The 8400 is one of Intel’s i5 series of processors and is manufactured with the Coffee Lake microarchitecture. The 8400 has six cores and six threads, 50% more cores and 50% more threads than the former flagship of the i5 series – the 7600K. The 8400 outperforms the 7600K in several areas and does so while consuming 26 fewer watts of power while operating at its base frequency of 2.8GHz. The processor’s integrated GPU is Intel’s UHD Graphics 630 which is suitable for low-end gaming.
Since modern games benefit from multiple cores, a strategy worth considering is to make the 8400 your first hex-core CPU and then in 2-3 years upgrade to a faster Coffee Lake processor. The i5-8400 is available at a good price from Amazon.com. The six cores and six threads, low power requirements and integrated graphics combined with a competitive price make the 8400 an attractive product.