GPU and CPU @ same time?

Hello everyone,

I’m not sure why this is happening, but when I’m rendering using CUDA and my device on the render tab is set to GPU Compute, 3 to 4 of the cores on my 8 core processor are still being used at 100%, I found this out by opening Windows 7 Task Manager and went to the Perfomance tab and then open the Resource Monitor, Im using Blender 2.78a., I hope this is some setting that I’m overlooking. Any help would be appriciated.

Bob Koonce

this is normal, and good.