3DMark is a program with a set of several 3D benchmarks. Fire Strike runs a “heavy” DirectX 11 simulation. Sky Diver also measures DirectX 11 performance, and is aimed on average computers. The Cloud Gate benchmark measures DirectX 10 performance, and the Ice Storm Extreme measures DirectX 9 performance and is targeted to entry-level computers, so we don’t ran it.
On Fire Strike, the Core i7-7700K performed similarly to the Core i5-7600K, and was 17% faster than the Core i3-7100.
On the Sky Diver benchmark, the Core i7-7700K was not faster than the Core i5-7600K, but was 19% faster than the Core i3-7100.
On the Cloud Gate benchmark, the Core i7-7700K was 15% faster than the Core i5-7600K, and 41% faster than the Core i3-7100.