Long story short... if I use a splitter to connect a max 1,000 RPM fan and a max 1,700 RPM fan to the same 3-pin motherboard header, will the 1,700 always run faster? I'd like to keep them both under 1,000 if possible.
Fans with different max RPM on same motherboard header
Quatrix
1 - 6 of 6 Posts
Yes, it's like an extension cable, but the 3-pin connector allows for variable voltage and RPMs. As far as I know, adjusting the fan speed changes the voltage. This assumption is oversimplified and inaccurate, but let's say that giving half voltage runs the fan at half its maximum RPM. Then setting the fan speed (via BIOS, software, whatever) at 50% would run the 1,000 RPM fan at 500 and the 1,700 RPM fan at 850 because they're hooked up to the same motherboard header. The 1,700 would always run faster. If I wanted to keep them both at 1,000 or less, I'd have to run at 59% speed (1,000 / 1,700), which would put the 1,000 at 590. That's my understanding, which I'm trying to confirm.
Don't use one of those!!! they could harm your motherboard. Buy a adapter that allows you to plug the fans into your psu like this: http://www.newegg.com/Product/Product.aspx?Item=N82E16812119248
I've read in many places that splitters work just fine as long as you don't put a bunch of fans on one motherboard connector. A 3-pin connector allows monitoring and control of speed. Plugging the fan into a power supply molex connector gives it full voltage and RPM all the time, which would defeat my purpose.
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