Core i9-11900KF vs Core Ultra 7 155H

The Core i9-11900KF packs 8 cores / 16 threads, while the Core Ultra 7 155H offers 16 cores / 22 threads — the Core Ultra 7 155H has 8 more cores. Boost clocks reach 5.2 GHz on the Core i9-11900KF versus 4.8 GHz on the Core Ultra 7 155H — a 8% clock advantage for the Core i9-11900KF (base: 3.5 GHz vs 3.8 GHz). The Core i9-11900KF uses the Rocket Lake (2021) architecture (14 nm), while the Core Ultra 7 155H uses Meteor Lake-H (2023) (7 nm). In PassMark, the Core i9-11900KF scores 24,585 against the Core Ultra 7 155H's 24,705 — a 0.5% lead for the Core Ultra 7 155H. Cinebench R23 multi-core: 15,500 vs 17,650 (13% advantage for the Core Ultra 7 155H). L3 cache: 16 MB (total) on the Core i9-11900KF vs 24 MB (total) on the Core Ultra 7 155H.

The Core i9-11900KF uses the LGA1200 socket (PCIe 4.0), while the Core Ultra 7 155H uses FCBGA2049 (PCIe 5.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-3200 on the Core i9-11900KF versus LPDDR5x-7467, DDR5-5600 on the Core Ultra 7 155H — the Core Ultra 7 155H supports 22.2% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i9-11900KF supports up to 128 GB of RAM compared to 96 GB — 28.6% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 20 (Core i9-11900KF) vs 28 (Core Ultra 7 155H) — the Core Ultra 7 155H offers 8 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Z590,B560 (Core i9-11900KF) and Meteor Lake SoC (Core Ultra 7 155H).

Only the Core i9-11900KF has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Only the Core i9-11900KF supports AVX-512 instructions — important for machine learning and scientific applications. Virtualization support: VT-x, VT-d (Core i9-11900KF) vs VT-x, VT-d, EPT (Core Ultra 7 155H). The Core Ultra 7 155H includes integrated graphics (Intel Arc Graphics (8 Xe-cores)), while the Core i9-11900KF requires a dedicated GPU. Primary use case: Core Ultra 7 155H targets Thin-and-light Performance / AI. Direct competitor: Core Ultra 7 155H rivals Ryzen 7 8840HS.