Fan rpm not working

hey just got a corsair sp 120 high performance edition 4 pin fan rpms not working properly its connect to the motherboard  not sure what to do any info will help

Is it connected to a 4pin header?

yes and i have tried a different header and my motherboard is a asus  m5a97 le r2.0 if that helps

and you cant control that fan in the Asus fan xpert utility?

 

yes sort of its like a three pin fan at the moment but the apm goes A/N or 100 to 200000

so made the the motherboard ignore the rpm it so it not at max speed