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P5WD2E- PREMIUM D-805 PC shuts off by itself
for no apparent reason pc just shuts off by itself . I have a Zalman
fan. what should my readings be? what should my settings be? front case fan rear case fan, cpu fan,ps fan all spinning. .. I had the side cover off for a while but put it back after first shutdown. the case has a temp probe which i put on the heartsink on the mobo chipset has always read about 36C as is doing so now tooi, though may have been higher with cover off. it isn't even summer anymore. thought i heard a vibration ao that's why i hade cover off to investigate. seems to be one of the hard drives, but not severe and no apparent performance problems, right now mb says 100F cpu 120F please help |
#2
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P5WD2E- PREMIUM D-805 PC shuts off by itself
timO' wrote:
for no apparent reason pc just shuts off by itself . I have a Zalman fan. what should my readings be? what should my settings be? front case fan rear case fan, cpu fan,ps fan all spinning. . I had the side cover off for a while but put it back after first shutdown. the case has a temp probe which i put on the heartsink on the mobo chipset has always read about 36C as is doing so now tooi, though may have been higher with cover off. it isn't even summer anymore. thought i heard a vibration ao that's why i hade cover off to investigate. seems to be one of the hard drives, but not severe and no apparent performance problems, right now mb says 100F cpu 120F please help Possible reasons for shutdown, would be a CPU overheat problem, or the PSU shutdown because it detected a problem. CPU overheat is set at two levels. The first temperature is the "throttle" temperature, and the processor will slow its computing rate, to try to control the temperature. If that fails to work, and the processor gets hot enough, the THERMTRIP temperature is reached. At that point, as long as the THERMTRIP signal is wired to the motherboard logic, the motherboard should turn off the PSU. Throttle is around 65C, and THERMTRIP is at least 20C more than that. On some of the older P4 processors, THERMTRIP was up around 135C. You can get exact numbers from an Intel processor datasheet. 120F is about 49C, and no reason for the processor to get excited. So I suppose that leaves a PSU problem. Is the air coming from the PSU very hot ? Hotter than you would normally expect ? Have there been any startup issues with the PSU, or other warning signs ? Any funny smells from the PSU ? Have you visually inspected the capacitors on the motherboard, for leaking or bulging tops ? Maybe a problem with the motherboard, is causing the PSU to protect itself. Paul |
#3
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P5WD2E- PREMIUM D-805 PC shuts off by itself
On Oct 4, 2:45 am, Paul wrote:
timO' wrote: for no apparent reason pc just shuts off by itself . I have a Zalman fan. what should my readings be? what should my settings be? front case fan rear case fan, cpu fan,ps fan all spinning. . I had the side cover off for a while but put it back after first shutdown. the case has a temp probe which i put on the heartsink on the mobo chipset has always read about 36C as is doing so now tooi, though may have been higher with cover off. it isn't even summer anymore. thought i heard a vibration ao that's why i hade cover off to investigate. seems to be one of the hard drives, but not severe and no apparent performance problems, right now mb says 100F cpu 120F please help Possible reasons for shutdown, would be a CPU overheat problem, or the PSU shutdown because it detected a problem. CPU overheat is set at two levels. The first temperature is the "throttle" temperature, and the processor will slow its computing rate, to try to control the temperature. If that fails to work, and the processor gets hot enough, the THERMTRIP temperature is reached. At that point, as long as the THERMTRIP signal is wired to the motherboard logic, the motherboard should turn off the PSU. Throttle is around 65C, and THERMTRIP is at least 20C more than that. On some of the older P4 processors, THERMTRIP was up around 135C. You can get exact numbers from an Intel processor datasheet. 120F is about 49C, and no reason for the processor to get excited. So I suppose that leaves a PSU problem. Is the air coming from the PSU very hot ? Hotter than you would normally expect ? Have there been any startup issues with the PSU, or other warning signs ? Any funny smells from the PSU ? Have you visually inspected the capacitors on the motherboard, for leaking or bulging tops ? Maybe a problem with the motherboard, is causing the PSU to protect itself. Paul system is less than year old has this pc probe app i never use butr it tells you temps mobo is 122 this morning. no smells. like out of no where. thanks for the feedback |
#4
