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Fans with different max RPM on same motherboard header

post #1 of 6
Thread Starter 
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.
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post #2 of 6
They will run at the speed they are made to run at, the splitter is just like an extension cord that you can plug multiple cords into
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Problem Child
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TROUBLEMAKER
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Alienbuild1
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i7 3930k Asus Rampage IV Extreme 7970 G.Skill 16g 1600 
Hard DriveHard DriveOptical DriveCooling
Mushkin 120 SSD WD 1TB Asus 24x XSPC Raystorm 
CoolingOSMonitorPower
EK mobo waterblocks W7 Ultimate HP LA2205wg x 3 Antec 1000 TPQ 
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NZXT Switch 810 
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i5 760 4.0@1.26v MSI P55-GD80 GTX 460 G.Skill 4x2gb ddr3 1600 
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WD 840gb Asus 24x H100i W7 Ultimate 
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HP LA2205wg  HP  1000 w Antec Lanboy Air 
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Microsoft Arc 
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Phenom II 955 C3 ma790x-ud4p Radeon HD 5770 OC OCZ 800 4x2gb 
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post #3 of 6
Thread Starter 
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.
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post #4 of 6
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
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post #5 of 6
Thread Starter 
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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post #6 of 6
Quote:
Originally Posted by Quatrix;13031018 
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.

Yes, the faster fan will always be faster. If you want different speeds for each fan, you'll need separate 12v for each, or modify (resistor or 5/7v mod) the faster fan to run slower.
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