Originally Posted by cyberlocc
Originally Posted by IT Diva
My explanation about how the CPU/CPU-Opt headers work was regarding the PWM signal line only.
I didn't expect any loading on the 12V pin at all. . . . Powering the fans directly from the PSU is what the Swiftech splitters are for, . . . well that, and connecting all the PWM lines together.
My point was that a lot of connections on a PWM channel can overload the PWM control circuitry so that it doesn't control properly, and the first signs of overloading are that it won't slow down as much as it did with just 1 fan.
The Swiftech splitters are properly designed so that only the #1 FAN header sends the tach signal back thru the 4 pin PWM/tach connector.
Many other splitter PCB's, MODDIY's for example, stupidly connect all the tech pins together, and have to be modified, cutting a trace on the PCB, so that only the first one carries the tach signal so that they give the correct rpm readings.
So in your opinion Could 12 fans be controlled off of 2 said splitters without issue? so the top rad and bottom rad? Is the 1 line in vs 12 enough to combat the overload to a degree or is the out signal all that you were taking into account already?
@ngzb Well then my apologizes I took it the wrong way. I know a little bit about the subject but im surely no expert and defiantly could learn more as IT Diva has shown me and Im always glad to learn new things
When you put 12 fans on the 2 splitters, and connect the primary splitter to a CPU fan header, the header still sees it as 12 PWM loads . . . . The splitter is not an active component that "boosts" the PWM signal. . . . it just connects all the PWM pins together.That said . . . as long as it's not the Corsair fans, 12 fans daisy chained on 2 Swiftech splitters should not be a problem for most higher end motherboards.
I'm particularly familiar with the issue with the Corsair fans because it's become a big problem for Aquaero 6 owners who bought the AQ6 because it has 4 PWM capable channels expecting it to work with Corsair fans.
The issue is that Corsair does not follow the Intel PWM standard with their fans, since they designed them primarily to work with their own Corsair Link system. . .
They do market them however, as PWM, and that implies that they should behave like all the other PWM fans out there . .
But they Do Not.
That said about the Corsair fans and the usual means of PWM control . . . .
You may want to check the Corsair forums, and see how many can be controlled from the Corsair Link system, if you think that may work better for you than a bay controller. . . .
Large builds with a lot of fans/rads really cry out for, and benefit from, more sophisticated fan control than you can get from just the mobo.
The Corsair fans are black, have a max rpm of ~2400, and depending on the controller, can slow down to ~800 easily.
They move good air, have a decent static pressure, are rather noisy at high speeds, but become very acceptable as you slow them down a bit.
Accept for their control problems, at least outside of Corsair Link, they'd probably be exactly what you're looking for . . . . and the 2-packs are ~$28, so not too expensive either.