Jason Xie, Intel’s Gaming Technical Marketing Lead, provides a live demonstration of an unnamed desktop processor from the Raptor Lake series. Despite his refusal to name the processor, it is clear at this point that the CPU in question is a Core i9-13900KS.
The CPU is shown running on both Intel reference and commercially available ASUS Z790 motherboards. The system is cooled by an off-the-shelf Corsair AIO liquid cooler, so there is no need for a chiller in this demonstration.
The Intel XTU (Extreme Tuning Utility) and HWiNFO screens are shown, demonstrating that no ‘tricks’ were used in the background 7zip benchmark demo.
The Core i9-13900KS clocks in at 6.0 GHz. Intel is the source.
The CPU can reach 5.985 GHz when two cores are active, but the frequency is not constant. According to Jason, the frequency will be determined by a variety of factors, including the power budget, thermal conditions, and the software itself.
Previous rumours suggested that the i9-13900KS CPU would be available as early as January 12th. This was indicated by leakers as well as a number of retailers who placed their listings earlier. Unfortunately, this has yet to be confirmed. Furthermore, the cost of this processor is currently unknown.

Sneak Peek at Intel Technology: 6 GHz Intel Core Out-of-the-Box Demo