am i supposed to be using both connectors on the nexus?
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am i supposed to be using both connectors on the nexus?
or is using the 3 pin one enough?
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- Posts: 606
- Joined: Wed Oct 13, 2004 4:03 pm
- Location: Albany, GA USA
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- Posts: 606
- Joined: Wed Oct 13, 2004 4:03 pm
- Location: Albany, GA USA
My 12cm nexus was missing the power connector on the 3 pin connoctor. Some have a 3 pin power connector, some have an rpm monitoring only 3 pin connector.Michael Sandstrom wrote:I think on the Nexus both connectors are for power and only one should be used.
And even if it does have a power connector, you could cut it if you want to power it of the molex and have rpm monitoring.
I don't think it's quite that simple, as there appears to be more than one version of the Nexus fan around and Nexus's product info page isn't very helpful.m0002a wrote: You should not use both the 3-pin and the Molex connectors. I am surprised your PSU has not blown up yet.
There's another thread here asking the same question...
Actually, it really shouldn't matter whether you use one or both unless your motherboard (where I assume your three pin fan headers are) has a fan speed controller. If it doesn't then plugging the fan into both just means it is connected to the 12V line of your PSU through two different wires and to the ground through two wires but the circuit is still basically the same. However, if your motherboard has a fan speed controller, and especially if you turn it on, then it will reduce the voltage through the three pin header and you will get current flowing backwards into your motherboard from the 12V line to the fan controller on your mobo. This is exactly the same problem that the 7 volting trick has except that your PSU almost certainly has some amount of draw on the 5V line such that nothing will burn out while a mobo fan controller is quite likely to fry if current runs backwards through it. So, it isn't a hard and fast rule as to whether or not it will be a problem to plug in both connectors (if the three pin connector has the red and black power wires) but it is always better to be safe than sorry.
Some bioses have trouble interpreting the rpm signal from low spinning fans. There are some monitoring softwares around that do a better job.andyd wrote:the bios keeps showing that the rpm drops to 0 and speeds up again but i dont see anything wrong with the way the nexus is spinning. i had to turn off the rpm warning in order to get things going. is this normal behavior?