Intel’s 12th Gen Alder Lake-S flagship, the Core i9-12900K was spotted on the Basemark benchmarking database, paired with a GeForce RTX 3080/3070 and a B660 /Z690 motherboard. Two entries of the processor have surfaced, one from May and a more recent one from July. The former appears to be an engineering sample with the latter being a qualification sample. As expected, the older sample is running at significantly lower clocks than its mature sibling, resulting in mediocre performance.
The Qualification Sample, on the other hand, (almost) levels with the Ryzen 9 5900X despite having lower clocks. It’s worth noting that the benchmarking utility detects both processors as 12-core parts, although from what we’ve heard, they’re expected to feature a total of 16 cores (8 high-performance and 8-efficiency cores).
This data doesn’t give us much to go on as the boost clocks are not visible, but I’d say that you can expect the final retail chips to be at least 10-15% faster than their Ryzen counterparts in most workloads.