Windows 7 Pro
Nvidia GeForce 760 - driver 358.57
Broken in Blender 2.75a, 2.76, 2.76b
Created scene with simple, smooth shaded mesh sphere and rendered same using Cycles.
Render artifacts are visible on sphere in the Cycles render. (See attached files)
When the same scene is rendered using Blender internal the sphere renders smoothly without artifacts.