https://wccftech.com/intel-core-i9-9990xe-14-core-5-ghz-x299-lga-2066-cpu-rumor/

Intel may possibly prepare a new flagship entrant in their Core-X HEDT lineup known as the Core i9-9990XE. The new processor details have been shared by Anandtech which states that this high-end premium offering may be the fastest clocked Core-X chip designed to date, featuring clocks as high as 5.0 GHz.

Now if such a processor actually launches, it would be the eight SKU in the crowded Core-X 9th Gen family. While the Core i9-9980XE is the flagship with 18 cores, the Core i9-9990XE would be featuring a higher SKU naming scheme while rocking 14 cores. The full specifications for this chip include 14 cores and 28 threads. These are 4 fewer cores and 8 fewer threads than the 9980XE CPU but the clock speeds are much faster on this part.