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HOT GPU
A couple months ago I posted my 6800GT (inside a Dell XPS Gen 3, WinXP)
temps (according to NVIDIA Control Panel): Ambient temperatu 56 deg C GPU Co 81 deg C Slowdown threshold: 135 deg C Now I've found that if even a simple program like the 3D Pipes screensaver comes on, the temps jump to: Ambient temperatu 72 deg C GPU Co 112 deg C Slowdown threshold: 135 deg C The numbers will quickly drop to "baseline" levels once the screensaver is stopped, and will spike again if the screensaver is activated. In the NVIDIA Control Panel, when the temp goes above 100 deg C or so it will be shown in yellow instead of green, presumably indicating that this is not a good temp to be running at. I haven't noticed any symptoms with my system (locking up, reboots) at all, but surely this can't be normal operating temp, right? Perhaps the fan on the video card is malfunctioning? I did open up my case and de-dust the thing, but the temps haven't budged. What gives? Thanks! -- Charles C. Shyu http://home.earthlink.net/~shyuc/shyu.html |
#2
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HOT GPU
Charles C. Shyu wrote:
A couple months ago I posted my 6800GT (inside a Dell XPS Gen 3, WinXP) temps (according to NVIDIA Control Panel): Ambient temperatu 56 deg C GPU Co 81 deg C Slowdown threshold: 135 deg C Now I've found that if even a simple program like the 3D Pipes screensaver comes on, the temps jump to: Ambient temperatu 72 deg C GPU Co 112 deg C Slowdown threshold: 135 deg C The numbers will quickly drop to "baseline" levels once the screensaver is stopped, and will spike again if the screensaver is activated. In the NVIDIA Control Panel, when the temp goes above 100 deg C or so it will be shown in yellow instead of green, presumably indicating that this is not a good temp to be running at. I haven't noticed any symptoms with my system (locking up, reboots) at all, but surely this can't be normal operating temp, right? Perhaps the fan on the video card is malfunctioning? I did open up my case and de-dust the thing, but the temps haven't budged. What gives? Thanks! Run the same test with the PC case open, and see if the temperatures change. That the temperature drops quickly is by design, due to the differing speeds of the card's components depending on what the application is doing. (Rendering or Rastering) That you are reporting 112c under load on a 6800GT means something is not right. While it might work fine today, eventually that temp (and the ambient temp of 72c) will dry out capacitors and possibly damage traces from expansion/contraction. |
#3
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HOT GPU
My 6800gt ran too hot.
I took off the plate covering the fan and removed the WALL of dust blocking airflow. |
#4
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HOT GPU
'Charles. C. Shyu' wrote, in part:
| Now I've found that if even a simple program like the 3D Pipes screensaver | comes on, the temps jump to: | Ambient temperatu 72 deg C | GPU Co 112 deg C | Slowdown threshold: 135 deg C _____ The ambient temperature says it all. It is too high. The cooling solution result depends on the ambient temperature. An ambient temperature (I assume you mean temperature within the system case) is 30 to 40 C higher than it should be (unless you are located deep in a South African gold mine.) It is therefore only to be expected that the GPU temperature should be 30 to 40 C higher than it should be. For your under load example, 112 C - (30 to 40 C) = 82 to 72 C. Still high, but within reason. As 'ShutEye' posted, house cleaning is in order (and perhaps a check to see if the case fans are actually turning. Phil Weldon "Charles C. Shyu" wrote in message link.net... |A couple months ago I posted my 6800GT (inside a Dell XPS Gen 3, WinXP) | temps (according to NVIDIA Control Panel): | Ambient temperatu 56 deg C | GPU Co 81 deg C | Slowdown threshold: 135 deg C | | Now I've found that if even a simple program like the 3D Pipes screensaver | comes on, the temps jump to: | Ambient temperatu 72 deg C | GPU Co 112 deg C | Slowdown threshold: 135 deg C | | The numbers will quickly drop to "baseline" levels once the screensaver is | stopped, and will spike again if the screensaver is activated. In the | NVIDIA Control Panel, when the temp goes above 100 deg C or so it will be | shown in yellow instead of green, presumably indicating that this is not a | good temp to be running at. | | I haven't noticed any symptoms with my system (locking up, reboots) at all, | but surely this can't be normal operating temp, right? Perhaps the fan on | the video card is malfunctioning? I did open up my case and de-dust the | thing, but the temps haven't budged. What gives? | | Thanks! | -- | Charles C. Shyu | http://home.earthlink.net/~shyuc/shyu.html | | |
#5
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HOT GPU
"Mr.E Solved!" wrote in message
