Need a bit of help, will this work?

euphoria4949 · Apr 8, 2013

Hi everybody, could someone please help me with this because I need to order these by tomorrow morning.

I need to get a few adapters for some new fans I've ordered: 4-pin Molex>>to>>standard fan 3-pin, so I can connect them to my fan controller to monitor and increase/decrease the rpm as and when I need to.

I found these *Here*, but they only have 2 wires (1-Black & 1-Yellow) going from the 4-pin Molex to the 3-pin plug, so does that mean I won't be able to control the rpm with my fan controller??? I think the Yellow wire is 12v, but what is the black wire for and the missing red wire??? :??:

Really need a little help please,
Thank you

spigias · Apr 8, 2013

hi,
i believe it wont be a problem most fan controllers reduce or increase voltage to change the fan speed(thus only two wires required for this).

ps the third wire is to report the current speed(rpm to your bios or to your fan controller screen)).

euphoria4949 · Apr 8, 2013

spigias :

Thanks so much for your quick reply.

Can I just check something with you though. The fans I have ordered are Scythe GT's the 5400 rpm version and the wiring is like so:

From what I've read while Googling, wouldn't the adapter need to have a Red & Black wire from the 4pin Molex to the 3pin plug like this:

Instead of the Yellow and Black on this adapter???

I'm not bothered too much about monitoring the rpm I just need to be able to connect it directly to my fan controller and adjust the voltage to speed up or slow down the fans.

Thanks again

spigias · Apr 8, 2013

euphoria4949 :

ok explanation red(fat) wire is 8V,yellow(fat) wire is 12V, the two black(fat) is ground.
i believe all the normal fans use the yellow(fat) and one black(fat)(doenst matter witch one).
if you change the yellow(fat) to red wire(fat) your fan will work really really slow due to the lack of voltage.

the thin yellow wire(the lonly one) is reporting the rpm to your mobo.

spigias · Apr 8, 2013

this must be wrong
using this adapter, you can power a 3-pin fan from a 4-pin molex connector.
this is the correct
using this adapter, you can power a 4-pin fan from a 3-pin molex connector.

the 3 pin must be male not female(because your fan 3 pin jack is female). i believe the second pic is the correct , look the 2 pin jack is male.

euphoria4949 · Apr 8, 2013

spigias :

Thank you for explaining the difference between the wires. I had Googled it but from what I read the different colours mean different things depending on whether its a 4-pin or a 3-pin, unless I just confused myself which is entirely possible lol.

So this one would work:

Fan (4-pin Molex Male) >>> Adapter (4-pin Molex Female) >>> Adapter (3-pin Female 1-Yellow 12v & 1-Black Ground) >>> Fan Controller)
Is that correct???

Sorry if I'm confusing things lol.

spigias · Apr 8, 2013

assuming your scythe has a 3 pin female connector, no it wont work you need an adapter with 3pin male connector i think the correct adapter is the second image you posted the one with 2 thin red and black cable.

the adapter you are mentioning above has 3pin female your scythe also has 3pin female, so you cant connect this two.

euphoria4949 · Apr 8, 2013

spigias :

Oh, no the fans in question only have 4-pin Molex, which is why I needed the adapters so I could plug the fans 4-pin Male into the adapters 4-pin Female then the adapter 3-pin plug into my fan controller.

spigias · Apr 8, 2013

euphoria4949 :

oh i am sorry men i thought that your scythe come's with 3pin molex, then you are good to go

euphoria4949 · Apr 8, 2013

Brilliant thank you so much for all your help. And you wasn't wrong really, the Scythe GT "Silent" fans up to 1850rpm are 3-pin but the high performance versions from 2000-5400rpm are 4-pin Molex.

Thanks again =)

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