temprature problem

Posted on 2006-04-02
Last Modified: 2010-04-12
i have assembled a PC with the followin configuraion

intel 915 original motherboard
intel 3.0Ghz processor
256Mb display
1*3Gb RAM
250*3Gb Hard disk

my system having temprature problem

its giving warning message 'system zone 1 temprature exceeded its recommended maximum tempretor
how can i fix this
Question by:ammadeyy
    LVL 38

    Expert Comment

    I suppose what you would really have to do at the outset is to verify which component Zone 1 is referring to.

    Is this message being issued by a temperature monitoring utility like the "Intel Active Monitor"?
    Or is this message being issued from a black/white or blue/white screen after the computer crashes out?

    If you are using the Intel Active Monitor (Right-Click icon in the System Tray), then it allows you to set the temperature thresholds, but I DON'T recommend doing this UNLESS:
    (a) you previously fiddled with these settings and set them to a ridiculously low threshold like room temperature
    (b) you have verified that all the components ARE running at a suitably low temperature and that the sensor(s) is/are giving false readings.

    Here's what you should do:

    1. Check that ALL the fans are actually running
    Intel Active Monitor shows this, as seen in this screenshot as long as the fans are plugged into the proper motherboard sockets:   Do a visual as well, including the fan(s) in the power supply unit.

    2. Open the case by removing both sides and blow out any dust with a can of compressed air.  Observe the instructions, because some will spray solvent all over the board if you hold them upside down.  Dust acts as a quilt and doesn't allow heat to escape properly.  It is an enemy of computers, especially if it becomes trapped in the cooling fins of your processor's heatsink.

    3. When you assembled the computer, are you sure that you :
        (a) put thermal compound on the surface that mates the top of the processor with the bottom of the heatsink block
        (b) clipped the heatsink down properly.
    Pentium 4's usually come with a self-adhesive "thermal pad" that is a specific thickness so that a properly matched heatsink unit exerts just the right pressure when clipped down.  It flexes the board slightly, but too much can cause as much harm as too littles, so you must have a heatsink and fan designed for your type of Pentium processor.
    If you instead used thermal paste, then did you apply it properly?  It only needs a thin layer, because too much will squeeze out all over the top of the processor and may cause problems.

    4. Make sure that air can flow around the inside of the cas properly.  Round IDE cables are ideal replacements for the srtandard flat ribbon cables.  Generally you should have more air being sucked out at the back through the fans than is being sucked in through a front fan.  That way, the cool air is sucked right past the hardware components on its way out, rather than being forced into the case and remaining there for too long.  Make sure the computer is sited well away from central heating radiators, etc, or it defeats the purpose of having fans at all.  Also make sure that the fans are moving air in the correct direction.  I've accidentally fitted a fan the wrong way around where it blew air into the case from the back rather than sucking it out.  Test with a piece of paper for airflow.

    5. If you have a thermometer, place it inside the case somewhere near the centre and leave it in there.  Immediately you get the warning message, pull off the side of the case and quickly look at the temperature.
    You can find out maximum operational temperatures for all of your hardware from the manufacturers' support sites.  It is crucial that you know what temperature is considered too high for your particular processor.

    6. Boot into your CMOS Setup Screen (usually F2 or DEL at the first stages of boot), and look to see if there are any user settings for overheat cut-off.  Compare these with the maximum safe operational temperature specification for your processor and motherboard from the Intel site.  There may also be a real-time display of what the actual temperature is.  In the CMOS Setup Screen, your system won't be getting driven to the same degree as it will be during full operation, so don't take that as gospel and believe that the current temperature shown is what it will be when running in Windows and eg. playing games.

    7. When you assembled the PC, did you set the clock ratio's for the processor properly?  It could be running "overclocked" and be overheating because of that.  Normally this is set in the CMOS Setup Screen, and you would have to consult your motherboard manual for these multipliers.  There are some motherboards that use motherboard jumpers to set this, but I think yours is too modern for this.  I would have to check.

    Try or check these things first and let us know the details.


    LVL 38

    Expert Comment

    Some good info here about cooling:

    You have several different versions of Intel motherboard that use the 915 chipset in Desktops:

    Intel 915G Express Chipset
    Intel 915GV Express Chipset
    Intel 915GL Express Chipset
    Intel 915PL Express Chipset
    Intel 915P Express Chipset

    You will see the equivalent Intel model numbers for these listed here, with links to resources for each one:

    The 915 chipset boards seem to all have the LGA775 processor socket.
    You will find thermal data and specifications here:

    >>> "The internal chassis temperature for systems based on Pentium 4 processors in the 775-land package should not exceed 38°C when the chassis is used in a maximum expected room temperature of 35°C". <<<

    It looks like your 3.0 GHz processor should only be used if the "maximum internal case temperature" is less than 66.6 or 69.2 deg Celcius (depending on the processor model), and the temperature 0.3 inches above the centre of the processor's cooling fan should not exceed 38 deg Celcius.

