Core i9-12900KS vs Core i5-10400F

The Core i9-12900KS packs 16 cores / 24 threads, while the Core i5-10400F offers 6 cores / 12 threads — the Core i9-12900KS has 10 more cores. Boost clocks reach 5.3 GHz on the Core i9-12900KS versus 4.3 GHz on the Core i5-10400F — a 20.8% clock advantage for the Core i9-12900KS (base: 3.4 GHz vs 2.9 GHz). The Core i9-12900KS uses the Alder Lake-S (2022) architecture (Intel 7 nm), while the Core i5-10400F uses Comet Lake (2020−2025) (14 nm). In PassMark, the Core i9-12900KS scores 43,528 against the Core i5-10400F's 13,029 — a 107.9% lead for the Core i9-12900KS. Cinebench R23 multi-core: 27,796 vs 8,191 (109% advantage for the Core i9-12900KS). Geekbench 6 single-core — the metric most relevant to gaming — records 2,082 vs 1,454, a 35.5% lead for the Core i9-12900KS that directly translates to higher frame rates. L3 cache: 30 MB (total) on the Core i9-12900KS vs 12 MB (total) on the Core i5-10400F.

The Core i9-12900KS uses the LGA1700 socket (PCIe 5.0), while the Core i5-10400F uses LGA1200 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR5-4800 on the Core i9-12900KS versus DDR4-2666 on the Core i5-10400F — the Core i9-12900KS supports 22.2% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 128 GB of RAM. Both feature 2-channel memory with ECC support. PCIe lanes: 20 (Core i9-12900KS) vs 16 (Core i5-10400F) — the Core i9-12900KS offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: LGA1700 (Core i9-12900KS) and H410,B460,H470,Z490,H510,B560,H570,Z590 (Core i5-10400F).

Only the Core i9-12900KS has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Only the Core i9-12900KS supports AVX-512 instructions — important for machine learning and scientific applications. Both support VT-x, VT-d virtualization. The Core i9-12900KS includes integrated graphics (UHD 770), while the Core i5-10400F requires a dedicated GPU. Primary use case: Core i5-10400F targets Gaming. Direct competitor: Core i5-10400F rivals Ryzen 5 3600.

The Core i9-12900KS launched at $739 MSRP, while the Core i5-10400F debuted at $160. At current prices ($385 vs $102), the Core i5-10400F is $283 cheaper. In terms of value (PassMark points per dollar), the Core i9-12900KS delivers 113.1 pts/$ vs 127.7 pts/$ for the Core i5-10400F — making the Core i5-10400F the 12.2% better value option.