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Please note that this modification involves too much risk and therefore, we would not endorse any change on the hardware. Any hardware changes are at your own risk.
2. The fan is connected to PSU control board, which monitors PSU temperature and controls power level to the fan, therefore controls fan speed based on PSU internal temperature.
3. You should probably not try to route fan to main board because PSU knows temperature but can’t control the fan. The mainboard can control fan speed but does not know PSU temperature.
4. Generally speaking, 3-wire 12V fan would work but you need to be careful about which is power and which is RPM reading. The 3-pin pin order should be:
a. Pin 1, Black is Ground
b. The wire next to black. This one could be confusing, some use red and some use yellow, That is Power (This one should connect to PSU PCB red fan wire).
c. The wire on the other side opposite to black could be yellow or red, is the RPM reading. This one can be open because PSU does not care about speed reading.
So the correct way to do this:
1. Find correct 2-wire replacement fan
or
1. For a 3-wire fan, cut original fan cable, leave cable/connector attached to PSU PCB; cut replacement fan cable; connect black to black, connect the wire next to black to red; and leave 3rd wire open.
2. Make sure all the connectors/open ends are insulated and not in the way of the fan.
Again, all of the above is for information only. Any safety modification is strongly discouraged.
Please note that this modification involves too much risk and therefore, we would not endorse any change on the hardware. Any hardware changes are at your own risk.
2. The fan is connected to PSU control board, which monitors PSU temperature and controls power level to the fan, therefore controls fan speed based on PSU internal temperature.
3. You should probably not try to route fan to main board because PSU knows temperature but can’t control the fan. The mainboard can control fan speed but does not know PSU temperature.
4. Generally speaking, 3-wire 12V fan would work but you need to be careful about which is power and which is RPM reading. The 3-pin pin order should be:
a. Pin 1, Black is Ground
b. The wire next to black. This one could be confusing, some use red and some use yellow, That is Power (This one should connect to PSU PCB red fan wire).
c. The wire on the other side opposite to black could be yellow or red, is the RPM reading. This one can be open because PSU does not care about speed reading.
So the correct way to do this:
1. Find correct 2-wire replacement fan
or
1. For a 3-wire fan, cut original fan cable, leave cable/connector attached to PSU PCB; cut replacement fan cable; connect black to black, connect the wire next to black to red; and leave 3rd wire open.
2. Make sure all the connectors/open ends are insulated and not in the way of the fan.
Again, all of the above is for information only. Any safety modification is strongly discouraged.
Thanks for the detailed info. I decided I'm just going to replace the power supply with a modular SFX one from Corsair (SF450). Less work/risk and then I'll have a nice new PSU.
