier P0 stepping will still get software fixes for these See: https://www.intel.com/content/www/u...ngineering-new-protections-into-hardware.html The original P0 stepping 9th Gen CPUs will be labelled as "Intel64 Family 6 Model 158 Stepping 12" while the newer R0 will have "Stepping 13". Intel's CPUID tool (https://software.intel.com/en-us/download/download-maccpuid) or a standard terminal command will reveal this info. Terminal command: sysctl -a | grep machdep.cpu I just purchased an i5-9600K iMac (thanks to all on this forum who provided detailed performance info and screenshots before I purchased one myself!). Mine was from a retailer and is a Stepping 12 (P0).