CPU Overheating
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Posted by Gary Brown on July 5, 2005, 9:57 pm
Please log in for more thread options My CPU (AMD 2800) has begun overheating. It runs about 68C when idle, hits the 72C threshold when working. The CPU heatsink is hot to the touch.The MB is 30C, just 4 degrees above room temperature. All fans including the CPU fan are working. It stopped twice last night. Until then there was no hint of a problem. I hadn't looked at the CPU temperature since the MB was first installed (fall of 2003) - it was normal. The PC Probe was not installed (it is now). I dropped the clock multiplier to 10 from 12.5 so there would be some function. That reduced the CPU temp to 61C. What would cause the CPU to start overheating? And what should I do about it? Configuration: AMD Athlon XP 2800 at 2145MHz (12.5 x 166) ASUS A7N8X Deluxe MB 512MB RAM 30GB Maxtor Drive 160GB WD Drive (shown at 38C) Thanks, Gary | |||||||||||||||||||
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Posted by Vanguard on July 5, 2005, 11:45 pm
Please log in for more thread options Did you check if the heatsink is actually against the CPU? Sometimes the plastic tabs on the socket break or the retainer snaps off so the heatsink is no longer pressed against the CPU. You said your CPU has "begun" to overheat but make no mention what the temperatures were before. So how do you know that it wasn't always overheating? Could the jobber (maybe you?) forgot to peel the tape off the thermal pad on the heatsink before affixing it atop the CPU. Or they forgot to put a rice kernel size gob of thermal compound on the heatsink, spread it, put it on the heatsink, twist a couple times, and then snap the retainer on the socket. It is possible that you have let dust accumulate so badly within the case that it is blocking airflow. Even if there is enough space for airflow between the fins of the heatsink, dust is a thermal insulator so you don't want it coating the surfaces from which heat is radiated. Get a can of air and blow out the fan and heatsink. The dust might stick to the fan blades so you can use an ear swab to wipe it off and then air dust again. Make sure the rear panel grill or fan are also clean, and the same for blowing out the power supply unit of dust (you can usually blow through it since opening it voids the warranty, if there is any time left left on the warranty). Make sure the front intake is clean. Arrange your cables to move them out of the airflow path, and orient ribbon cables so they are parallel to the airflow (so they don't act like big baffles that block the airflow). Make sure the ribbon cables, or any other cables, are laying against the CPU, its fan, or around the memory stick so they don't block the airflow. Do NOT use a vacuum cleaner inside your computer. Household vacuum cleaners create static due to the volume of airflow at the hose end (so insulating the metal end doesn't help since static will still build up on plastic). Very few of the "computer" vacuums are meant to be used inside since they also build up static. They are designed to be used to clean your keyboard, not circuit boards. Static resistant vacuums are expensive and hard to find. So just use a can of air to blow out the dust, and do it outside unless you really enjoy putting the dust back into your room. Even though the CPU fan is spinning, is it spinning fast enough? You could use SpeedFan, Motherboard Monitor, or a monitor utility provided by Asus to check the fan speeds. If you are running SpeedFan, another fan noise reducing program, or your BIOS has settings for fan speed control, or you inserted fan controllers inline with the power to the fans, disable or remove them or set them to 100% fan speed to see if they were running too slow. Check the PSU fan is spinning. The CPU fan running at 100% will still have problems cooling the CPU if the heated air doesn't get removed by the PSU fan (or a backpanel fan). Just what are you using to determine what is your CPU's temperature? Are you going into the BIOS screens to check its PC health screen that reports temperatures? Are you using an Asus monitor utility and, if so, are you sure you got the right one (so it is using the proper lookup table)? Are you using some 3rd party monitor utility? Using the wrong version of a utility could result in using the wrong lookup table. For example, if you use SpeedFan or Motherboard Monitor and pick a chipset that is wrong, the temperatures reported will be wrong. The readings in the BIOS screens don't rely on any software you may load in Windows. | |||||||||||||||||||
