Core i5-6400 vs Core i5-7400

Both the Core i5-6400 and Core i5-7400 share an identical 4-core/4-thread configuration. Boost clocks reach 3.3 GHz on the Core i5-6400 versus 3.5 GHz on the Core i5-7400 — a 5.9% clock advantage for the Core i5-7400 (base: 2.7 GHz vs 3 GHz). The Core i5-6400 uses the Skylake (2015−2016) architecture (14 nm), while the Core i5-7400 uses Kaby Lake (2016−2019) (14 nm). In PassMark, the Core i5-6400 scores 5,417 against the Core i5-7400's 5,477 — a 1.1% lead for the Core i5-7400. Geekbench 6 single-core — the metric most relevant to gaming — records 950 vs 1,215, a 24.5% lead for the Core i5-7400 that directly translates to higher frame rates. Multi-core Geekbench: 3,200 vs 3,517 (9.4% advantage for the Core i5-7400). Both processors carry 6 MB (total) of L3 cache.

Both processors use the LGA1151 socket with PCIe 3.0. Both support up to DDR4-2133 memory speed. Both support up to 64 GB of RAM. Both feature 2-channel memory with ECC support. Both provide 16 PCIe lanes. Chipset compatibility: H110,B150,H170,Z170 (Core i5-6400) and 100-series,200-series (Core i5-7400).

Neither processor supports overclocking. Both support VT-x, VT-d, EPT virtualization. Both include integrated graphics — Intel HD Graphics 530 (Core i5-6400) and HD Graphics 630 (Core i5-7400) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i5-6400 targets Mainstream Desktop, Core i5-7400 targets Gaming. Direct competitor: Core i5-7400 rivals Ryzen 3 3300X.

The Core i5-6400 launched at $182 MSRP, while the Core i5-7400 debuted at $294. At current prices ($57 vs $70), the Core i5-6400 is $13 cheaper. In terms of value (PassMark points per dollar), the Core i5-6400 delivers 95.0 pts/$ vs 78.2 pts/$ for the Core i5-7400 — making the Core i5-6400 the 19.4% better value option.