Damn there are some good 5Ghz+ voltages in this thread. A lot of the youtube reviewers needed 1.35V+ for 5Ghz stable, much like many 8700k's (mine included). I really hope my 9900k will do 5Ghz under 1.30V in my custom loop. Hoping to keep the temperatures reasonable since it will be sharing a loop with a 2080Ti (two 360 rads).
System Specs: Lian Li PC-011 Dynamic - ROG Maximus X Code - Watercooled Intel 8700k (5Ghz) - Watercooled Strix GTX 1080Ti OC (2050-2063Mhz) - G. Skill Trident Z RGB 3200Mhz 32GB - Seasonic X-1050W PSU - Intel 600P NVME SSD