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4 pin Phenom II AM3 stock cooler on a 3 pin AM2 OEM board with a 45W 4450B CPU - very low rpm. - Page 5  

post #41 of 68
Thread Starter 
Nintendo - again, I don't feel there would be much merit to editing. If someone is interested, everything is clear enough. Iif you personally wish to summarize and repost in some way, I have no objection.
post #42 of 68
Not read all the thread BUT if the rig is fine with the fan at low RPM's (temp wise!). Why do you want to speed it up. It maybe as mentioned that the heatload of the CPU isn't enough to spin the fan up and at (whatever) RPM it is at now IS FINE. Will just get louder when the RPM's go up and i don't think it really needs MOAR COOLING!biggrin.gif.

OR put the old 4 pin fan on the Phenom II heatsink. Best of both worlds.

Thanx.
Edited by Darkstalker420 - 9/23/12 at 2:22am
    
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post #43 of 68
Quote:
Originally Posted by alexrush38 View Post

Everything is correct in terms of paste application and seating. Does anyone have an explanation as to why the new cooler runs at such a low rpm?
Thank you very much.

I will try to compile an answer to what might be the cause of the low rpm (after some research on the net).

Αcording to Intel :

You have no FAN control due to the nature of the fan 4 Pin PWM being used on a 3 Pin connector.
Thus the fan FAN runs on manufacturer predetermined speed.



Processor(4-pin) fan header pinout:



Chassis/CPU fan header pinouts:



A further search on the net indicates as stated below:

4-pin Molex connector KK Family
This is a special variant of the Molex KK connector with four pins but with the locking/polarisation features of a 3-pin connector. The additional pin is used for a pulse-width modulation signal to provide variable speed control. These can be plugged into 3-pin headers, but will lose their fan speed control.

My best guess as to why your AVC fan spins between 600 and 700 RPM is due to fluctuations in the provided voltage (≃+12V) being caused by the MB trying to adjust the voltage for a 3 pin FAN.
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post #44 of 68
Thread Starter 
Many thanks, Scorpion, this seems very factual and intelligent. It was my feeling that minor fluctuations in fan speed, which seemed to occur alongside high temps, were not due to temp rises but to changes in voltage as the cpu had prolonged and intensive use. I didn't consider that the MB might be trying to adjust voltage for a 3 pin fan, rather, I thought the fan might be responding to cpu voltage rather than heat. Do you think this is possible?
Again, my many thanks.
post #45 of 68
The fan voltage circuitry is unrelated to the CPU voltage circuitry.

The most logical answer is that the BIOS is trying to regulate the FAN voltage, ergo trying to increase the FAN Rpm, when it sees increasing temperatures. But since there is no way for the FAN to receive a speed regulating signal it stays at idle Rpm and translates the increased voltage in slightly increased Rpm due to the nature that it is an PWM FAN and not an 3 Pin FAN.

Have you tried to connect and 3 pin fan to the CPU_FAN header and see how it behaves under different workloads ? (without compromising the cooling of your CPU of course)
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post #46 of 68
Thread Starter 
Thanks again for your kind reply.
I did have a 3 pin fan connected previously, for several months. I did not take note of increases in rpm under load, but I think it ran quite consistently at about 1500 rpm. During this use, I never noted core temps at above the low 40s (while with the AVC AM3 4 pin fan, they went into the high 60s).
post #47 of 68
I saw above that you have a NEXUS fan super-glued in your chassis which uses a 3 pin connector. If you are up to some testing i would like to suggest connecting this one to the CPU_FAN header for a few minutes to see how it behaves on steadily increasing temperatures, till the cpu reaches about 65°C, then shut the computer down connect the normal CPU fan and report back.

Also i would like to know what thermal grease/paste you used, if you don't mind.
Edited by Scorpion87 - 9/23/12 at 12:06pm
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post #48 of 68
Thread Starter 
Hi Scorpion - of course this is possible. However, I doubt the Nexus will do much in response to heat, because it already looks like it operating at it max spin.

http://www.nexustek.nl/NXS-nexus120mmrealsilentcasefan.htm

I'm not sure of the grease brand used, but I can get back to you on this. However, this is almost certainly not the issue, because the same brand/model of grease has been used for all the heatsinks that have been fitted onto this board.
post #49 of 68
Thread Starter 
HI Scorpion,
I did want to take up your thoughtful suggestion, so I've tried this out. Unfortunately, I was not successful here.
In the first instance, with the 12cm fan still connected directly to the power supply, plugging the 3 pin onto the board 3 pin cpu fan socket resulted in electrical arcing.
I then tried with the fan disconnected from the power supply and only plugged into the board with the 3 pin. In this instance the fan did not power up at all.
I've now returned the system to its pretesting configuration (amd cpu fan and the 12 cm running off the power supply).
post #50 of 68
Sad to hear that.

I guess you made sure that the system was powered down, disconnected from the power grid and discharged (pressing power button to remove any remaining static electricity) when you connected the 12cm fan onto the CPU_FAN header.

The fan itself can not do anything in response to heat, its just am medium of moving air, it is up to the MB/BIOS and the sensory input to determine the voltage provided, unless it is controlled manually (fan controller).

The fan not spinning up seems rather strange, since almost all aftermarket cooler use 12cm fans and bigger. I hope it didn't short out.
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