Touch the base of the hs if you can hold your finger on it and it feels comfortabley warm then your ok, temp probly in low 40c if however you have to pull your finger away after 3 to 5 seconds then temp in mid 50c and thats no good at idle
Good idle temps are 37c to 42c and full load temp 55c to no more than 60c that is of course if the sensor is accurate thats why I alway do the finger test when first turning on a new build. A better way is to use a digital thermometer with its sensor placed at the base of the hs to get a handel on what the temps really are.
What mobo are you using?
Rick