Intel Core i7-9700K vs Intel Core i5-8400

The Intel Core i5-8400 (Coffee Lake S, 8th Gen.) was developed for mainstream applications and light gaming.

The Intel Core i7-9700K (Coffee Lake S Refresh, 9th Gen.) targeted enthusiasts with high performance demands and overclocking options.

Both Intel CPUs are manufactured using the 14nm process and support PCIe 3.0. The Intel Core i5-8400 offers 6 cores/6 threads (9 MB L3 cache). The Intel Core i7-9700K features 8 cores/8 threads (12 MB L3 cache) and a max memory bandwidth of 43 GB/s. The Intel Core i7-9700K significantly outperforms the Intel Core i5-8400 in single-core and multi-core performance.

Higher clock frequencies and more cores of the Intel Core i7-9700K provide significantly stronger computing capacity. In gaming, the Intel Core i7-9700K delivers better results thanks to superior single-core performance and higher clock rates. The Intel Core i5-8400 is suitable for gaming but is surpassed in demanding titles.

Both utilize Intel UHD Graphics 630. The Intel Core i5-8400 has a lower nominal TDP (moderate power consumption). The higher nominal TDP of the Intel Core i7-9700K requires more power and more robust cooling due to its performance and overclockability. Originally, the Intel Core i5-8400 was a cost-effective mainstream option.

The Intel Core i7-9700K offered premium performance at a higher price. On the used market, the Intel Core i5-8400 is usually cheaper. The Intel Core i5-8400 is suitable for budget-conscious everyday users and light gaming. The Intel Core i7-9700K is ideal for the highest performance demands in gaming, content creation, and overclocking.