Why is motherboard does not have 4 x 4 pin headers

bulldog147 · 16 Jul 2010 at 22:43

I just curious of why is all motherboard doesn't come with 4 x 4 pin headers (useful for PWM fans) as they only had 1 x 4 pin on the cpu header, while the rest of other 3 pin on the system1, system2 and power pin headers.

The fan controller is useless and they only do 3 pin connector! (not 4)

Because I would like to use 2 x 2000RPM (4 pin PWM) so I can use it to lower the both fans down around 1000RPM when not using overclocking.

setter · 17 Jul 2010 at 01:53

Cost, well thats my opinion, but if you want to use up to 3 x 4 pwm 4 pin fans, buy an akasa PWM splitter cable.

http://www.overclockers.co.uk/showproduct.php?prodid=CB-031-AK&groupid=701&catid=48&subcat=

Ive used it to power 3 PWM fans, 2 on a cooler an a rear exhaust case fan, currently have one with a pair of akasa vipers on my TRUE on my i7, full speed control, eezy peezy mate.

liquidex · 17 Jul 2010 at 01:59

Tbh bulldog you should ask setter about your problem with the PWM splitter cables as he actually has them

Setter if you have time, mosey on here http://forums.overclockers.co.uk/showthread.php?t=18164933

setter · 17 Jul 2010 at 02:12

Ive replied liqidex mate on that thread you posted. Glad to help.

liquidex · 17 Jul 2010 at 02:16

Thanks, though its actually bulldog whos the one who needs the help slightly further down the thread on why the cable doesn't work for him

setter · 17 Jul 2010 at 02:21

Very strange mate, ive found it to be a very simple cable to use, ive used it with 3 x sharkoon silent eagle se fans, 400-1200 rpm, (extremely rare), now on akasa vipers, my motherboard is an asus p6t dlx v2, i have asus qfan enabled in bios, im sure gigabyte have something similair on their x58 series boards.

bulldog147 · 17 Jul 2010 at 04:27

Viper fan no1 4 pin pwm connected to case fan white label marked
Viper fan no2 4 pin pwm connected to case fan white label marked
connect to motherboard white label marked was plugged into cpu pin header (motherboard)
connect to psu white label marked was connect to psu connected and the cpu fan (white label marked) was not in use.

I getting 2 fans of vipers reading at fan no1 at 1100rpm (with pmw) and other vipers reading at fan no2 at 1900rpm (how to get this down to 1100rpm) ??

Maybe I not set it up in a proper way ? I don't like 2 vipers running at full speed if not using overclocking, bit annoying with too noisey fans at high speed.

liquidex · 17 Jul 2010 at 14:00

Would think you need at least one fan connected to the one which has the cpu fan label, so put one of your viper fans to that. I would presume it needs that to use the PWM of that fan to send to the other case fans.

thingemajib · 17 Jul 2010 at 14:23

my foxconn has 3 4pin PWM fan headers, but it seems i can only control two of them from the bios...

Tikkabhuna · 17 Jul 2010 at 15:53

thingemajib said:
my foxconn has 3 4pin PWM fan headers, but it seems i can only control two of them from the bios...

My UD5 doesn't allow control of my case PWM fan. Seems a bit pointless. I would love it if there were two CPU PWM fan headers next to each other at the top for push pull. It would make my day.

bifday2k · 17 Jul 2010 at 16:55

OLDPHART said:
Right to set up the PWM Splitter -

1.Connect molex to PSU.
2.The one marked motherbroad goes to CPU Header.
3.The fan thats pushing the air through the cooler connect to the one marked CPU.
4.The fan thats pulling the air through the cooler connects to one marked case fan.
5.Set Bios to PWM.

Hope this helps.

Said better then i can, so quoted it.

Its exactly how i have mine, but instead both vipers pulling, as i use a dual rad. Bascily one of the fans has to be connected to the one market cpu cooler on the spilter, for pwm to work, even if non are even on a cpu cooler.