The Intel Core i9-9900K, the last-gen flagship processor, has now officially been discontinued, along with the entire 9th-gen Coffee Lake Refresh range.

The ‘product discontinuance program’ actually kicked off December 7, although the last order date for 9th-gen CPUs doesn’t come until June 25, 2021, with the final shipments happening a year from now, on December 24, 2021.

In other words, Core i9-9900K chips aren’t going to disappear overnight, and will still be available for a while yet. But if you want one, you might want to move sooner rather than later.
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https://www.techradar.com/news/intel-core-i9-9900k-has-been-discontinued-along-with-other-9th-gen-cpus