What role does the GPU play in UE4 when compiling?

[WalkingDead]

@;166859

The reason removing the HD 4870 made compiling shaders take longer, is the Intel HD Graphics is built into the CPU. It now had to perform rendering, and compiling shaders on the same chip, that is what slowed it down.

aah I see well explains a lot LOL

I wonder the performance difference between the FX 6300 AMD and the 4130 i3 haswell @ 3.5ghz
in UE4?