7V Fan Mod HELP

[phu302000]

Hey guys I just got a new apevia 120mm fan from newegg, hoping that it would be fairly quiet but pushing more air than my stock apollo case fan. However it is pretty much twice as loud and I well want to do a quick 7v fan mod. I was wondering how to do a volt mod on a molex passthru connnection. Please help, I am running my linux pc because of how loud this new fan is and I dont want to buy a new one or a fan controller. Please have some sort of tutorial with pictures or some descriptive instructions, somewhat a nub with this stuff. Thanks a lot in advance, dont worry my ps supply is good enough for it. Thanks a lot.

Fan link:
http://www.newegg.com/Product/Produc...82E16811998121

[Steve B]

By molex pass through, do you mean...

one of these?

If so, its just a case of swapping around the black and red wires. Use a small flat-head screwdriver to push the barbs of the molex connection points inside the main connection. You should then be able to pull the wires out, and swap them over. Be wary though, that anything you attach on the other side, will also have the connectors swapped over!
The easiest option would just be to construct a passthrough as seen in the bottom of the picture, where you construct a seperate passthrough to change to 7V

[phu302000]

alright I will try it and I will see how it goes, so for the "easier way" do you mean to get another passthru wire then switch the wires then plug it into my passthru fan cable? Also what do you mean by swapping around the red and black wires, Im not sure which ones you are telling me to swap, please be specific, im kinda of a noob. Thanks in advance, ps my fan pretty much ends my series from my ps line of fans and lights.

[phu302000]

Actually I solved it, however I accidentally ripped out the wires coming out of one of the molexes, so I just completely cut two of the wires from the fan then twisted them into a spare molex passthru that I found and I moved the switched the black and red. Well it runs fine but Im wondering if it is ok to electric tape the twisted ends together i covered each twist by itself in lots of electrical tape. So is it safe to do so, or should I just go buy a new fan, such a nub lol. Thanks a lot again.

[Steve B]

in the top molex, the pass through, the yellow and black wires at the top feed the fan. yellow = 12v and black = GND. what you want to do is remove the black pin from the molex, and the red one. Swap them about and put it back together. Thus, when you plug the molex into the PSU, the fan is effectively connected to the yellow pin and the red pin. Yellow = 12v, Red = 5v, so the potential difference across the fan is 7v

[scrandman]

For the ultimate in quiet, switch the red & yellow (and put blacks back to where they were originally). This will give you 5V.

[Pob255]

Black = Ground, Yellow = 12v, Red = 5v

Quick correction
Basically you converting the 5v into a ground and pushing 5 of the 12volts through it leaveing you with 7v. (very basically speaking)
There can be a problem as PSU's don't always like to have power fed back down a live wire.
Converting it to 5v is safer (swap the yellow for the red) 5v is pritty much minimum speed you can run a fan at. (most fans below 5v stop as the motors cannot push them around)

[Steve B]

thanks Pob, never noiced that