CPU FAN RPM is driving me insane.

July 1, 2011 at 19:30:25
Specs: Windows 7, AMD Phenom II 3.4 ghz Quad Core
I have just assembled a PC for my little brother, and CPU fan's RPM is just crazy.

Before I explain current situation any further, here is general spec of his PC.
CPU: AMD Phenom II, 3.4 ghz quad core black edition.
MoBo: ASUS M4A87TD/USB3 - amd SOCKET am3/ Chipset: AMD 870/SB850 etc etc.
8 gig memory (4gig x2, but currently using 32 bit windows untill 64 bit arrives in my mailbox)
700W power supply
GC - 5770 Radeon

Well, I first thought AMD's stock heatsink was defected or something, so I called them to get a replacement. After I installed the replacement, noise became 'little better' compare to the one came with CPU with slightly less RPM. However, it still is huge ear sore + unreasonably high.

It is sitting @ 4000 RPM with 45~50 c. usually, and would go down to mid~3000 RPM with 45~ c. time to time.

I am not running any program but Chrome and few other programs that shouldn't consume much of memory to cause RPM to go nuts.

While I type this, I also noticed that the CPU usage is somewhat high as well. spiking between 30% to 50% just w/ Chrome and world of warcraft background downloader.

I only have 1 frontal case fan, I thought that might be the problem, so I am running my computer without closing the case. (both sides open)

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July 1, 2011 at 20:34:41
I suggest you check your manual on how to configure the CPU fan settings in the BIOS.

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July 1, 2011 at 20:46:01
i went to bios and set it as "silent".

didn't change much.

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July 1, 2011 at 21:15:36
If you are using one fan it should be exhausting from the top rear not blowing in from the front bottom and with the side open you might as well have no fan at all. You want the air to flow across all components and you want to use the natural convection to help this. Heat will naturally rise so by exhausting at the top rear and placing the main intake vent at the bottom front the air will do this as long as the system is closed from the side, it will flow in, up, back and out.

Have you loaded your hardware drivers yet? This is really important since as soon as windows is loaded the motherboard drivers take over this functioning and will slow the fan while monitoring the CPU temperature. If you have not then Windows default will just run the fan fast like your BIOS does when you start up or shut down, just everywhere in between also.

Did you install the heat sink correctly? Was the thermal compound preapplied? Or did you apply it (or forget to apply it) correctly?

You have to be a little bit crazy to keep you from going insane.

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July 1, 2011 at 21:42:53
I will try close the case when 2 extra fans arrive on monday. Last tiem I tried it, i actually could feel the heat getting trapped inside the case, and as i open'd the case hot air flowed out. (w/ first heatsink that came with the cpu )

2. I instaleld drivers and other utilities (as far as i know. I installed almost everything that came with the MoBo cd)

3. yes I installed heat sink correctly + thermal compound was pre-applied.

few of my friends told me "eh, heatsink from AMD almost always sucks, just get one off newegg", would it possible this be the case? I mean, I got a replacement heatsink and it is hard to think they would send another defected one.

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July 2, 2011 at 07:03:02
How is adding more fans going to make your system more quiet? I doubt there was anything wrong with either of the 2 AMD heatsink/fans. The BIOS settings are the key. "Silent mode" isn't the only setting that needs to be configured. However, a CPU temp of 50C at idle is pretty warm & indicates that the HS/F was improperly installed. Idle temps should be in the 30s, unless you have an extremely warm room?

Fingers was exactly right with his response. You only need ONE case cooling fan & that's a rear exhaust fan. Just remove the useless front intake fan & move it to the rear. Also, running the system with the side panels removed renders the case fans ineffective. They need a closed environment to be able to do their job.

What type of case do you have? The "old"design with the power supply mounted near the top has much better cooling characteristics than the "new" design with the power supply at the bottom.

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July 2, 2011 at 10:35:38
One thing that wasn't mentioned is that if you bought a RETAIL version of the AMD processor the heat sink/fan was included. That heat sink may have had a thermal pad in place on the bottom surface. Did you remove the shipping film before installing the heat sink and did you clean off all the thermal pad residue before installing the replacement heat sink?

AMD cool and quiet is enable be default so the fan RPM only runs as fast as required to keep the CPU cool. If you installed wrong, the fan may try to compensate.

I have found the stock AMD cooling solution to be very quiet.

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