Core i9-10900K can boost to 5.3 GHz, more specifications of 10th Gen Core Comet Lake-
Intel Core i9-10900K is official, boosting up to 5.3 GHz; Core i7 and Core i5 get competitive against Ryzen | TechSpot
The Intel Comet Lake Core i9-10900K, i7-10700K, i5-10600K CPU Review: Skylake We Go Again
Intel Core i9-10900K hands out huge Time Spy CPU Score but gets unsurprisingly left far behind by AMD Ryzen 9 3950X in Cinebench R15 multi-core comparison - NotebookCheck.net News