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post #9001 of 16136
Quote:
Originally Posted by gdubc View Post

It is bad to control a pwm fan with voltage. It will harm the pwm circuit. If you are running them off a fan controller there is no need to pay extra for pwm.
It really comes down into how you design the cooling of your PC. I really like the freedom that Asus FanXpert2 gives, but the hole AI Suite III its not of my liking, seems unstable and to some point like if the software is still on beta, fanXpert2 should be a stand alone app, but since im having some issues with AI SUite III, im moving toward pure BIOS fan control, and with PWM fans is much easier. And the Asus BIOS fan control is inferior to MSI in my experience with this fans.

For example, im planning on returning to ATX with ARC MIDI2 (still on route), with pure PWM fans, i have chosen Noctua NF-A14PWM out of its good range (250-1600rpm) and no that many options out there. For CPU cooler im going to use a Thermalright Silver Arrow SBE with two TY150 PWM, going to run a Swiftech 8-Way PWM Splitter Box and probably a 2x Y PWM splitter for the TY150. All ran from CPU_Fan1 and CPU_FAN2 headers.

Testing on MSI Z77GA43 on pure bios, i got the following numbers, running the bios fan control with minimum of 25% on CPU Min.Fan Speed control,



I can run it below 25%, the TY150 will rung at 585rpm at 12.5% and at 0%, seems like the fan will never stop on PWM signal, and the sensor still reads it the same. The Noctua NF-A14PWM will also run at 12.5% and 0%, it will never stop either, but MSI motherboard wont read below 400rpm, so the fans are dipping below that. Will see on a MSI Z87 G45 (the board that ill use), but i expect the same readings, but who knows maybe it can read below 400rpm, this would be ideal for me.
Edited by Abula - 8/26/13 at 3:59pm
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post #9002 of 16136
^that will work well in your case, as you will be using a pwm splitter. But with a voltage controlling fan controller he would be better off with 3pin fans. I wanted all pwm fans thinking my board had all pwm headers, so sad to find out I was mislead. I will probably hook everything up like you mentioned if I ever get around to installing my h220, it comes with one of those handy splitters also.
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post #9003 of 16136
Quote:
Originally Posted by gdubc View Post

It is bad to control a pwm fan with voltage. It will harm the pwm circuit. If you are running them off a fan controller there is no need to pay extra for pwm.

It is? That makes my solution even cheaper, don't get the adapter cables and run them 100% through my mobo. I doubt the Noctuas could be annoying or loud at max.

I still want the PWM though as it has better airflow and static pressure than the FLX version.
post #9004 of 16136
You should do like Abula mentioned in that case and use a pwm splitter off your cpu header. No need for a fan controller. Just get one like the swiftech that supplies the power to the fans from a molex to your psu instead of off the mb header. The mb header is just used for the sense and pwm signal wires in that instance.
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post #9005 of 16136
Quote:
Originally Posted by gdubc View Post

You should do like Abula mentioned in that case and use a pwm splitter off your cpu header. No need for a fan controller. Just get one like the swiftech that supplies the power to the fans from a molex to your psu instead of off the mb header. The mb header is just used for the sense and pwm signal wires in that instance.

If I do that would I be able to set custom fan profiles for each fan or would it run the same as my CPU fan?
post #9006 of 16136
The only problem with my plan is the motherboard, for example im chosing MSI out of it not having dumb restriction on the bios, i can send 0% pwm signal if i wish, on other motherboards is different, for example my Asus Maximus IV Gene, also can control the pwm fans on bios, but on manual (like the msi) it has a restricion of 40% on CPU header, not good enoufh for me, the NF-A14PWM runs at 615rpm (but to most it should be fine), it has presets also, the silent mode allows a little lower than the manual lowest, cant say how much as its preset on the bios, but here is on the Noctua NF-A14PWM on the Asus bios control



But remember im really trying to have my fans very low on idle, and let them ramp up with the load, overall for most what im doing is not worth it, its just that to me its something i want to do in terms of creating a very quiet setup that i dont have to push nobs when i game / bench.
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post #9007 of 16136
Quote:
Originally Posted by Moragg View Post

If I do that would I be able to set custom fan profiles for each fan or would it run the same as my CPU fan?
No you cant, this is a tricky part, this is the reason i bought mulitple fans to test before i even chose the motherboard, for me its like matching the fans. All fans will get the same PWM signal so whatever they are rated to run at that signal is what they will run, cant control them indiviually like this, if you wish to do it like that go with Asus motherboard, one with FanXpert2 will allow you control alll your fans, but as gdubc recommended, only use PWM fans on the CPU_FAN or CPU_OPT headers, this are the only true pwm headers, the rest are voltage controlled fan headers, so i also agree that you are better off using a 3pin fans on chassis fan headers, Asus fanxpert2 is pretty solid in terms of testing and giving you full range of operation on all fans, it will even overwirte the BIOS restrictions and give you full control, its really amazing software.
Edited by Abula - 8/26/13 at 4:29pm
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post #9008 of 16136
I may do that... but you can run the fans full tilt off the 3 pin headers without damaging them, correct? So if that noise level is OK with me then I would probably leave it at that.
post #9009 of 16136
They would all run off the CPU profile. Only one reports speed back and they are all controlled the same. Most, if not all motherboards only have the cpu and sometimes cpu_opt headers that are true pwm, regardless of what the motherboard manual says. That is for sure the case with Asus anyhow.

Edit: doh! i was too late!!
Edited by gdubc - 8/26/13 at 4:30pm
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post #9010 of 16136
Quote:
Originally Posted by Moragg View Post

I may do that... but you can run the fans full tilt off the 3 pin headers without damaging them, correct? So if that noise level is OK with me then I would probably leave it at that.
Im not sure about the damaging, i never have ran a PWM fan on 3pin voltage control for long periods of time, just for testing mostly. What i can tell you is that in my personal testing the PWM Fans run smoother on a 4pin PWM header and running them on 3pin voltage controlled headers will not allow them to drop as low as they can on 4pin PWM header (but remember that even if it has "four pins" its not enough to guarantee that its a pwm fan header, usually only CPU_FAN and CPU_OPT on Asus, and on MSI CPU_FAN1 and CPU_FAN2, idk other motherboard). This is the main reason that i was suggesting just to use fanXpert2, just use 4pin fans n the CPU_FAN headers, and use 3pin on CHASSIS_FAN headers, the rest is cake for fanXpert2, it will test the fans, it will establish its highest and lowest settings and it will calibrate it for you, you can always overwrite this and create your own ramping profile. For me FanXpert2 is the best by far managing software for fans there is, the only problem for me is that comes with AISUITE III, if Asus were to release it as stand alone, ill go back to asus motherboards, but for me atm is all about BIOS fan control and thats why im choosing certain fans that should work well together on the bios, and chosing a motherbaord that can drop them low enough for what im planning to do, but what im doing is way more complicated than it has to be, FanXpert2 will do all things for you as long as you chose the correct fans for each header.
Edited by Abula - 8/26/13 at 4:53pm
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