I have been having some issues recently with getting my CPU to idle at a reasonable temp. I have a i7 920 (not overclocked), and it has been idling at about 47C for a long time. I just switched to a Noctua DH14, but I didn't really see any improvement. Thinking it might be my application of thermal paste, I went back and did a extremely meticulous job of applying the paste (Arctic Silver 5). That got it down to 40C, but that still seems really hot for a stock CPU. I have plenty of airflow in my case and minimal dust. Can I get some suggestions for what might be going on? Thanks.