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Processor fan slow

My processor fan run slow 800rpm even the processor become hot fan still run 800rpm.I disconnect the number 4 pin .then the fan run motherboard is dp965lt.core2.memory 800mhz

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There is usually something in the BIOS settings that control the speed of the fan at certain temperatures. check those. Set it on auto if you can

Posted on Jun 05, 2008


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3 Answers

My computer is running slow

if it never used to run slow, and now does, then very high chance you have virus. run full virus scans, preferably 'online' , not using your installed antivirus scanner. if this fails to relieve the problem, restart into 'safe mode', and if problem does not persist anymore, it is most likely a driver issue. must uninstall devices from device manager, restart and see if problem is gone. if not, after uninstalling all major things , then use msconfig for 'diagnostic startup', if problem is resolved, figure out which one of the startups is causing it

Dec 09, 2013 | HP Computers & Internet

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Install extra fan

Tom, Tom,........Tom,

If I've told you once, I've told you..............

OH,......where was I?

Oh yeah............

You post solutions.
How about posting the need information for your query?

Laptop manufacturer name, and model number.
(Bottom of laptop - Model Number)

Right off hand; A laptop that uses two cooling fans already?
I don't know if I would tax the DC - DC circuit on the laptop anymore, by adding a third fan.

Is this fan to take the place of the fried harddrive?

The extra cooling fan would use at least 3 wires.
One for Power (Positive), one for Ground, (Negative), and a Sensor wire; so the laptop (BIOS) can speed the fan up when needed, or slow it down.

Positive ( + ) power pin, can be had from the Harddrive's interface it plugs into, on the laptop.
So can a Ground pin.
Not a sensor pin for speeding up, or slowing down a fan.

The internal cooling fan of a laptop, only uses two wires.
Positive, and Negative. It is the circuit the fan is plugged into, that can determine if the fan needs to be speeded up, or slowed down.

Point is, there isn't even a sensor pin FOR the installed cooling fans, to bring a jumper wire over TO the new fan.
(Which I wouldn't recommend anyway)

The two hardware components that give off the most heat, is the Processor (CPU), and graphics chipset. (GPU)

The CPU (Processor) is usually adequately cooled in a laptop.
The graphics chipset is usually, not.

Therefore, adding more surface area, to the Cooling Tube's small metal plate; is a method to help keep the laptop cooler.

Let's use an HP Pavilion dv6000 series of Notebook PC's, Cooling Tube for an example,

This is actually the entire cooling system.
Fan Assembly, finned Heatsink, and copper Cooling Tube.

The large metal plate all the way to the Left, that has the X-shaped mounting 'arms' on it, sits on the Processor.

Come up towards the Right, along the Cooling Tube, and the odd shaped metal plate sits on the graphics chipset.
(To the immediate left of the black Fan Assembly)

See how small that surface area is, that sits on the GPU? (Graphics chipset)
The surface area is increased by adding a small piece of copper sheeting. (APPROXIMATELY, 1-1/4th inches by 1-1/4 inches)
Thermal Paste is put on the graphics chipset. Then small piece of copper sheet, then Thermal Paste; then Cooling Tube.

If you have twin fans, then you should have twin Cooling Tubes.
I have seen four Cooling Tubes.
Two for one fan, and two for the other fan. Two go to the Processor, and two go to the graphics chipset.

At any rate I am just rambling until I know what laptop we are talking about.
Could be a reference to a Desktop PC for all I know........


May 16, 2013 | Computers & Internet

1 Answer

Cpu fan running but the mother board does not respond

Remove/disconnect everything (Ram, Cables, Power Supply, Battery, Processor, Pci cards, Display cards if there's one, etc.) from the motherboard, and after while, reconnect/put them on the motherboard again. Make sure you correctly installed the Ram and it's working. Also don't forget to connect both the power supply cables (20 pins connector and 4 pins connector) to the board. Now reboot your system, can you hear anything (beeps)? If this doesn't help, your nearest culprit to the problem is Display card. Good luck

May 21, 2010 | MSI K8MM-V Motherboard

2 Answers

Acer Aspire desktop AST135 cooling fan runs fast & slow - noisey

If the computer case, or Processor fan is noisy, it is due to the bearings are bad. The bearings are worn, and this allows the fan hub beneath the fan blades, to rub.

