Core 2 Quad Q8400 vs Core i5-13400F

The Core 2 Quad Q8400 packs 4 cores / 4 threads, while the Core i5-13400F offers 10 cores / 16 threads — the Core i5-13400F has 6 more cores. Boost clocks reach 0.67 GHz on the Core 2 Quad Q8400 versus 4.6 GHz on the Core i5-13400F — a 149.1% clock advantage for the Core i5-13400F (base: 2.66 GHz vs 2.5 GHz). The Core 2 Quad Q8400 uses the Yorkfield (2007−2009) architecture (45 nm), while the Core i5-13400F uses Raptor Lake-S (2023−2024) (Intel 7 nm). In PassMark, the Core 2 Quad Q8400 scores 2,076 against the Core i5-13400F's 25,029 — a 169.4% lead for the Core i5-13400F. Cinebench R23 multi-core: 852 vs 16,211 (180% advantage for the Core i5-13400F). Geekbench 6 single-core — the metric most relevant to gaming — records 369 vs 2,407, a 146.8% lead for the Core i5-13400F that directly translates to higher frame rates. Multi-core Geekbench: 1,155 vs 11,408 (163.2% advantage for the Core i5-13400F). L3 cache: 0 kB on the Core 2 Quad Q8400 vs 20 MB (total) on the Core i5-13400F.

The Core 2 Quad Q8400 uses the LGA775 socket (PCIe 1.1), while the Core i5-13400F uses LGA1700 (PCIe 5.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3 1333 MHz on the Core 2 Quad Q8400 versus DDR5-4800, DDR4-3200 on the Core i5-13400F — the Core 2 Quad Q8400 supports 199.9% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i5-13400F supports up to 192 GB of RAM compared to 16 GB — 169.2% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 0 (Core 2 Quad Q8400) vs 20 (Core i5-13400F) — the Core i5-13400F offers 20 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 H610,B660,H670,Z690,B760,H770,Z790 (Core i5-13400F).

Neither processor supports overclocking. Virtualization support: true (Core 2 Quad Q8400) vs VT-x, VT-d (Core i5-13400F). Primary use case: Core 2 Quad Q8400 targets Desktop, Core i5-13400F targets Gaming. Direct competitor: Core i5-13400F rivals Ryzen 5 7600.

The Core 2 Quad Q8400 launched at $183 MSRP, while the Core i5-13400F debuted at $196. At current prices ($128 vs $180), the Core 2 Quad Q8400 is $52 cheaper. In terms of value (PassMark points per dollar), the Core 2 Quad Q8400 delivers 16.2 pts/$ vs 139.1 pts/$ for the Core i5-13400F — making the Core i5-13400F the 158.2% better value option.