H110 stock fans speeds is different

Hi to all...Today i saw that one of my stock fans of my H110 runs at higher rpm that the other...I understand this because when i have my hand close to the fan with the lower rpm,i feel the air pushing inside the radiator is lower than the other fan..Also in bios i saw 2 reading about my cpu fans rpm..Cpu fan i think 1300-1500 rpm and alternative cpu fan is around 800 rpm...My H110 is on top and the fans is under the dust filter as intake to pull fresh air inside the case through the radiator like Corsair said on instuctions...So how can i make the 2 fans of my H110 runs to the same speed?



4770K/H110/Asus v1 Hero/R9 290 Tri-X/750D Corsair with the 3 stock 140mm fans+1 120mm on bottom plug directly to my psu Corsair RM850