Core i9-10900K vs Core i9-11900KB

The Core i9-10900K packs 10 cores / 20 threads, while the Core i9-11900KB offers 8 cores / 16 threads — the Core i9-10900K has 2 more cores. Boost clocks reach 5.2 GHz on the Core i9-10900K versus 4.9 GHz on the Core i9-11900KB — a 5.9% clock advantage for the Core i9-10900K (base: 3.7 GHz vs 3.3 GHz). The Core i9-10900K uses the Comet Lake (2020−2025) architecture (14 nm), while the Core i9-11900KB uses Tiger Lake-H (2021) (10 nm SuperFin). In PassMark, the Core i9-10900K scores 22,382 against the Core i9-11900KB's 22,693 — a 1.4% lead for the Core i9-11900KB. L3 cache: 20 MB (total) on the Core i9-10900K vs 24 MB (total) on the Core i9-11900KB.

The Core i9-10900K uses the LGA1200 socket (PCIe 3.0), while the Core i9-11900KB uses FCBGA1787 (PCIe 3.0) — making them incompatible on the same motherboard. Both support up to DDR4-2933 memory speed. Both support up to 128 GB of RAM. Both feature 2-channel memory with ECC support. PCIe lanes: 16 (Core i9-10900K) vs 20 (Core i9-11900KB) — the Core i9-11900KB offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Intel 400 series (Core i9-10900K) and Mobile (Core i9-11900KB).

Both processors feature an unlocked multiplier for overclocking. Only the Core i9-11900KB supports AVX-512 instructions — important for machine learning and scientific applications. Both support VT-x, VT-d virtualization. Both include integrated graphics — UHD Graphics 630 (Core i9-10900K) and Intel UHD Graphics (Core i9-11900KB) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i9-10900K targets Desktop.

The Core i9-10900K launched at $499 MSRP, while the Core i9-11900KB debuted at $539. At current prices ($500 vs $350), the Core i9-11900KB is $150 cheaper. In terms of value (PassMark points per dollar), the Core i9-10900K delivers 44.8 pts/$ vs 64.8 pts/$ for the Core i9-11900KB — making the Core i9-11900KB the 36.6% better value option.