Fan Speed Control help Needed !!

[ChessMaster]

I am having Sabertooth 990FX mobo, Corsair H70 and SilverStone Raven 2 Chassis , my problem is all Fans in my Rig are having 3pin connectors, while on motherboard there are 4pin(PWM).

Due to this I am not able to control my fan speeds via OS (since FANs are not PWM), please suggest a way to set setting in bios for fan speed controlling by altering the voltage supplied by mobo to fan controllers, or some software that can do this. I also thought of buying a FAN controller like NZXT Sentry 2 but I will rather like to do it by using O.S, please tell me if this is possible if FANs aren't PWM (to supply different voltages to fan).

Thankyou.

 

[vivek.krishnan]

Without 4pin fans, it cannot be controlled by the mobo and so by extension, the OS. Best is to get a cheap fan controller.

 

[ChessMaster]

Without 4pin fans, it cannot be controlled by the mobo and so by extension, the OS. Best is to get a cheap fan controller.

@ vivek thx for the quick reply, i found two extension wires with my H70 after attaching which the fan Rpm dropped to 1500, its good as I didn't like it at 1900rpm (lot of noise).

Also I am able to control the Chassis Fan speed, only CPU fan Speed is constant, another issue is with Chassis Fan when ever I start AID64 2.0 after some time the Chassis Fan speed is dropping down to 300-400rpm (Q-Fan Disabled).

But when I exit AID64 and Enable and Disable Q-Fan the Fans run at 1000rpm(max RPM).