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P5WD2E- PREMIUM D-805 PC shuts off by itself
timO' wrote: On Oct 4, 2:45 am, Paul wrote: timO' wrote: for no apparent reason pc just shuts off by itself . I have a Zalman fan. what should my readings be? what should my settings be? front case fan rear case fan, cpu fan,ps fan all spinning. . I had the side cover off for a while but put it back after first shutdown. the case has a temp probe which i put on the heartsink on the mobo chipset has always read about 36C as is doing so now tooi, though may have been higher with cover off. it isn't even summer anymore. thought i heard a vibration ao that's why i hade cover off to investigate. seems to be one of the hard drives, but not severe and no apparent performance problems, right now mb says 100F cpu 120F please help Possible reasons for shutdown, would be a CPU overheat problem, or the PSU shutdown because it detected a problem. CPU overheat is set at two levels. The first temperature is the "throttle" temperature, and the processor will slow its computing rate, to try to control the temperature. If that fails to work, and the processor gets hot enough, the THERMTRIP temperature is reached. At that point, as long as the THERMTRIP signal is wired to the motherboard logic, the motherboard should turn off the PSU. Throttle is around 65C, and THERMTRIP is at least 20C more than that. On some of the older P4 processors, THERMTRIP was up around 135C. You can get exact numbers from an Intel processor datasheet. 120F is about 49C, and no reason for the processor to get excited. So I suppose that leaves a PSU problem. Is the air coming from the PSU very hot ? Hotter than you would normally expect ? Have there been any startup issues with the PSU, or other warning signs ? Any funny smells from the PSU ? Have you visually inspected the capacitors on the motherboard, for leaking or bulging tops ? Maybe a problem with the motherboard, is causing the PSU to protect itself. Paul system is less than year old has this pc probe app i never use butr it tells you temps mobo is 122 this morning. no smells. like out of no where. thanks for the feedback Motherboard temperature should not be significantly greater than ambient. If it is, then it indicates poor air flow through the chassis. What is the threshold temperature for the motherboard warning and trip? OTOH, a high motherboard temperature also indicates that the CPU temperature is also high since the measuring points are in relatively close proximity to each other. While CPU throttling would occur at around 65 deg C., this is a feedback control action and the CPU could well be spiking up to its maximum temperature at which it will shut down. |
#5
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P5WD2E- PREMIUM D-805 PC shuts off by itself
On Oct 6, 2:30 pm, GHalleck wrote:
timO' wrote: On Oct 4, 2:45 am, Paul wrote: timO' wrote: for no apparent reason pc just shuts off by itself . I have a Zalman fan. what should my readings be? what should my settings be? front case fan rear case fan, cpu fan,ps fan all spinning. . I had the side cover off for a while but put it back after first shutdown. the case has a temp probe which i put on the heartsink on the mobo chipset has always read about 36C as is doing so now tooi, though may have been higher with cover off. it isn't even summer anymore. thought i heard a vibration ao that's why i hade cover off to investigate. seems to be one of the hard drives, but not severe and no apparent performance problems, right now mb says 100F cpu 120F please help Possible reasons for shutdown, would be a CPU overheat problem, or the PSU shutdown because it detected a problem. CPU overheat is set at two levels. The first temperature is the "throttle" temperature, and the processor will slow its computing rate, to try to control the temperature. If that fails to work, and the processor gets hot enough, the THERMTRIP temperature is reached. At that point, as long as the THERMTRIP signal is wired to the motherboard logic, the motherboard should turn off the PSU. Throttle is around 65C, and THERMTRIP is at least 20C more than that. On some of the older P4 processors, THERMTRIP was up around 135C. You can get exact numbers from an Intel processor datasheet. 