The motherboard (MSI H81M-E35 V2) has a 3-pin header and a 4-pin header. With the former, there's no option for fan control, and with the latter, while I see options, they don't affect the speed at all. I'm using MSI's Command Centre and the different options are 50%, 75% and 100% speed. I don't think this mobo lets you control voltage fans, so I do I have to use some sort of voltage divider?
Im sorry im not home to help more, but on both my MSI motherboards, do have similar bios fan control (i dont use nor like the control center). The CPU_FAN header is only able to control 4pin PWM fan headers, from 12.5% to 100%, with 12.5% increments, this is on both my MSI Z87-GD65 and MSI H81i, on the 3pin i know that on my GD65 i can control the SYS_FAN headers with a minimum of 50% with 10% increments (this is voltage control), i dont remember on my MSI H81i as i used only PWM fans connected to a PWM fan splitter and then only connected to the CPU_FAN, ill try to enter the bios on the weekend (probably Sunday) to post a couple of images of what i mean on the bios.