Gigabyte MA770T-UD3P fan headers question

[matchu]

Hellos. I'm looking into replacing the case fans on my Antec Nine Hundred, since they're extremely loud and obnoxious. I've looked into some thermalright fans that use 3pin headers and I have some questions about that

My motherboard (MA770T-UD3P) has 3 headers on it.

Sys_fan1 (GND / +12V speed control / Sense / Reserve)
Sys_fan2 (GND / +12V speed control / Sense)
Pwr_fan ((GND / +12V speed control / Sense)

So.... I am looking to getting *two* fans at least. They're 3-pin fans... and I'm not sure if I can plug them into any of these motherboard headers. As far as I can tell... they're all the same, but with different names and one with an extra pin that doesn't do anything =\

But I might be wrong.

If anyone could give me some advice, I'd really appreciate it! Thanks

 

[CMH]

There is no difference between all the 3 pin fan headers. Its more for monitoring purposes through software so you know which fan is spinning if you're into that kinda thing.

As for the 4 pin header, its for PWM controlled fans. You can still plug in a 3 pin fan into it, and it will work without a problem.

And while its not a problem here, you can plug a 4 pin fan into a 3 pin header. The only problem there is that the fan won't be PWM controlled.

 

[matchu]

Cool thanks for the info

Well, here's another related question then...

The case has 4 fans
200mm x 82cfm x 23.6dB
3 x 120mm x 39cfm x 25dB

If i replace the three 120mm fans with 3x this one
http://www.ncix.com/products/index.php?sku=37770
which runs at 15.8dB...

Will my case run a lot quieter?

Thanks!

 

[red1776]

Your machine will be as quite as the loudest fan, and BTW 25 db is a rather quiet fan.

 

[CMH]

Depends on who you talk to lol.

To me, anything over 21db is kinda loud, given the proximity of my case to where I sit.

personally, I think the noctua fans are superior to everything else, but getting quiet fans will be pointless if you've got a graphics card/PSU fan that screams, so check that out as well.

 

[matchu]

HIS Radeon 5850, Corsair TX750W, Phenom II X4 925

Those fans are usually pretty quiet. My case is close to where I sit, so i can hear the two front-mounted fans quite distinctly. Kind of annoying =(

 

[CMH]

hmm... high-end cards tend to be kinda loud.

But like you figured, positioning affects what you hear as well.

BTW, I use Noctua NF-S12B FLX for my case fan, and if their specs are anything to go by, they're about as quiet as you can get. I definitely can't hear mine over my GTX260.