https://www.techradar.com/news/intels-core-i9-9900k-flagship-rumored-to-hit-5ghz-boost-out-of-the-box

We’ve had some fresh leakage concerning Intel’s incoming 9th-generation processors (Coffee Lake Refresh), including the flagship Core i9-9900K, which will apparently be capable of boosting to 5GHz.

So first off, let’s state upfront that these CPU specs are only rumored details, so remember to treat them as such. They come from Coolaler, and they largely stack up with the speculation we’ve heard thus far, although there are some interesting differences.