Intel Core i7-6700K vs Intel Core i5-9400F

The Intel Core i7-6700K is the faster chip for gaming by roughly 2%. Here is the full spec-by-spec breakdown.

Intel Core i7-6700K wins — about 2% faster for gaming
Specification Intel Core i7-6700K Intel Core i5-9400F
Gaming score 53/100 52/100
Tier C C
Manufacturer Intel Intel
Cores 4 6
Threads 8 6
Base clock 4 GHz 2.9 GHz
Boost clock 4.2 GHz 4.1 GHz
Power draw (TDP) 91 W 65 W
Release year 2015 2019

Which should you buy?

For gaming specifically, the Intel Core i7-6700K is the better buy — it holds a 2% lead in our index, which shows up most at 1080p and in CPU-bound titles like strategy and simulation games. The Intel Core i5-9400F has more cores (6 vs 4), which helps if you stream, compile or render alongside playing. The Intel Core i5-9400F runs 26W cooler, meaning a cheaper cooler and less case heat. Either way, pair it with a graphics card of similar standing — check the bottleneck calculator before you buy.