With the Intel® Core™ i7-2600K and a Cooler Master Hyper 212+ I was hitting high 20s to low 30s on idle but there was one core that was 6c cooler than the others. So I don't know why it is showing that big of difference but I would run a Prime95 or Intel Burn Test and see if you see any issues under load just to make sure.
Intel Enthusiast Team
thanks for replying. Using intel burn test in high
core #0 31ºC 48ºc
core #1 31ºC 53ºC
core #2 31ºC 53ºC
core #3 31ºC 51ºC
Cpu 20ºC 42ºC
Cpu temp maintains the difference idle/load.