looks like ur temp is little bit high if its the idle temp. but dont worry, 43c wont damage the cpu or anything. i have zalman 9500 and my cpu is at 2.8ghz (using x2 4800+) and my temp is 28-32c idle and 39-43c at max load in game or any torture test. ya mb the airflow issue or too much or too less thermal paste? AS5, u only need tiny drop on the center of the cpu.