Originally posted by: mariok2006
what is the easiest way to undervolt? i dont have a soldering gun
No need for one.
The free solution is to just grab a little straight pen or a very small screwdriver. You can move some wires around on the molex plug end these have on the end to get 5V or 7V. (5v by using the 5v wire to ground, 5-0=5v, 7v by using the 12v to 5v wire 12-5=7v).
Make DANG sure you do NOT plug anything else into the other end of the molex that comes with the fan though. You dont want to plug a hdd into a wrong voltage molex

Its fine to plug somehting in before the fan though.
Example:
Power supply
|
|
-- Molex connector
== Hdd plugged into molex connector
|
|
-- Molex connector, unmodified
== Start of Molex thats on fan, MODIFIED
|
|
-- Other end of fan molex, DO NOT USE FOR ANYTHING!
If this is too complex or confusing, then do what the other guy said, buy a fan controller. You can often get them for around $5-$15 nowadays.
Originally posted by: SonicIce
Originally posted by: LOUISSSSS
are they rpm sensing?
whats DBB?
double ball bearing.
what is the bearing type on these fans? if its DBB i'm gunna buy a bunch.
If you are worried about bearing noise, these fans when undervolted are some of the quietest 120mm fans (these same type are cherry picked and used as nexus fans, except I believe they add a resistor or diode to lower the RPM even further). Even at full 12v its still pretty decent noise.
I'm the kinda guy that replaced all fans in my case with these (its nice to have a stacker case where almost all fan mounts are 120mm), replaced the noisey motherboard chipset fan with a big heatsink, put in a passivly cooled nvidia 6600GT card and hooked the fans up to fan controllers to reduce noise even further (I love it because I can crank them up when I do gaming and dont care about some extra noise). And I also replaced the fan in my APC UPS because it was too loud. So although I'm not a super quiet freak who can't stand any noise at all (Some of these type of people move thier computer cases into another room or into garage and run long cables so they can have keyboard/mouse/monitor still at their desk), I am still a bit of a quiet freak.
If you are worried about how long they last, at $3 you can replace them a couple/few times for the price you'd normally pay