. .. Charles C. Shyu wrote: A couple months ago I posted my 6800GT (inside a Dell XPS Gen 3, WinXP) temps (according to NVIDIA Control Panel): Ambient temperatu 56 deg C GPU Co 81 deg C Slowdown threshold: 135 deg C Now I've found that if even a simple program like the 3D Pipes screensaver comes on, the temps jump to: Ambient temperatu 72 deg C GPU Co 112 deg C Slowdown threshold: 135 deg C The numbers will quickly drop to "baseline" levels once the screensaver is stopped, and will spike again if the screensaver is activated. In the NVIDIA Control Panel, when the temp goes above 100 deg C or so it will be shown in yellow instead of green, presumably indicating that this is not a good temp to be running at. I haven't noticed any symptoms with my system (locking up, reboots) at all, but surely this can't be normal operating temp, right? Perhaps the fan on the video card is malfunctioning? I did open up my case and de-dust the thing, but the temps haven't budged. What gives? Thanks! Run the same test with the PC case open, and see if the temperatures change. That the temperature drops quickly is by design, due to the differing speeds of the card's components depending on what the application is doing. (Rendering or Rastering) That you are reporting 112c under load on a 6800GT means something is not right. While it might work fine today, eventually that temp (and the ambient temp of 72c) will dry out capacitors and possibly damage traces from expansion/contraction. Thanks for the suggestion. I ran the computer with the case fully opened, and first found that the "idle" temps seem to be the same: Ambient temperatu 56 deg C GPU Co 78 deg C Mind you, my apartment temperature is 73 deg F = 23 deg C. Upon loading the 3D Pipes screensaver, the temp went to: Ambient temperatu 66 deg C GPU Co 94 deg C So the "idle" temp doesn't seem to change much with the case open, but the "load" temp does seem to significantly drop. Firstly, I'm wondering if the temperature shown by NVIDIA Control Panel is even correct. How the heck can the "Ambient temperature" be 57 deg C when my room is only 23 deg C? I put my hand in the case and it only feels slightly warmer than outside the case. Secondly, is there another way to verify these temperature numbers? If the reading is incorrect to begin with, I may be trying to diagnose something that's not even there. -- Charles C. Shyu http://home.earthlink.net/~shyuc/shyu.html |
#6
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HOT GPU
"Phil Weldon" wrote in message
link.net... 'Charles. C. Shyu' wrote, in part: | Now I've found that if even a simple program like the 3D Pipes screensaver | comes on, the temps jump to: | Ambient temperatu 72 deg C | GPU Co 112 deg C | Slowdown threshold: 135 deg C _____ The ambient temperature says it all. It is too high. The cooling solution result depends on the ambient temperature. An ambient temperature (I assume you mean temperature within the system case) is 30 to 40 C higher than it should be (unless you are located deep in a South African gold mine.) It is therefore only to be expected that the GPU temperature should be 30 to 40 C higher than it should be. For your under load example, 112 C - (30 to 40 C) = 82 to 72 C. Still high, but within reason. As 'ShutEye' posted, house cleaning is in order (and perhaps a check to see if the case fans are actually turning. Phil Weldon Phil, thanks for the input. I've run my system with the case open and posted the temp results earlier in this thread. I've cleaned up the dust as much as I've can, and yes, the case fans as well as the video card fans seem to be working. I'm now wondering if the temperature reading by NVIDIA Control Panel is (way) off for some reason... -- Charles C. Shyu http://home.earthlink.net/~shyuc/shyu.html |
#7
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HOT GPU
"Charles C. Shyu" wrote in message .net... Phil, thanks for the input. I've run my system with the case open and posted the temp results earlier in this thread. I've cleaned up the dust as much as I've can, and yes, the case fans as well as the video card fans seem to be working. I'm now wondering if the temperature reading by NVIDIA Control Panel is (way) off for some reason... -- Charles C. Shyu http://home.earthlink.net/~shyuc/shyu.html Just running your system with the case open might actually raise temperatures because there's no fluid airflow through the case. You'll get pockets of air sitting in places. If you run with the case off, blow a small house fan into the open side of the case to ensure that air is flowing everywhere properly. RF. |
#8
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HOT GPU
Charles C. Shyu wrote:
A couple months ago I posted my 6800GT (inside a Dell XPS Gen 3, WinXP) temps (according to NVIDIA Control Panel): Ambient temperatu 56 deg C GPU Co 81 deg C Slowdown threshold: 135 deg C Now I've found that if even a simple program like the 3D Pipes screensaver comes on, the temps jump to: Ambient temperatu 72 deg C GPU Co 112 deg C Slowdown threshold: 135 deg C from expansion/contraction. Thanks for the suggestion. I ran the computer with the case fully opened, and first found that the "idle" temps seem to be the same: Ambient temperatu 56 deg C GPU Co 78 deg C Mind you, my apartment temperature is 73 deg F = 23 deg C. Upon loading the 3D Pipes screensaver, the temp went to: Ambient temperatu 66 deg C GPU Co 94 deg C So the "idle" temp doesn't seem to change much with the case open, but the "load" temp does seem to significantly drop. Firstly, I'm wondering if the temperature shown by NVIDIA Control Panel is even correct. How the heck can the "Ambient temperature" be 57 deg C when my room is only 23 deg C? I put my hand in the case and it only feels slightly warmer than outside the case. The "ambient temp" readout is the temperature in the immediate vicinity of the motherboard mounted temperature sensor, which will be significantly higher than the temperature ambient to your person, assuming you aren't sitting inside your case. Also called "System Temperature" it controlled by the Winbond or other brand specific sensor chip which is an integral part of your system board. Secondly, is there another way to verify these temperature numbers? If the reading is incorrect to begin with, I may be trying to diagnose something that's not even there. You can use any number of third party temperature sensor monitors: MBM, Speedfan (which never worked for me), Rivatuner(?), Powerstrip(?). Often times motherboard compatibility is specific to the monitoring application (and version) used. Of course, ntune and nvmonitor work with nvidia chipsets. It is likely you can run multiple monitoring programs side by side, to compare results. Be aware, the temperatures reported are not actual "temperatures" in the sense that you might think. The sensor's circuits reports a number from 1-255 depending on the resistance in the sensor, and that result is translated to a familiar temperature scale. They are accurate only to the resolution of 3 degrees Fahrenheit, by design. Some do have greater resolution, down to 0.1 degree Fahrenheit, by virtue of reporting a value of 1 to 4K or some other larger number. While absolute temperatures are relevant, since resolution is poor, you must not rely on snapshots, you must inspect temperature logs to see what the peaks are, when they are, and how the system responds to increased thermal load by checking the slope of the temperature over time over load, that way you more accurate determine if your problem is rooted in: 1) convection 2) conduction 3) radiation Radiation of heat from the components will heat up other components, making even more heat, and convection of air currents is the primary way to move that heat away from the hot spots and out the case. I know this sounds basic, but you have to make sure that not only do you have case fans working in tandem, but that the resultant air current is actually occurring where you need it most: back of you video card, over your mosfets, over and through your CPU HSF, over and through your PSU. You could have the best case fans made, but if they are only moving a portion of the air in side the case, and not that portion you need, when additional thermal load is added, the GPU temp and System temp will spike dramatically, but stay normal at idle. While GPU outboard thermal exhaust fans are excellent (by local conduction and convection built into the unit, not adding to the case thermal load), they only solve half the problem, since the back of the video card does not benefit from the gpu exhaust fan's convection, regardless if there are heat pies and other fancy ram coolers on the back of a card. In most PC cases, that void between the PCI-E slot and the CPU HSF is a hot spot with little convection and much radiation, that the power moving mosfets are generally close to that location, adds to the thermal load. Pay particular attention to that area on your mobo, especially if your PSU does not have a down-side opening with a fan to assist in convecting that air up and out the back of the PSU. Long and short of it is more fans does not necessarily mean lower temps, but more convection in your specific trouble spots, common to most pcs, will lower your load temps. btw, the sensor on your video card is likely a thermistor mounted directly under the chip itself, though I seem to recall some sort of actual in die sensor mentioned somewhere, but not on the GeForce 6 series? Someone might know the facts on which sensor design is in which models. |
#9
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HOT GPU
Long and short of it is more fans does not necessarily mean lower temps,
but more convection in your specific trouble spots, common to most pcs, will lower your load temps. btw, the sensor on your video card is likely a thermistor mounted directly under the chip itself, though I seem to recall some sort of actual in die sensor mentioned somewhere, but not on the GeForce 6 series? Someone might know the facts on which sensor design is in which models. Lots of good info, but I'm still not convinced that I'm actually dealing with a problem here. I downloaded nTune to see if it gave a different GPU temp reading, but it gives the same as NVIDIA Control Panel, which I guess is to be expected? So I'm still left wondering if the temp reading is correct or not... -- Charles C. Shyu http://home.earthlink.net/~shyuc/shyu.html |
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