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PWM Fan control

post #1 of 6
Thread Starter 
Hope someone can help me with this. Is there a limit to how many fans I can control with one PWM signal? I have 12-14 fans (all on rads) I want to control with one 4 pin MB connector. From all the fans I will wire the + and - 12v straight to a molex or sata from the power supply. The speed signal from one fan to the MB and all the PWM signal wires to the MB. I know this must work with at least 5 fans as there are connectors sold that do this, also an 8 connector block available from Swiftech. Question is how many is the limit? Tia
post #2 of 6
If you are powering your fans through a molex or sata connector and using PWM only for controlling fan speed, there isn't a real limit to how many fans you can have off one connector. You will only get 1 speed reading in the bios, however. You might also have problems with harmonics if all fans are going at very similar speeds.
post #3 of 6
Thread Starter 
Thanks. I thought that would be the case. Thanks for the reminder about harmonics. Been in plenty of server rooms where the fans are almost deafening. Don't have much choice as to running them the same speed. At least on each rad. 8 fans on a monsta 560 and 4 fans on a monsta 280. Hoping the better static fans at lower rpm will keep noise in check.
post #4 of 6
Quote:
Originally Posted by RDKing2 View Post

Thanks. I thought that would be the case. Thanks for the reminder about harmonics. Been in plenty of server rooms where the fans are almost deafening. Don't have much choice as to running them the same speed. At least on each rad. 8 fans on a monsta 560 and 4 fans on a monsta 280. Hoping the better static fans at lower rpm will keep noise in check.

Would love to see picts of that setup, and temps.
post #5 of 6
Thread Starter 
Should have all the fans next week. Am trying the Akasa vipers, saw a test in which they did well. A plus is that the yellow color goes with my build. Have to pick up my custom pedestal from the sheet metal fabricator and finish it, will house the 560. Will see how my AquastreamXT does with adding the new 560 rad on top of everything else. May be a couple of weeks.
post #6 of 6
Thread Starter 
Got all my fans and the new rad



With all 8 of those going at full blast (1600 rpm) it is a bit noisy for everyday operation. Installed 4 of the fans on the 280 and 2 in the case. A bit noisy as well. Turning them down to 1200 or so will be fine. These fans move a lot of air!

Should have the riser in a few days.
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