Case fans help for a newbie

[yiranhu]

Hi all,

I'm doing my first complete build next week. I'm getting a DS3 mobo and a CoolerMaster 430 W power supply. I got some 120mm and 80 mm case fans for my Ultra Wizard case. First of all, the case has a front side 80 mm fan mount and a rear 120 mm. What's the correct orientation for the fan installation? I figured one of them is sucking air in and the other is blowing it out. Is that right? If so, what is the best direction for this? Front to back or back to front?

Secondly, the 80 mm fans I have has 3 pin power connectors (Kingwin f01b3pin) but neither the MOBO or the PS have 3 pin connectors. Since this is just a motor, can I just connect the 12 V + and ground from the 3 pin connector to the corresponding spots on a spare peripheral connector on the PS? Will the fan function correctly without the feedback pin?

Thanks all for the help!

p.s: new system spec - C2D 6300 + DS3 + 2GB GSkills (DDR2 800) + CM 430 W + X1600 Pro (GeCube??#$#) + WDC 250 SII! (plan to do some OC)

 

[pkme2]

It would be better if you just got 80mm case fans with 4pin connectors.
http://search.netscape.com/ns/boomframe...A%2F%2Fwww.directron.com%2Fsafb82.html

My YL came with 3pin and 4pin connectors.

 

[yiranhu]

Well I wish that were the case too. Unfortunately, that's not the case. I have some 4 pin connectors so I think i can do this.

 

[Conky]

You can pick up some adapters to let you plug into the normal 4 pin molex connectors. Here's a good place to buy them.

And you should have the front fan sucking cool air in and the fan in the back of the case blowing air out. So front to back as you put it.

 

[yiranhu]

Thanks for the website Beachboy! It seems that their 3 pin to 4 pin converter just takes +12V and Ground to +12 V and Ground of the 4 pin connector. That's easy to do since I have several 4 pin connectors I pulled off an old power supply (they should make extraction tools for those things...). All i have to do then is to make that adapter cable myself!

 

[Conky]

Originally posted by: yiranhu
Thanks for the website Beachboy! It seems that their 3 pin to 4 pin converter just takes +12V and Ground to +12 V and Ground of the 4 pin connector. That's easy to do since I have several 4 pin connectors I pulled off an old power supply (they should make extraction tools for those things...). All i have to do then is to make that adapter cable myself!

Yeah, that's the best way. :thumbsup:

I adapt my own fans too but hesitated trying to explain the process even though it's very simple.

 

[yiranhu]

So i'm guessing that if the feedback (or RPM monitoring pin) is not connected, the fan will just run at full speed (that's what I want since the fan's full speed is only 1500 RPM)? Kingwin's website is not technical enough at all... Once again, thanks Beachboy!

 

[Conky]

Originally posted by: yiranhu
So i'm guessing that if the feedback (or RPM monitoring pin) is not connected, the fan will just run at full speed (that's what I want since the fan's full speed is only 1500 RPM)? Kingwin's website is not technical enough at all... Once again, thanks Beachboy!

Yep, it will run at full speed unless your power supply has a "fan only" power connectors which I don't recommend using for main fans.