Intel Core i5-9400 vs Intel Core i3-9100

The Intel Core i5-9400 and Intel Core i3-9100 are 9th generation desktop processors, based on Intel's 14nm "Coffee Lake S Refresh" architecture.

Both support PCIe 3.0 and include Intel UHD Graphics 630. The Intel Core i5-9400 offers six cores, six threads, 9 MB L3 cache, and 43 GB/s memory bandwidth. It was designed for mainstream users with needs for general tasks, light productivity, and gaming. The Intel Core i3-9100 has four cores, four threads, 6 MB L3 cache, and 38 GB/s memory bandwidth.

It positioned itself as a cost-effective option for basic computing and office applications. In single-core performance, they are comparable. The Intel Core i5-9400 significantly outperforms the Intel Core i3-9100 in multi-core applications, making it more powerful for multitasking and demanding software.

For gaming with a dedicated graphics card, the Intel Core i5-9400 offers a more robust base thanks to more cores, while the Intel Core i3-9100 is sufficient for casual games and less CPU-intensive titles. Both CPUs have a TDP of 65 watts. The Intel Core i5-9400 may consume slightly more power under full load but is compatible with standard coolers.

On the used market, the Intel Core i5-9400 offers better value for money for multitasking and gaming; the Intel Core i3-9100 remains a budget-friendly choice for simple office PCs and web usage.