DO you have fan hub v1 or v2? If you have v2 which draws power from a SATA power connector then you can have the fan header connected to the CPU_FAN or CPU_OPT and with all your fans hooked up to it should see that the fans are regulated with the temps on your CPU. If you're yet not satisfied with the control on your fans you can go into BIOS and set your fans to manually move at an preassigned RPM. I'm sure you can assign a custom fan curve in BIOS.
Please be warned, it's best you invest in some silent fans by Noctua since silencing your stock fans can cripple the cooling performance in your system. On another note, Corsair's SP120 fans have terrible longevity. They have been known in the community to be worst of it's kind.