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#1
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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
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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
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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
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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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