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system fans vs. power fan headers?

Beau

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system fans vs. power fan headers?
« on: July 16, 2011, 11:00:34 pm »
What's the difference? My board has:
3 pin (SYS_FAN1)
+
4 pin (SYS_FAN2)
+
 3 pin power fan header (PWR_FAN).

I'd also like to turn down the RPMs on my 120mm front case fan to reduce noise soemtimes. The Green utility thingy seemed to want to cut back on the CPU while reducing the fans and I didn't like that. Non-Gigabyte "SpeedFan" software didn't list my board.

Thanks.
GIGABYTE GA-Z68X-UD3-B3 motherboard, rev.1, BIOS ver.8.
Intel Core i5-2400 Sandy Bridge 3.1GHz.
G.SKILL Ripjaws X Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600.
WD SATA hard drive.
EVGA GTS 450 GPU.
ASUS CD/DVD DRW-24B1ST SATA 24.
Corsair PSU CX600.
Cooler Master Elite case.

Dark Mantis

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    • Dark Mantis
Re: system fans vs. power fan headers?
« Reply #1 on: July 17, 2011, 10:49:34 am »
Hi

The main difference between the 3 and 4 pin fan headers is that the 4 pin are  speed controllable and can be read out via the BIOS if the correct fan is fitted.

Sysfan2 is only half the speed of the other fans.
Gigabyte X58A-UD7
i7 920
Dominators 1600 x6 12GB
6970 2GB
HX850
256GB SSD, Sam 1TB, WDB320GB
Blu-Ray
HAF 932

Gigabyte Z68X-UD5-B3
i7 3770K
Vengeance 1600 16GB
6950 2GB
HCP1200W
Revo Drive x2, 1.5TB WDB RAID0
16x DLRW
StrikeX S7
Full water cooling
3 x 27" Iiy

Beau

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Re: system fans vs. power fan headers?
« Reply #2 on: July 17, 2011, 11:30:32 am »
Thank you.
GIGABYTE GA-Z68X-UD3-B3 motherboard, rev.1, BIOS ver.8.
Intel Core i5-2400 Sandy Bridge 3.1GHz.
G.SKILL Ripjaws X Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600.
WD SATA hard drive.
EVGA GTS 450 GPU.
ASUS CD/DVD DRW-24B1ST SATA 24.
Corsair PSU CX600.
Cooler Master Elite case.