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Old 1 Week Ago   #1 (permalink)
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Default Help! Why is my CPU fan blasting full speed?

I have an MSI 790GX-G65, and I just got my Phenom II 955 back from RMA. My Zalman CNPS9700 fan, by default, blasts full speed really loud. In the past, I've been able to overcome this by going into the BIOS and doing CPU Fan Smart Target (or whatever it's called). Then it spins at low speed unless it starts getting really hot.

But for some reason, no matter what I do--BIOS or SpeedFan--I can't adjust the fan speed. Is it because the fan is 3-pin and not 4-pin? Do I need a converter or something? In an ASUS board I used, they allowed you to select whether the CPU fan was a 3-pin or 4-pin, but this MSI one doesn't seem to have that option.
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My "leftover" system in the works:
- MSI K9A2 CF v2
- Athlon II x2 250 (3.0GHz)
- 4 GB G.Skill 1066 RAM
- Geforce 9600GT
- WD Caviar Blue 500GB
- OCZ StealthXStream 500W
- IDE DVD burner
*Need: Case


System: Blackie
CPU
AMD Phenom II X4 955
Motherboard
MSI 790GX-G65 AM3
Memory
4 GB DDR3 OCZ Platinum
Graphics Card
2xHD5770 CF
Hard Drive
Barracuda+Caviar Blue (1 TB)
Sound Card
X-Fi XtremeGamer
Power Supply
Antec EA650
Case
CM 690
CPU cooling
Xigmatek Dark Knight
OS
Windows 7 Home Premium 64-bit
Monitor
LG 22" Widescreen LCD (2ms)
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Old 1 Week Ago   #2 (permalink)
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Is the fan connector on your motherboard a 4 pin connection? If so, you need a 4 pin connector on your fan. Did you plug the CPU fan onto the CPU fan connector (rather than NB fan, PSU fan, et cetera)? Just going over the basics.

How are you temps? Is the HSF seated properly?


EDIT: I have searched for a while for a 3 to 4 pin fan connector. It's just not possible.

3 pin fan connector pinout v. 4 pin fan connector pinout.

I have even tried bridging the "sense" and "control" pins on the 4 pin connector, and plugging it into a 3 pin, but this changed nothing.

Hope this helps.
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System: Ahora
CPU
Intel Core 2 Quad Q9550 Yorkfield @ 3.83Ghz
Motherboard
GIGABYTE GA-X48-DQ6
Memory
G.SKILL [2 x 2GB] DDR2 1100
Graphics Card
XFX NVIDIA GeForce 9800 GTX+
Hard Drive
WD Caviar Black [2 x 1TB], WD Caviar Blue [640GB]
Sound Card
Onboard Realtek ALC889A chipset [8 channels]
Power Supply
OCZ ModXStream Pro 600W
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Zalman CNPS9500 AT
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Windows 7 Pro [x64], Windows XP Pro [x86], Mac OSX
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ASUS VH242H 23.6" and Dell E156FP 15"

Last edited by mmparkskier : 1 Week Ago at 11:27 PM
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Old 1 Week Ago   #3 (permalink)
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Quote:
In the past, I've been able to overcome this by going into the BIOS and doing CPU Fan Smart Target
Just read the above post - agreed. Check where your cooler plug is attached and make sure its in the CPU fan header
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CPU
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Motherboard
Gigabyte EP45-UD3R
Memory
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Graphics Card
nVidia GTX 275 896 Mb
Hard Drive
Seagate 200Gb/WD BlueCavier 250Gb&500Gb
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Thermaltake 750W
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Xigmatek S126384 Thor's Hammer
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Last edited by Sethy666 : 1 Week Ago at 11:32 PM
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Old 1 Week Ago   #4 (permalink)
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Quote:
Originally Posted by mmparkskier View Post
Is the fan connector on your motherboard a 4 pin connection? If so, you need a 4 pin connector on your fan. Did you plug the CPU fan onto the CPU fan connector (rather than NB fan, PSU fan, et cetera)? Just going over the basics.

How are you temps? Is the HSF seated properly?


EDIT: I have searched for a while for a 3 to 4 pin fan connector. It's just not possible.

3 pin fan connector pinout v. 4 pin fan connector pinout.

I have even tried bridging the "sense" and "control" pins on the 4 pin connector, and plugging it into a 3 pin, but this changed nothing.

Hope this helps.
It looks like that first colored drawing...the mobo has 4 pins (with a little vertical plastic piece around the first three). In the past, I've had mobos like these where if you just put the 3-pin fan in the plastic piece pins, it would work normally. Not sure why this mobo insists on blasting full speed--maybe this is an excuse to get a better cooler haha.

Quote:
Originally Posted by Sethy666 View Post
So, whats changed with the cooler? Did they change the pin configuration or something? Was it 4 pin before and now its a 3 pin?
AFAIK, the cooler always had a 3-pin. Mine worked fine on previous mobos, but for some reason, this one seems to be picky about how many pins there are.
__________________
My "leftover" system in the works:
- MSI K9A2 CF v2
- Athlon II x2 250 (3.0GHz)
- 4 GB G.Skill 1066 RAM
- Geforce 9600GT
- WD Caviar Blue 500GB
- OCZ StealthXStream 500W
- IDE DVD burner
*Need: Case


System: Blackie
CPU
AMD Phenom II X4 955
Motherboard
MSI 790GX-G65 AM3
Memory
4 GB DDR3 OCZ Platinum
Graphics Card
2xHD5770 CF
Hard Drive
Barracuda+Caviar Blue (1 TB)
Sound Card
X-Fi XtremeGamer
Power Supply
Antec EA650
Case
CM 690
CPU cooling
Xigmatek Dark Knight
OS
Windows 7 Home Premium 64-bit
Monitor
LG 22" Widescreen LCD (2ms)
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Old 1 Week Ago   #5 (permalink)
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It's plugged into the CPU fan slot and the temps are in the mid 30s. It has 4 pins available, but in the past, having a 3-pin fan didn't seem to matter. I guess this mobo is pickier about it...maybe it's time for a Xigmatek Dark Knight, which I know has 4 pins.
__________________
My "leftover" system in the works:
- MSI K9A2 CF v2
- Athlon II x2 250 (3.0GHz)
- 4 GB G.Skill 1066 RAM
- Geforce 9600GT
- WD Caviar Blue 500GB
- OCZ StealthXStream 500W
- IDE DVD burner
*Need: Case


System: Blackie
CPU
AMD Phenom II X4 955
Motherboard
MSI 790GX-G65 AM3
Memory
4 GB DDR3 OCZ Platinum
Graphics Card
2xHD5770 CF
Hard Drive
Barracuda+Caviar Blue (1 TB)
Sound Card
X-Fi XtremeGamer
Power Supply
Antec EA650
Case
CM 690
CPU cooling
Xigmatek Dark Knight
OS
Windows 7 Home Premium 64-bit
Monitor
LG 22" Widescreen LCD (2ms)
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