That is normal depending what CPU you are running.
Under Prime95 or similar Load
4 Core FX - CPU Core and Socket are usually the same temp
6 Core FX - CPU Socket is ~5-7C higher than the CPU Core
8 Core FX - CPU Socket is ~10-15C higher than the CPU Core.
Because the CPU Socket is directly linked to the VRMs the extra current to run the 6 and 8 core FXs causes temps to be higher.
Edited by ComputerRestore - 7/14/13 at 4:56pm