865PE Neo2 north branch fan always running full speed

Core Center does not seem to work.  I have the latest version and it is quiet for first 5 minutes, then it gets louder and louder.  I have replaced the NB fan once and that seemed to help for a while, but now it is always running at full speed.  The fan goes to full speed even when no one is using the computer for 1/2 hour.
1)  How to troubleshoot?
2)  Are there other fan speed control programs that actually let you control the speed of the fans?

Try SpeedFan.  If your mobo's sensor chip is supported by Speedfan, you can adjust the fanspeed with it.
Another option would be to replace the NB fansink with a Zalman fanless northbridge heatsink like the NB47J...  I got a 865PE Neo2-V board and it came with a passive heatsink, so a passive heatsink might work OK for yours as long as you got good case airflow.
Good luck.

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