Core i5-9400 vs Core i5-1145G7

The Core i5-9400 packs 6 cores / 6 threads, while the Core i5-1145G7 offers 4 cores / 8 threads — the Core i5-9400 has 2 more cores. Boost clocks reach 4.1 GHz on the Core i5-9400 versus 4.4 GHz on the Core i5-1145G7 — a 7.1% clock advantage for the Core i5-1145G7 (base: 2.9 GHz vs 2.6 GHz). The Core i5-9400 uses the Coffee Lake (2017−2019) architecture (14 nm), while the Core i5-1145G7 uses Tiger Lake-UP3 (2020−2021) (10 nm SuperFin). In PassMark, the Core i5-9400 scores 9,372 against the Core i5-1145G7's 9,266 — a 1.1% lead for the Core i5-9400. L3 cache: 9 MB (total) on the Core i5-9400 vs 8 MB (total) on the Core i5-1145G7.

The Core i5-9400 uses the LGA1151 socket (PCIe 3.0), while the Core i5-1145G7 uses FCBGA1449 (PCIe 4.0) — making them incompatible on the same motherboard. Both support up to DDR4-2666 memory speed. The Core i5-9400 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.

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 (Core i5-9400) vs VT-x, VT-d, EPT (Core i5-1145G7). Both include integrated graphics — UHD Graphics 630 (Core i5-9400) and Iris Xe Graphics (80 EU) (Core i5-1145G7) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i5-9400 targets Desktop, Core i5-1145G7 targets Business. Direct competitor: Core i5-1145G7 rivals Core i5-1135G7.