Intel Core i5-6400 vs Intel Core i3-7100

The Intel Core i5-6400 (Skylake S, Q3 2015) is a mainstream desktop processor with 4 cores and 4 threads, and 6 MB of Level 3 Cache.

The Intel Core i3-7100 (Kaby Lake S, Q1 2017) is a more affordable desktop processor with 2 cores and 4 threads (Hyper-Threading), and 3 MB of Level 3 Cache.

Both are manufactured using a 14 nm process and support PCIe 3.0. In multi-core applications, the Intel Core i5-6400 delivers significantly superior performance due to its higher core count. For single-core tasks, the Intel Core i3-7100 shows marginally better performance due to a higher clock frequency, while the Intel Core i5-6400 is also strong in certain single-core tests.

For gaming, the Intel Core i5-6400 is more advantageous due to its four physical cores, especially in modern games. The Intel Core i3-7100 could keep up in less demanding games. Both integrated graphics units (Intel HD Graphics 530 for i5, Intel HD Graphics 630 for i3) are suitable for basic tasks.

The maximum memory bandwidth is 34 GB/s and 38 GB/s, respectively. Both CPUs have a moderate Thermal Design Power, typical for their generation, and are designed for standard cooling solutions. On the used market, the Intel Core i5-6400 with its four cores offers a better price-performance ratio for multitasking and gaming.

The Intel Core i3-7100 is often cheaper and a solid option for basic office tasks. The Intel Core i5-6400 is recommended for improved multitasking and gaming performance. For budget-conscious users with simple tasks, the Intel Core i3-7100 is a suitable choice.