Put shortly: Using DC voltage mode, will a motherboard be able to control the speed of a SYS_FAN through a 3-pin connection that is missing the yellow wire (basically making it a 2-pin connection)? If so, if two of these 2-pin fans were connected to one header, will the MOBO know to supply enough voltage for the two fans?
---------------------------
Put longly:
I'm pretty sure that...
--a MOBO can control a 4 pin fan by supplying a constant 12 Volts and using the 4th wire to control speed.
--some MOBOs can control a 3 pin fan by being set to "DC mode" and supplying the fan with a varying amount of Voltage. The yellow wire supplies the fan's RPM data, allowing the MOBO to know the speed of the fan.
Now, using DC mode, could a MOBO control a SYS_FAN that is missing that yellow wire and thus missing the RPM data? I have a few chassis fans that use a molex connection. I can get an adapter that converts the molex into a 3 pin connection without the yellow wire (basically a 2 pin connection), and then plug that into a MOBO header.
As for connecting multiple of these fans to one MOBO header, I have two options.
--attach a Y-splitter to one MOBO header, then attach an adapter to the two ends of the Y, then attach one molex fan to each adapter. (header > Y-splitter > two adapters > one molex fan on each adapter)
--or, I could simply attach an adapter to one MOBO header, then attach one molex fan to that adapter. THEN, I daisychain another molex fan to the first molex fan. (header > adapter > one molex fan > another molex fan daisychained to the first)
With either of these two options, will the MOBO (in DC mode) know to how much Voltage to supply since there is more than one fan connected to a single header (would the MOBO even know there is more than one fan on a single header?) I'd prefer the second method since it allows me to buy fewer adapters and I wouldn't need a Y-splitter.
---------------------------
The reason I ask is because instead of plugging the molex fans into the PSU or getting a manual fan speed control thing, I would like the MOBO to automatically control the fans.
Example of the adapter I would use: https://www.amazon.de/Caseking-GmbH-4043718029068-4-Pin-L%C3%BCfteradapterkabel/dp/B005H0FSCI/ref=sr_1_4?tag=georiot-de-new-21&ie=UTF8&qid=1483723721&sr=8-4&keywords=3+pin+auf+4+pin+molex&ascsubtag=tomshardware-3352933774575687473-21
Thanks for any help.
---------------------------
Put longly:
I'm pretty sure that...
--a MOBO can control a 4 pin fan by supplying a constant 12 Volts and using the 4th wire to control speed.
--some MOBOs can control a 3 pin fan by being set to "DC mode" and supplying the fan with a varying amount of Voltage. The yellow wire supplies the fan's RPM data, allowing the MOBO to know the speed of the fan.
Now, using DC mode, could a MOBO control a SYS_FAN that is missing that yellow wire and thus missing the RPM data? I have a few chassis fans that use a molex connection. I can get an adapter that converts the molex into a 3 pin connection without the yellow wire (basically a 2 pin connection), and then plug that into a MOBO header.
As for connecting multiple of these fans to one MOBO header, I have two options.
--attach a Y-splitter to one MOBO header, then attach an adapter to the two ends of the Y, then attach one molex fan to each adapter. (header > Y-splitter > two adapters > one molex fan on each adapter)
--or, I could simply attach an adapter to one MOBO header, then attach one molex fan to that adapter. THEN, I daisychain another molex fan to the first molex fan. (header > adapter > one molex fan > another molex fan daisychained to the first)
With either of these two options, will the MOBO (in DC mode) know to how much Voltage to supply since there is more than one fan connected to a single header (would the MOBO even know there is more than one fan on a single header?) I'd prefer the second method since it allows me to buy fewer adapters and I wouldn't need a Y-splitter.
---------------------------
The reason I ask is because instead of plugging the molex fans into the PSU or getting a manual fan speed control thing, I would like the MOBO to automatically control the fans.
Example of the adapter I would use: https://www.amazon.de/Caseking-GmbH-4043718029068-4-Pin-L%C3%BCfteradapterkabel/dp/B005H0FSCI/ref=sr_1_4?tag=georiot-de-new-21&ie=UTF8&qid=1483723721&sr=8-4&keywords=3+pin+auf+4+pin+molex&ascsubtag=tomshardware-3352933774575687473-21
Thanks for any help.