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Posted by Jason on July 6, 2005, 2:41 am
Please log in for more thread options > Hi,
I thought I would answer your question before I go up and thank those who
> > My CPU (AMD 2800) has begun overheating. It runs about > 68C when idle, hits the 72C threshold when working. The > CPU heatsink is hot to the touch.The MB is 30C, just 4 > degrees above room temperature. All fans including the > CPU fan are working. > > It stopped twice last night. Until then there was no hint of a > problem. I hadn't looked at the CPU temperature since the > MB was first installed (fall of 2003) - it was normal. The PC > Probe was not installed (it is now). > > I dropped the clock multiplier to 10 from 12.5 so there would > be some function. That reduced the CPU temp to 61C. > > What would cause the CPU to start overheating? And what > should I do about it? > > Configuration: > > AMD Athlon XP 2800 at 2145MHz (12.5 x 166) > ASUS A7N8X Deluxe MB > 512MB RAM > 30GB Maxtor Drive > 160GB WD Drive (shown at 38C) > > Thanks, > Gary > helped me with the same problem. Take the fan off of your heatsink, the heatsink is probably covered in dust, remove the dust, I took an air hose to my machine and blew it out. Reduced my CPU temp to about 48 cel. hats from about 75 - 79 cel before I did this. | |||||||||||||||||||
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Posted by Gary Brown on July 7, 2005, 1:13 pm
Please log in for more thread options >> My CPU (AMD 2800) has begun overheating. It runs about
>> 68C when idle, hits the 72C threshold when working. The >> CPU heatsink is hot to the touch. >> ... > I thought I would answer your question before I go up and thank those who
> helped me with the same problem. Take the fan off of your heatsink, the > heatsink is probably covered in dust, remove the dust, I took an air > hose to my machine and blew it out. Reduced my CPU temp to about 48 cel. > hats from about 75 - 79 cel before I did this. Thanks, that dropped the temperatures down to 55C idle, 66 busy. That is still higher than I think it should be. The Radio Shack heat sink compound might be suspect as was not completely cleaning the old compound off. What did you use for heat sink compound? Thanks again, Gary | |||||||||||||||||||
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Posted by kony on July 7, 2005, 6:44 pm
Please log in for more thread options On Thu, 7 Jul 2005 12:13:06 -0400, "Gary Brown"
>>> My CPU (AMD 2800) has begun overheating. It runs about
>>> 68C when idle, hits the 72C threshold when working. The >>> CPU heatsink is hot to the touch. >>> ... >
>> I thought I would answer your question before I go up and thank those who
>> helped me with the same problem. Take the fan off of your heatsink, the >> heatsink is probably covered in dust, remove the dust, I took an air >> hose to my machine and blew it out. Reduced my CPU temp to about 48 cel. >> hats from about 75 - 79 cel before I did this. >
>Thanks, that dropped the temperatures down to 55C idle, 66 busy. That >is still higher than I think it should be. The Radio Shack heat sink >compound might be suspect as was not completely cleaning the old >compound off. What did you use for heat sink compound? > >Thanks again, >Gary > Radio Shack compound is sufficient if not overapplied. However, if it is old, if separated and too thick, then it may need stirred up some. It is more difficult to do in a tiny metal tube but still possible, IF necessary. If you used a premium compound it might lower temps a couple degrees- not enough to be worthwhile unless you already had this other compound. | |||||||||||||||||||
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>
> My CPU (AMD 2800) has begun overheating. It runs about
> 68C when idle, hits the 72C threshold when working. The
> CPU heatsink is hot to the touch.The MB is 30C, just 4
> degrees above room temperature. All fans including the
> CPU fan are working.
>
> It stopped twice last night. Until then there was no hint of a
> problem. I hadn't looked at the CPU temperature since the
> MB was first installed (fall of 2003) - it was normal. The PC
> Probe was not installed (it is now).
>
> I dropped the clock multiplier to 10 from 12.5 so there would
> be some function. That reduced the CPU temp to 61C.
>
> What would cause the CPU to start overheating? And what
> should I do about it?
>
> Configuration:
>
> AMD Athlon XP 2800 at 2145MHz (12.5 x 166)
> ASUS A7N8X Deluxe MB
> 512MB RAM
> 30GB Maxtor Drive
> 160GB WD Drive (shown at 38C)
>
> Thanks,
> Gary
>
>