(If you gently rock the fan by lifting up on one side, and there is a perceptible amount of play, the bearings are bad)
Suggest you replace it.

For a case fan, just measure the dimensions of the fan's outside case.
Measure the Height and Length, plus the Width, (Thickness).
Look at the connector on the end of the fan's cable.

Most fan sizes are shown in Millimeters. (mm) If you are not familiar with the metric system, you can go online, and use a free Millimeters to Inches Converter.

1) 80mm = 3.14960 inches. Slightly over 3- 1/8th inches
2) 92mm = 3.62204 inches. Slightly under 3- 5/8ths inches
3) 120mm = 4.72440 inches. Slightly under 4- 3/4ths inches
4) 130mm = 5.11811 inches. Slightly under 5- 1/8th inches

See if it is a 2 pin connector, 3 pin connector, or 4 pin connector, on the end of the fan's cable.

(Fans operate on DC electricity. Just like the rest of the computer. DC is a Positive connection, and a Negative connection.

For a connector with 2 pins, that is all that is hooked up. Just power to the fan.

For a connector with 3 pins, the third pin is for the computer, to show what RPM's the fan is spinning at. {Revolutions per Minute}

For a connector with 4 pins, the fourth pin is a sensor connection.
The computer will speed up, or slow down the fan, according to what RPM is needed)

For a Processor fan the connection should be matched also.
When looking for a replacement Processor fan, it is the processor socket that the processor sits in, that you should look for.

You didn't state the full Model Number, such as AST135-US3104, or AST135-US3303, (It's on the back of the computer next to the Windows Product Key)
The two above models have an AMD Sempron processor.

They use a Socket 754.
(AMD Sempron 3100+, and AMD Sempron 3300+.
The AMD Sempron 3000+ that operates at 1.8Ghz, could be a Palermo Core that uses a Socket 754, or the model that uses a Socket 939)

Need help in finding a replacement computer case fan, or Processor fan? State so in an additional comment.

Jan 17, 2010 | Acer (AST135-U-S3100) PC Desktop

1 Answer

My processor has become slow and the fan sometimes works, sometimes it doesn't..makes a noise also...thanks


Replace the fan as soon as possible. The processor is running slow because it is overheating and the motherboard is cutting its speed to prevent the processor from burning up. Many motherboards have this throttling built in, they first try to make the fan go faster, if that does not work the board drops the speed to try to reduce the temp. be sure to check the fan in the power supply too, that one can also make a lot of noise if it is dirty.

I hope this helps, if so please rate our solution.

Corporate Computer

Dec 22, 2009 | Computers & Internet

2 Answers

Both radiator cooling fans won't turn on vehicle overheats

The fans come on only when hot or the AC is on. There are many fuses that have to be good for it to work. The fan relay should have 2 pins hot with the key on, The other 2 should be ground. with the key off one should be hot and the other can then be ground the other pins that are ground one of them is the fan. the other becomes ground when the computer turns the fans on. If you don't have a pin thats hot at the relay all the time then theres a blown fuse or even the power wire from the battery at the battery

Nov 02, 2009 | 1994 Buick Roadmaster

1 Answer

I have Dell GX280 system. My Fan produces more sounds and runs fast. System Hangs while processing and performs slow, causes processor nore hot. I pasted the Heat Sink Paste on processor that resuls in low...

More than likely your fan needs to be replaced. These small form factor Dells are know for problems like this. Warning! Do NOT attempt to blow out the CPU fan with canned air, as this will likely lodge dust particles in the axis of the fan causing it to drag and become louder!

Sep 09, 2009 | Dell OptiPlex GX280 PC Desktop

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Missing Processor Cores

Nice system, what kind of cooling do you have in there? How many fans etc...

Jan 11, 2008 | Intel S5000XVN Motherboard

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