120F is about 49C, and no reason for the processor to get excited. So I suppose that leaves a PSU problem. Is the air coming from the PSU very hot ? Hotter than you would normally expect ? Have there been any startup issues with the PSU, or other warning signs ? Any funny smells from the PSU ? Have you visually inspected the capacitors on the motherboard, for leaking or bulging tops ? Maybe a problem with the motherboard, is causing the PSU to protect itself. Paul system is less than year old has this pc probe app i never use butr it tells you temps mobo is 122 this morning. no smells. like out of no where. thanks for the feedback Motherboard temperature should not be significantly greater than ambient. If it is, then it indicates poor air flow through the chassis. What is the threshold temperature for the motherboard warning and trip? OTOH, a high motherboard temperature also indicates that the CPU temperature is also high since the measuring points are in relatively close proximity to each other. While CPU throttling would occur at around 65 deg C., this is a feedback control action and the CPU could well be spiking up to its maximum temperature at which it will shut down. i bought another 80mm (red cold cathode) fan and stuck it onto the side of the chassis cover. there had been a plastic cowl there originally but i removed it so the zalman fan would fit. but there is room for this fan and it is blowing out .. so i have the zalman, the fan in the power supply, an 80mm on the back and a slightly larger fan in the front and this one. pretty noisey but it's not an issue.the sound of air moving. before i added the last fan i noticed the mb temp would actually go up if i had the side off the case. with the new fan installed and the case assembled the asus probe says cpu is 47C and the mobo is 27C the case has a temp display and i placed the sensor in the fins of the mobo chipset. it is noe 23C the new fan dropped the mobo temp 10C. i must've bought the wrong fans and ps because I am unable to monitor or adjust any of the fans except the cpu one. how do you know if a case ps or fan is fully compliant with ASUS and/ or ASUS probe? thanks for the feedback any way no more sudden stops. |
#6
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P5WD2E- PREMIUM D-805 PC shuts off by itself
timO' wrote:
i bought another 80mm (red cold cathode) fan and stuck it onto the side of the chassis cover. there had been a plastic cowl there originally but i removed it so the zalman fan would fit. but there is room for this fan and it is blowing out . so i have the zalman, the fan in the power supply, an 80mm on the back and a slightly larger fan in the front and this one. pretty noisey but it's not an issue.the sound of air moving. before i added the last fan i noticed the mb temp would actually go up if i had the side off the case. with the new fan installed and the case assembled the asus probe says cpu is 47C and the mobo is 27C the case has a temp display and i placed the sensor in the fins of the mobo chipset. it is noe 23C the new fan dropped the mobo temp 10C. i must've bought the wrong fans and ps because I am unable to monitor or adjust any of the fans except the cpu one. how do you know if a case ps or fan is fully compliant with ASUS and/ or ASUS probe? thanks for the feedback any way no more sudden stops. To monitor a fan, the fan must have a three wire cable on it. A lot of case fans have two wires, and the RPM signal is missing. Without an RPM signal, the hardware monitor will read zero for the channel. The CPU fans are usually pretty good, and those have the RPM signal on them. So at the very least, you should be seeing a figure for the CPU fan speed. The other issue is fan speed control. If a product offers "QFan", that means the CPU fan speed is adjusted by some means. If the product offers "QFan2", that means the CPU fan and one other fan header, are adjusted. The CPU fan speed would be related to the measured CPU temperature. The chassis fan speed would be controlled by the "Motherboard Temperature" or closest equivalent measure. Be aware, that the retail Intel fan, already has one control method built in. A third party heatsink/fan might be missing that feature, so the behavior will be a bit different. The Intel fan has a thermistor inside the fan hub. It samples the case air temperature. The hotter the case air gets, the faster the Intel CPU fan spins. On the other hand, the Asus control algorithm, measures the CPU temperature (diode based, and measured by the hardware monitor chip). When the CPU hits maybe 50C, the Asus control should speed the fan up. It is the combination of the built-in Intel feature in the fan hub, plus the voltage level fed by the Asus control, that determines the actual fan speed. If QFan is disabled, the Intel feature will still work, and the fan will gradually speed up, as the case air temperature increases. I generally let my fans run full speed. I have one really noisy fan, and for that one, I put a fixed voltage reducer in series with the 12V feed to the fan. (You can buy a Zalman FanMate II to do that, but I built my own from 1N4000 series diodes. Seven diodes in a row, drops 5 volts of voltage level. I got the diodes for $0.10 each.) So my fans run at the same speed all the time, which I find less irritating than listening to fans spool up and slow down again, every minute of the day. My CPU never goes above about 43C. My computer case, is only 4C warmer than the room air. HTH, Paul |
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