Core i5-1145G7 vs Core i5-8400

The Core i5-1145G7 packs 4 cores / 8 threads, while the Core i5-8400 offers 6 cores / 6 threads — the Core i5-8400 has 2 more cores. Boost clocks reach 4.4 GHz on the Core i5-1145G7 versus 4 GHz on the Core i5-8400 — a 9.5% clock advantage for the Core i5-1145G7 (base: 2.6 GHz vs 2.8 GHz). The Core i5-1145G7 uses the Tiger Lake-UP3 (2020−2021) architecture (10 nm SuperFin), while the Core i5-8400 uses Coffee Lake-S (2017−2018) (14 nm). In PassMark, the Core i5-1145G7 scores 9,266 against the Core i5-8400's 9,229 — a 0.4% lead for the Core i5-1145G7. L3 cache: 8 MB (total) on the Core i5-1145G7 vs 9 MB (total) on the Core i5-8400.

The Core i5-1145G7 uses the FCBGA1449 socket (PCIe 4.0), while the Core i5-8400 uses LGA1151 (PCIe 3.0) — making them incompatible on the same motherboard. Both support up to DDR4-3200 memory speed. The Core i5-8400 supports up to 128 GB of RAM compared to 64 GB — 66.7% more capacity for professional workloads. Both feature 2-channel memory with ECC support. Both provide 16 PCIe lanes. Chipset compatibility: SoC (Core i5-1145G7) and Intel 300 series (Core i5-8400).

Neither processor supports overclocking. Only the Core i5-1145G7 supports AVX-512 instructions — important for machine learning and scientific applications. Virtualization support: VT-x, VT-d, EPT (Core i5-1145G7) vs VT-x, VT-d (Core i5-8400). Both include integrated graphics — Iris Xe Graphics (80 EU) (Core i5-1145G7) and UHD Graphics 630 (Core i5-8400) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i5-1145G7 targets Business, Core i5-8400 targets Desktop. Direct competitor: Core i5-1145G7 rivals Core i5-1135G7.