    Your motherboard should have a 4-wire power connector from the processor fan to the motherboard connector, and this allows the fan speed to go up or down depending on the temperature.  If you used a non-compatible cooling fan, then this may not be working correctly.

    If you don't know the exact model number of your board, download and run the Intel Chipset Identification Utility:

    To find out exactly what processor is fitted, look for the sSpec Number on the box that the processor came in and enter it here:

    Or download and run the processor identifier utility:


    Author Comment

    my motherboard is D915GEV
    processor is LGA775

    Author Comment

    in the below link it says zone 1 is near processor

    processor fan i am using is the original fan.
    im thinking why zone 1 is having temprature problem
    LVL 38

    Expert Comment

    It sounds like an airflow problem to me.  If the processor itself was overheating, then that would be sensed by the diode right on the processor.  As you say, Zone 1 covers the area NEAR to the processor.  So if the AIR is too hot in that area, then that would cause the temperature alarm to be triggered.

    Just make sure that the fans are connected to the right pin-sockets on the board.

    There is a good large high-resolution photo of the board here:

    Front Fan connector (looks like J8J2) is at the left of the image just above the yellow/orange jumper cap.
    Rear fan connector 2 is at the top right of the image (J11A1)
    CPU Fan connector (J1F2) is along the bottom edge of the image just to the right of the memory slots
    Rear Fan connector 1 is probably the one hiding behind the white 4-pin power socket behind the USB/LAN port towards the right on the image.

    The sensor for Zone 1 AND Zone 2 is shown as No. 13 on page 5 of the product brief:
    and in the image on the page you provided the link to.
    What that is doing is sensing the air temperature close to the processor, and adjusting the fan speeds.

    You must have a look and see if there is anything covering it or deflecting proper cool air flow away from it.  The most likely possibility is a cable, but if your hard drive is mounted so that it is close to that sensor, then that might cause its heat to hang around the area of the sensor.

    You may have to add some kind of exhaust fan that fits into one of the available back plates, or fit a stronger fan in the rear to suck out the hot air faster.

    It is also possible that this is a faulty sensor.

    Author Comment

    i have 12v two cooling fans
    when i connect it to the motherboard it doesnt work
    so i used external 12v adaptor and its working
    a bigger fan back of the chasis, and a smaller fan in the front

    the fan in the makes the system cooler, and the small fan in front sucks air out

    and there is another small fan infront of hard disk as well

    i run the system for 10minutes and here is the reading

    processor zone 44°C
    system zone 1 37°C
    system zone 2 33°C

    and its going up when i run the system for longer period

    as BillDL have said it should not rais 38°C im still worried about this reading

    any sugestions?

    Author Comment

    i have remove the cover of the chasis, and run for 20 minutes
    now the reaings are

    processor zone 42°C
    system zone 1 36°C
    system zone 2 32°C
    LVL 38

    Expert Comment

    Several observations:

    1. >>> I have removed the cover of the chassis, and run the system for 20 minutes.  Now the readings are ..." <<<
    The problem with that is that removing the covers isn't allowing the fans to create the airflow inside the case, so the readings are not a true indication of what will happen when the case sides are replaced.

    2. The fan fitted to cool the hard drive could actually be pulling hot air off the drive and blowing it right over the sensor for Zone 1 if they are fairly close to each other.  If they are, carefully hold your hand or a small strip of paper between them for a few minutes while the system is running and see if the temperatures change.

    3. >>> "the small fan in front sucks air out" <<< It should really be sucking air INTO the case from the outside air at the front of the case, and the bigger fans at the Back of the case should be helping it to pull the air right through the case past the components, and finally out of the back of the case as warmer air.
    If your description of the fan arrangement is accurate, then the fans at the front AND back are both trying to suck the air out of the case at the back and the front, and there will be a whirlpool of hot air building up as they fight against each other.

    Reverse the fan in the front of the case and see what happens to the airflow.

    See the image on this page:

    4. When you connect the chassis fans to the proper motherboard connectors, they don't work???  That is NOT what you want to happen.  Those connectors SHOULD supply enough power to run the fans.  The motherboard might be faulty, but just double-check things before assuming this:

    Download the technical specification document for your board:

    Go to figure 17 on page 62, and you will see the connectors.  The key is on the next page, but you are looking for :
    B - Rear chassis fan connector 2
    N - Rear chassis fan connector 1
    S - Processor fan connector
    X - Front chassis fan connector
    EE - ATX fan connector (optional)

    The Processor Fan Connector uses 4-pins/wires, but the Chassis Fan Connectors use 3-pins/wires.  All fan connectors supply +12 Volt DC, and the connector on the wires from the fans SHOULD only be able to push onto the motherboard connectors in one direction.  Details on Page 65 and 74 of the technical specification document.

