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Which fan connector?



 
 
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  #1  
Old August 28th 18, 11:30 PM posted to alt.comp.hardware.homebuilt,alt.comp.hardware.pc-homebuilt
Percival P. Cassidy
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Posts: 183
Default Which fan connector?

I have an Asus Prime Z370-A motherboard that has several different fan
connectors, but only two for "Chassis fans."

I have the top and rear fans connected to CHA_1 and CHA_2, respectively,
but I am wondering whether to connect my two (non-PWM) front mounted
drive-bay fans to one of the other on-board fan-connectors or whether to
just power them from a Molex connector.

The currently unused on-board connectors are CPU_OPT (intended for
dual-fan coolers, I think), AIO_Pump (which does not seem to have any
kind of speed sensing control, and M.2.

Suggestions?

Perce
  #2  
Old August 29th 18, 12:48 AM posted to alt.comp.hardware.homebuilt,alt.comp.hardware.pc-homebuilt
Paul[_26_]
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Posts: 766
Default Which fan connector?

Percival P. Cassidy wrote:
I have an Asus Prime Z370-A motherboard that has several different fan
connectors, but only two for "Chassis fans."

I have the top and rear fans connected to CHA_1 and CHA_2, respectively,
but I am wondering whether to connect my two (non-PWM) front mounted
drive-bay fans to one of the other on-board fan-connectors or whether to
just power them from a Molex connector.

The currently unused on-board connectors are CPU_OPT (intended for
dual-fan coolers, I think), AIO_Pump (which does not seem to have any
kind of speed sensing control, and M.2.

Suggestions?

Perce


The fan headers look equally functional. There's six 4-pin
connectors with PWM and RPM. The 5 pin has signals for PWM
and RPM for two more fans (but no +12V), intended for external
fans of some sort.

https://dlcdnets.asus.com/pub/ASUS/m...0-A_UM_WEB.pdf

If you went by the electrical information they provided, it
looks like a total of 8 channels worth. They can do this, because
they're getting these channels "for free" from somewhere. Maybe some
on PCH, some on SuperI/O or something. In the old days, they
didn't like to make "controlled" headers, because it cost
a pass_transistor for each one. These headers today only
contain logic signals (plus raw power). Only the gold header
pins cost money in a sense.

None of those headers should be modulating +12V. The +12V
should be straight thru. The PWM signal enters the fan
hub, and sets the speed at that point. Rather than the
motherboard having any voltage related circuits on board.

If it's more convenient, you can run the drive bay fans
off a molex. Not every fan has RPM output, so some fans
can't be monitored in any case.

Looking at the BIOS screen, might hint that
what's in the manual is "fake" or not. You might
take your queue from what you see in there. Or
if Speedfan doesn't list everything, then some
of the headers might be four pin... but with
no electrical connection to RPM or PWM. That might
happen if the hardware didn't happen to have that
many signals just "lying around".

Paul
  #3  
Old August 29th 18, 04:32 PM posted to alt.comp.hardware.homebuilt,alt.comp.hardware.pc-homebuilt
Peter Johnson[_4_]
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Posts: 5
Default Which fan connector?

On Tue, 28 Aug 2018 18:30:45 -0400, "Percival P. Cassidy"
wrote:

I have an Asus Prime Z370-A motherboard that has several different fan
connectors, but only two for "Chassis fans."

I have the top and rear fans connected to CHA_1 and CHA_2, respectively,
but I am wondering whether to connect my two (non-PWM) front mounted
drive-bay fans to one of the other on-board fan-connectors or whether to
just power them from a Molex connector.

The currently unused on-board connectors are CPU_OPT (intended for
dual-fan coolers, I think), AIO_Pump (which does not seem to have any
kind of speed sensing control, and M.2.


I have the Z370-Pro version of this board and have a fan connected to
the AIO_Pump connector without any issues.
  #4  
Old September 1st 18, 02:14 AM posted to alt.comp.hardware.homebuilt,alt.comp.hardware.pc-homebuilt
Percival P. Cassidy
external usenet poster
 
Posts: 183
Default Which fan connector?

On 8/29/18 11:32 AM, Peter Johnson wrote:

I have an Asus Prime Z370-A motherboard that has several different fan
connectors, but only two for "Chassis fans."

I have the top and rear fans connected to CHA_1 and CHA_2, respectively,
but I am wondering whether to connect my two (non-PWM) front mounted
drive-bay fans to one of the other on-board fan-connectors or whether to
just power them from a Molex connector.

The currently unused on-board connectors are CPU_OPT (intended for
dual-fan coolers, I think), AIO_Pump (which does not seem to have any
kind of speed sensing control, and M.2.


I have the Z370-Pro version of this board and have a fan connected to
the AIO_Pump connector without any issues.


I was so pleased with the quietness of my 140mm top and 120mm rear
Noctua fans and was getting annoyed by the whine of the Antec fans
pushing air through the drive bays that I replaced those by 120mm Noctua
fans as well. Since these are PWM fans, I have connected them to the M.2
fan connector (I do have an M.2 drive, but it is running plenty cool
enough -- 29C -- not to need a fan blowing directly on its heat sink --
and it catches some of the airflow from at least one of the drive-bay
fans anyway). And I discovered that I can specify which components'
temperatures influence the M.2 Fan's speed, whereas the AIO_Pump's speed
is controlled (contrary to what I posted originally) only by the CPU
temperature.

Perce
 




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