Core 2 Quad Q8400 vs Core i5-10400F

The Core 2 Quad Q8400 packs 4 cores / 4 threads, while the Core i5-10400F offers 6 cores / 12 threads — the Core i5-10400F has 2 more cores. Boost clocks reach 0.67 GHz on the Core 2 Quad Q8400 versus 4.3 GHz on the Core i5-10400F — a 146.1% clock advantage for the Core i5-10400F (base: 2.66 GHz vs 2.9 GHz). The Core 2 Quad Q8400 uses the Yorkfield (2007−2009) architecture (45 nm), while the Core i5-10400F uses Comet Lake (2020−2025) (14 nm). In PassMark, the Core 2 Quad Q8400 scores 2,076 against the Core i5-10400F's 13,029 — a 145% lead for the Core i5-10400F. Cinebench R23 multi-core: 852 vs 8,191 (162.3% advantage for the Core i5-10400F). Geekbench 6 single-core — the metric most relevant to gaming — records 369 vs 1,454, a 119% lead for the Core i5-10400F that directly translates to higher frame rates. Multi-core Geekbench: 1,155 vs 5,783 (133.4% advantage for the Core i5-10400F). L3 cache: 0 kB on the Core 2 Quad Q8400 vs 12 MB (total) on the Core i5-10400F.

The Core 2 Quad Q8400 uses the LGA775 socket (PCIe 1.1), while the Core i5-10400F uses LGA1200 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3 1333 MHz on the Core 2 Quad Q8400 versus DDR4-2666 on the Core i5-10400F — the Core i5-10400F supports 100% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i5-10400F supports up to 128 GB of RAM compared to 16 GB — 700% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 0 (Core 2 Quad Q8400) vs 16 (Core i5-10400F) — the Core i5-10400F offers 16 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Intel P45,Intel G41,Intel Q45,Intel X48,Intel G31 (Core 2 Quad Q8400) and H410,B460,H470,Z490,H510,B560,H570,Z590 (Core i5-10400F).

Neither processor supports overclocking. Virtualization support: true (Core 2 Quad Q8400) vs VT-x, VT-d (Core i5-10400F). Primary use case: Core 2 Quad Q8400 targets Desktop, Core i5-10400F targets Gaming. Direct competitor: Core i5-10400F rivals Ryzen 5 3600.

At launch, the Core 2 Quad Q8400 was priced at $183, while the Core i5-10400F came in at $160. On launch pricing ($183 vs $160), Core i5-10400F was $23 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core 2 Quad Q8400 delivers 11.3 pts/$ vs 81.4 pts/$ for the Core i5-10400F — making the Core i5-10400F the 151.1% better value option.

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