Why the CPU "fever"

Not long ago, under the friend's egged, I also DIY computer. Although the spirit of "practical, adequate." "Principle, but a few sets of plans to save machine in my mind around, make me indecisive. Hey! What about it--take money to the computer city for a spin.
Saturday, I went to the computer city two laps, finally set a "package": CPU with CELERON433, Pan English motherboard (3VBA), Phillip Display (105G), 8.4G hard disk, xiaoying pa tnt16m graphics card. In the afternoon, with the help of friends, I finally assembled it well.
Looking at the computer at hand, the heart is really excited. But it didn't last, one day, I opened the USDM (Unified System Diagnostic Manager) on the control Panel and found the CPU temperature to be 73 ℃. The USDM is on the motherboard and allows you to observe the temperature (TEMP) of the CPU, the temperature (System TEM), and the CPU core voltage without opening the chassis. But at that time the system temperature is only 20 ℃, I did not overclocking, cpu why "fever"? Show errors?! or open the chassis to see what is going on. I touched the CPU with my hand, no, really hot. Install the fan, start the computer, and find that the fan is working properly. Is on the merchant's when--bought a block remark CPU. The next morning, I took the CPU to the computer city, asking for returns. Computer store owner is very enthusiastic, to find a similar computer, the CPU and fan installed a try, the CPU all normal, temperature of 24 ℃.
No way, observe for some time. Summed up the rule of CPU heating: When the computer in the "standby state" to "working state", the temperature of the CPU in 65℃~75℃, but soon dropped to 42 ℃ or so, tend to stabilize. Friends say not to toss, may be so, do not ignore it. But I think the problem is not resolved, the CPU is always unsafe. On one occasion, I unconsciously pressed the right mouse button on the "Super Jie Ba AutoPlay Server" icon in the executive bar and popped the option box, where the "Let CPU save on idle" item was not selected. Check it! Take a look at the temperature changes in the CPU in the USDM: The CPU temperature has 42 ℃ quickly drops to 25 ℃. At this time, my heart a happy, unexpectedly bothered me for several days is actually this small option. Strike the hot, quick. Check the CPU temperature by "standby" to "working state", and the CPU temperature is 63 ℃, five minutes later, to the field of 25 ℃. This time, though the problem could not be completely solved, it sent me a signal that there was a problem with the system setup. Open the Control Panel again to view power management. From this you can see that the system wait state was set to 30 minutes "monitor shutdown" set to 15 minutes, "hard drive off" set to 30 minutes. Open the chassis and when the computer is in standby (30 minutes later), the truth is finally out: The CPU fan stops turning. Back to "power management" will "system wait state" set to "never", and then see the CPU fan "never stop", open usdm look, the temperature is very stable, the CPU temperature is 25 ℃, the system temperature is 21 ℃.
All right, my friend. In your DIY machine, do not forget to set the system well, otherwise, the CPU's "small life" will unknowingly be you sent away in vain.