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Thread Starter 
This motherboard has 3 different types of fan connectors,

My problem is when I connect a case fan rated at 2500rpms I get:
CPU_FAN rpms = 2400
CHA_FAN rpms = 2000
OPT_Fan rpms = 600

They are all 4 pin connectors on the motherboard and the fans are 3 pin.
I have tried a couple different fans rated at the same rpms.
I have also tried every setting in the bios but nothing will change the rpms.

Are these different connectors made for different types of fans?
I would like to be able to use all of the connectors to run at full rpms.

Thank you for all your help.