TechPowerUp published Intel Core i9-12900K Single-Thread Performance Allegedly 27% Faster Than Ryzen 9 5950X A quote from the article:

The upcoming flagship Intel Core i9-12900K has recently appeared in a CPU-Z single-thread synthetic benchmark where the processor scored 825 points. This would place the i9-12900K 27% higher than AMD Ryzen 9 5950X with 648 points and 20% faster then the previous generation Core i9-11900K at 682 points. This leak comes after SiSoftware published an early performance overview which showed the i9-12900K only matching the performance of competitors. We have also seen the processor in Cinebench R23 where it bested the 32-core AMD Ryzen Threadripper 2990WX HEDT processor. The 12th Generation Intel Core family is expected to be announced later this year alongside the Z690 chipset with the i9-12900K rumored to cost 604.99 USD.

  Intel Core i9-12900K Single-Thread Performance Allegedly 27% Faster Than Ryzen 9 5950X