    The location of the fan connectors Figure 17, page 62
    The location of the fan connectors and sensors for thermal monitoring Figure 13, page 35
    The signal names of the processor fan connector Table 25, page 65
    The signal names of the chassis fan connectors Table 26, page 65

    "Thermal Considerations" start on Page 76:

    "A chassis with a Maximum internal ambient temperature of 38 deg. C at the processor fan inlet is a requirement.
    Use a processor heatsink that provides omni-directional airflow (as shown in Figure 24) to maintain required airflow across the processor voltage regulator area".

    Page 77:

    "Ensure that proper airflow is maintained in the processor voltage regulator circuit.
    Failure to do so may result in damage to the voltage regulator circuit.
    The processor voltage regulator area (item A in Figure 25) can reach a temperature of up to 85 deg. C in an open chassis.
    Figure 25 shows the locations of the localized high temperature zones".

    CMOS Setup (BIOS) starts on Page 85 (F2 to boot to CMOS Setup Screen during POST).
    I don't see any specific details about turning the variable fan speed controller on or off, but I haven't yet studied it fully.

    LVL 38

    Expert Comment

    Hmmm,  I said that all the chassis fan connectors have 3-pins.
    The motherboard photograph shoes that the REAR Chassis Fan Connector No. 2 (top right corner - J11A1) ALSO has 4-pins.

    Author Comment

    i run the system for 3hrs and the readings are

    processor zone 50°C
    system zone 1 43°C
    system zone 2 38°C

    the bigger fan is suckin  the air out
    and two small fan is pullin air in

    when i connect this fans to the motherboard it doesnt work
    but when i connect smaller fans it works
    LVL 38

    Accepted Solution

    The processor isn't overheating, but it's a bit hotter than I would normally like it to be.
    Try disconnecting one of the smaller fans on the front, but make sure that the big one on the back is running.
    It might be that the two front fans are pulling in too much air and causing poor circulation because the one at the back can't extract it fast enough.

    I think you might have to experiment a bit to try and get a good air circulation.  Maybe the case is badly designed and isn't allowing good flow through it.  You need to try and get some cool incoming air to be directed onto zone 1, and this might mean trying to put the small front fan(s) in a different position if possible.

    The readings with the case sides off indicate that the inside of the case is not being vented properly.

    Author Comment

    i am using dell poweredge 600SC chassis

    i change all internal components

    LVL 38

    Expert Comment

    Thank you for the points, ammadeyy.

    It's strange, because that is a big case that gives the moard and components some free space to catch the airflow.
    You can see from this image:
    what I was saying about how flat ribbon cables can obstruct free air movement.  That is why it is a good idea to change them for round ones.
    I can't see if there is a fan at the front of that case, or if it is just the grille cover, but look down in the front half of the case behind the hard drives:
    The area behind the fan aperture looks to me as if it is mostly blocked by what seem to be quick-fit drive bays or supports for long cards (the blue things):
    The ribbon cables shown here:
    would surely stop a lot of the incoming air from the front of the case from going anywhere useful.

    If your motherboard mounting position is similar to that image above (ie. the processor is roughly in the same position as that one, then the fan in the back SHOULD be pulling a lot of hot air off the processor and the area around it (ie. Zone 1).

    If your processor is much higher up, like just under the power supply unit, then the power supply gets very hot and if air isn't flowing properly, then some of that hot air could be radiating onto the still air surrounding Zone 1.  Remember that the Power Supply Unit's own fan should also be drawing air from inside the case and pushing it out the back so that it cools the power supply at the same time.

    Going back to a previous linked page regarding thermal issues:

    It does say the following:

    "If you've checked for proper airflow and performed the other troubleshooting steps listed above and you still consistently receive high temperature alerts in Zone 1 or Zone 2:

    - If you are using Intel Active Monitor, you may increase the temperature threshold.  You can safely increase the Zone 1 or Zone 2 threshold up to 60 Degrees Celsius (140 Degrees Fahrenheit).
    - If you are using Intel Desktop Utilities version or earlier, upgrade the software to the latest version, which sets the Zone 1 and 2 default thresholds to 65°C.

    It is not recommended that you increase the Processor Zone threshold".

    It seems now that you have probably reached this stage.  Check the "thresholds" again, and perhaps increase them as indicated above.



    Author Comment

    what is the recomended temprature?

    i modify the casin and put another AC powed fan to suck the hot air out

    now the temprature is

    processor zone 44°C
    system zone 1 38°C
    system zone 2 34°C

    before it was

    processor zone 50°C
    system zone 1 43°C
    system zone 2 38°C


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