Question CPU fan speed doesnt go above 800rpm

[adrian1818]

So yesterday i bought new cpufan and thermal paste (SilentiumPC Spartan 3 LT HE1012 , Thermal Grizzly Kryonaut (1 g) ), i already set it up and when my pc is 45Celsius my fans spinning around 700RPM, and when im gaming its 90C!!! and its spinning 800RPM, why? This fan should be spinning (800 - 2000) according to website. My friend told me that this is because i have weak psu(400W), so I tried to change my graphics card ( HD 7790 ) to an old one ( R7 240-No Pin to VGA) and it still spinning around 700RPM 🙁 I cant even increase my cpu fan speed ( Speedfan - no option for that, only gpu fan) (in BIOS i have no settings like that, only it shows how much it is spinning right now), so im fucked up 🙁 help pls

PC SPECS:

CPU : AMD 10 7800 3,6GHz
GPU: HD 7790 1GB
RAM: 12GB
PSU: 400W

 

[adrian1818]

Thats the old gpu i have-R7 240

 

[tennis2]

It's not your PSU's fault. There was already a fan on the CPU and fans draw 6W or less.

1. What did the old fan look like? Was it also a 4-pin connector?
2. Can you just strap the old fan to the heatsink with the clips?

 

[Paperdoc]

It is very likely your CPU_FAN header is configured to run at minimum speed, perhaps to be very quiet. You have not told us exactly where your new fan is plugged in, but I assumed it is into the CPU_FAN header. Tell us what mobo you have - maker and exact model number - and we can try to help.

 

[scout_03]

name and model of your motherboard .

 

[adrian1818]

it was a pre built pc, motherboard: Hewlett-Packard 2B17

 

[adrian1818]

 

[Paperdoc]

Some searching suggests this may have been a mobo made by MSI, model MS-7906 and used by both HP and Compaq. I could not find a manual for it or complete specs, but a similar mobo had a CPU_FAN header with THREE pins, meaning it could operate only in Voltage Control Mode, and a 4-pin SYS_FAN header which MIGHT use PWM Mode. Now, a 4-pin PWM Mode fan should work just fine on a 3-pin header because it never receives the PWM signal and cannot alter current flow through the windings, but it DOES receive a varying voltage from the 3-pin header's Pin #2. What you describe suggests that the voltage between Pin #2 (+ DCV supply) and Pin #1 (Ground) is constantly low - around 5 to 7 VDC - so that the fan is running at minimum speed. That kind of setting has been used as an option in fan configuration used for QUIET operation. So look closely in the CPU_FAN header settings and see if there is an option for another setting, preferably an Automatic or Normal profile that will change the fan speeds as needed.

 

[adrian1818]

oh, can you just explain this better? sorry i dont know english well, so what sould i do for getting better rpm?

 

[SgtScream]

Set the fan speed to PWM in the bios and take pictures of the fan settings in the bios and post here if you can't figure it out.
You can also plug the fan into molex on the psu with an adapter, instead of the motherboard. That would cause the fan to continuously run at 100% if you cannot configure the motherboard's bios to do so.

 

[adrian1818]

these are my bios settings

There is no option like se fan speed...

 

[Bearmann]

these are my bios settings

There is no option like se fan speed...

See if you can adjust that 770 RPM to 2000 RPM.

 

[adrian1818]

But i cant adjust that, i can only watch this... There is no option like adjust or something...

 

[SgtScream]

Plug the cpu fan into your power supply instead of the motherboard and it will run at 100%.

 

[tennis2]

I'd spend a couple extra bucks and get something like this which would allow you to control the fan speed to not be max when you're not gaming. 2000rpm is going to be noticeable.

 

[Paperdoc]

Thanks for all those photos. I see you have figured out that, for each major menu option across the top, you can highlight one of the items in the list and hit "Enter" or something to get to a second level of sub-menu. BY doing that you have shown us the the choices for items in the Power menu do not give you options to set anything, just to observe the values. I know that many users of complete commercial machines like those from HP, Dell, Compaq, etc. have found their BIOS Setup pages very hard to use with few user-adjustable choices.

Try that process under the Advanced menu for the Device Options sub-menu to see whether they offer any adjustment choices for your fan headers.