Core i5-13600K vs Core i5-8400H

The Core i5-13600K packs 14 cores / 20 threads, while the Core i5-8400H offers 4 cores / 8 threads — the Core i5-13600K has 10 more cores. Boost clocks reach 5.1 GHz on the Core i5-13600K versus 4.2 GHz on the Core i5-8400H — a 19.4% clock advantage for the Core i5-13600K (base: 3.5 GHz vs 2.5 GHz). The Core i5-13600K uses the Raptor Lake, Raptor Cove, Gracemont (2022) architecture (Intel 7 nm), while the Core i5-8400H uses Coffee Lake-H (2018−2019) (14 nm). In PassMark, the Core i5-13600K scores 37,655 against the Core i5-8400H's 7,456 — a 133.9% lead for the Core i5-13600K. L3 cache: 24 MB on the Core i5-13600K vs 12 MB (total) on the Core i5-8400H.

The Core i5-13600K uses the LGA1700 socket (PCIe 5.0), while the Core i5-8400H uses BGA1440 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR5-5600 on the Core i5-13600K versus DDR4 2666 MHz on the Core i5-8400H — the Core i5-8400H supports 200% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i5-13600K supports up to 192 GB of RAM compared to 64 GB — 100% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 20 (Core i5-13600K) vs 16 (Core i5-8400H) — the Core i5-13600K offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Intel 600 series,Intel 700 series (Core i5-13600K) and Intel HM370,Intel QM370 (Core i5-8400H).

Only the Core i5-13600K has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Virtualization support: VT-x, VT-d (Core i5-13600K) vs true (Core i5-8400H). Both include integrated graphics — UHD Graphics 770 (Core i5-13600K) and Intel UHD Graphics 630 (Core i5-8400H) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i5-13600K targets Desktop, Core i5-8400H targets Mobile.