The CPU fan would need a 3 pin connector and should be attached to a very specific plug on the MB. There may also be BIOS setting to govern thresholds at which speed changes. Have you already verified the connection to be correct and checked BIOS for such settings?
Hi again, I just recieved my new mobo in today. Installed it and every thing is working great except my CPU fan is running at 4400 rpms. The temp of the pcu it around 100-110 F. Any ideas on how to slow this fan down. Tried speed fan but it didnt work.