Intel Core i5-8400 vs Intel Core i9-9900K

Core i5-8400 vs Core i9-9900K benchmarks

In our benchmarks, the Core i9-9900K beats the Core i5-8400 in overall performance. Furthermore, our gaming benchmark shows that it also outperforms the Core i5-8400 in all gaming tests too.

With info from our database, we find that the Core i9-9900K has slightly more cores with 8 cores whereas the Core i5-8400 has 6 cores. It also has more threads than the Core i5-8400. Our comparison shows that the Core i9-9900K has a slightly higher clock speed compared to the Core i5-8400. Also, the Core i9-9900K has a slightly higher turbo speed. A Core i5-8400 CPU outputs less heat than a Core i9-9900K CPU because of its significantly lower TDP. This measures the amount of heat they output and can be used to estimate power consumption. The info from our database shows that the Core i9-9900K has more L2 cache than the Core i5-8400. The Core i9-9900K also has significantly more L3 cache.

Most CPUs have more threads than cores. This technology, colloquially called hyperthreading, improves performance by splitting a core into multiple virtual ones. This provides more efficient utilisation of a core. For instance, the Core i5-8400 has the same number of threads as cores. This means the the CPU does not support hyperthreading.