Intel Core i5-2500k vs Intel Core i5-6400

The Intel Core i5-2500k, introduced in 2011, is based on the Sandy Bridge S architecture and was manufactured using a 32 nm process.

It targeted the mainstream market with overclocking potential for enthusiasts. It features 4 cores and 4 threads, Intel HD Graphics 3000, and PCIe 2.0. Its maximum memory bandwidth is 21 GB/s. The Intel Core i5-6400, introduced in 2015, uses the Skylake S architecture and was produced with a more efficient 14 nm process.

As a mainstream processor, it also offers 4 cores and 4 threads, but with Intel HD Graphics 530 and PCIe 3.0. Its maximum memory bandwidth reaches 34 GB/s. Both CPUs have 6 MB of Level 3 Cache. Regarding performance, the Intel Core i5-6400 delivers significantly higher single-core performance and also considerably surpasses the Intel Core i5-2500k in multi-core tasks.

This is attributable to the newer architecture and improved instructions per cycle. For gaming scenarios, the Intel Core i5-6400 offers noticeably better performance due to these performance increases, higher memory bandwidth, and PCIe 3.0. In terms of power consumption, the Intel Core i5-6400 with 65W TDP is significantly more efficient than the Intel Core i5-2500k with 95W TDP.

The Intel Core i5-2500k offered excellent value for money at the time, especially through overclocking. The Intel Core i5-6400 scores with more modern efficiency and platform. The Intel Core i5-2500k stands out for its overclockability. The Intel Core i5-6400 offers higher performance, better efficiency, and more modern features.

For a more modern, powerful, and efficient system basis, the Intel Core i5-6400 is clearly the better choice.