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#1
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CPU too hot on boot up
I have a quad core (9450) on a P5E3. PC Probe shows a big spike on
the CPU temp after booting up. It's drops pretty quickly though. Stll it's booting up around 70 degrees centigrade and then drops down to about 30 just idling. Not sure why it runs so hot. |
#2
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CPU too hot on boot up
wrote:
I have a quad core (9450) on a P5E3. PC Probe shows a big spike on the CPU temp after booting up. It's drops pretty quickly though. Stll it's booting up around 70 degrees centigrade and then drops down to about 30 just idling. Not sure why it runs so hot. The only conclusive condition, is when the processor is loaded. For example, run Prime95 while in Windows. This will start a thread per core and run the cores pretty close to 100% each. http://www.mersenne.org/gimps/p95v255a.zip Now, while Prime95 is running, check the temperature. Did the temp shoot up ? Is it now over 70C ? If so, you need more cooling, or you need to check that your Vcore is not set incorrectly, or your core frequency is too high. Power is proportional to F*C*V**2 where F is core frequency (actually it is toggle rate but that is too hard to explain), V squared is the Vcore value squared, and C is a constant of proportionality. The equation is normally used to compute power on a CMOS gate, but can be extended as a relationship, to describe processors doing constant work. (i.e. As long as you are comparing the processors doing the same amount of work, such as both cases running Prime95, then the proportionality should apply.) Since power is proportional to Vcore squared, the power is strongly dependent on voltage used. If you have decent cooling, the temp shouldn't go over 70C. At that temperature, the processor might start to throttle. To evaluate throttling, you can use a program like RMClock from rightmark. RMClock download page - yes, there is a free version. http://cpu.rightmark.org/download.shtml Demo of RMClock on a processor which is throttling because it is too hot. The downward spikes are the loss in performance, due to clock throttling. http://www.xbitlabs.com/articles/cpu...c-guide_7.html It could be something as simple, as one of your push-pins on the heatsink is not holding properly, and the heatsink isn't sitting flat on the CPU. Paul |
#3
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CPU too hot on boot up
Paul, thanks for your suggestions - Prime ran less then a minute
before the temp was 92 and climbing. The hsf is seated fine , it is the stock cooler, but still while I expect not so great results with it, at stock right now for boot into OS it's hitting 70. Something is odd. Vcore is 1.12 - 1.2 This is the default bios 4.0.2 for my motherboard. So still digging. Stuart |
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CPU too hot on boot up
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#5
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CPU too hot on boot up
On Jul 26, 5:26*pm, Paul wrote:
wrote: Paul, thanks for your suggestions - *Prime ran less then a minute before the temp was 92 and climbing. The hsf is seated fine , it is the stock cooler, but still while I expect not so great results with it, at stock right now for boot into OS it's hitting 70. *Something is odd. Vcore is 1.12 - 1.2 This is the default bios 4.0.2 for my motherboard. * So still digging.. Stuart Has the heatsink/fan been removed and reinstalled a number of times ? Any chance the thermal paste or pad is messed up ? If the processor was at 92C, then if the heatsink was making good contact, the fins of the heatsink should be going up in temperature as well. You'd also expect the exhaust air from the CPU fan to be a little on the warm side. If you use your finger as a sensor, do the observable conditions seem consistent with the temperature readout software ? Or is the heatsink cold to the touch ? * * Paul Now , that's interesting but let me understand - why if at 92c you say heatsink is making good contact ? However that's an excellent question because it's cool to the touch. So, no the conditions are not consistent with the readout. Also the HSF has not been removed. I put down a nice coat of arctic before laying the heatsink down. Stuart p.s. Aside from that this system is driving me nuts . The combo of this board and the ATI 4870 is pretty unstable at this point. That's a whole other issue. |
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CPU too hot on boot up
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#7
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CPU too hot on boot up
On Jul 26, 7:17*pm, tobe wrote:
wrote: Now , that's interesting but let me understand - why if at 92c you say heatsink is making good contact ? However that's an excellent question because it's cool to the touch. So, no the conditions are not consistent with the readout. Also the HSF has not been removed. *I put down a nice coat of arctic before laying the heatsink down. By "a nice coat" how thick do you mean. *It is recommended, IIRC, that the coat should be 0.003" thick! *Too thick a coat can cause overheating, too! Well I didn't have my micrometer but I believe it was about close enough. Not thick. I am going to reset it but I think replacing the HSF wouldn't be a bad idea either. I |
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CPU too hot on boot up
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#9
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CPU too hot on boot up
On Jul 27, 3:20*am, Paul wrote:
wrote: On Jul 26, 7:17 pm, tobe wrote: wrote: Now , that's interesting but let me understand - why if at 92c you say heatsink is making good contact ? However that's an excellent question because it's cool to the touch. So, no the conditions are not consistent with the readout. Also the HSF has not been removed. *I put down a nice coat of arctic before laying the heatsink down. By "a nice coat" how thick do you mean. *It is recommended, IIRC, that the coat should be 0.003" thick! *Too thick a coat can cause overheating, too! Well I didn't have my micrometer but I believe it was about close enough. *Not thick. I am going to reset it but I think replacing the HSF wouldn't be a bad idea either. *I I think when you remove it, you're going to see a pattern in the AS that tells you it wasn't making good contact. If you clean off the AS, put a single rice grain of AS in the center of the CPU, install the heatsink, remove it and examine the pattern, the AS probably won't have spread over the entire surface. And that implies a problem with the fit. * * Paul I readl through an AS pdf online. It shows a line in the center, longer then a rice grain but short of the height of the chip. The heat spreader is apparently wider then the actual cpu so it need not spread corner to corner. Unless this document is incorrect I'll try that. Stuart |
#10
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CPU too hot on boot up
On Jul 27, 5:13*am, " wrote:
On Jul 27, 3:20*am, Paul wrote: wrote: On Jul 26, 7:17 pm, tobe wrote: wrote: Now , that's interesting but let me understand - why if at 92c you say heatsink is making good contact ? However that's an excellent question because it's cool to the touch.. So, no the conditions are not consistent with the readout. Also the HSF has not been removed. *I put down a nice coat of arctic before laying the heatsink down. By "a nice coat" how thick do you mean. *It is recommended, IIRC, that the coat should be 0.003" thick! *Too thick a coat can cause overheating, too! Well I didn't have my micrometer but I believe it was about close enough. *Not thick. I am going to reset it but I think replacing the HSF wouldn't be a bad idea either. *I I think when you remove it, you're going to see a pattern in the AS that tells you it wasn't making good contact. If you clean off the AS, put a single rice grain of AS in the center of the CPU, install the heatsink, remove it and examine the pattern, the AS probably won't have spread over the entire surface. And that implies a problem with the fit. * * Paul I readl through an AS pdf online. *It shows a line in the center, longer then a rice grain but short of the height of the chip. *The heat spreader is apparently wider then the actual cpu so it need not spread corner to corner. *Unless this document is incorrect I'll try that. Stuart Postedit - removed HSF, cleaned and prepped with AS kit both, reseated, on load completion in Windows BEFO 67C CURRENT 47. About to try Prime |
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