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Voltage Stressing A CPU?
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Source：Internet Author：Unknow Pubdate：2008-05-06
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Monkfish (Computer)
25 Nov 06 6:57
What I wish to understand is the short-term or long-term dangers posed to a modern CPU by increasing its supply voltage while maintaining normal operating temperatures (or even lower than normal using exotic cooing methods).
As I see it, a transistor or CPU can be destroyed by supplying a higher than rated voltage in one of two ways: the voltage itself (e.g. static discharge), or heat spikes caused by higher currents (e.g. thermal runaway).
If the chip is being cooled then how does a higher voltage actually stress the chip? Does it produce heat spikes that cannot be conducted away sufficiently quickly?
How exactly does a static discharge destroy a transistor (i.e. is it too simply heat-related at the molecular level)? How does a higher then spec supply voltage actually stress a chip?
Perhaps someone frequents this forum with a deep knowledge of transistors or CPUs? 字串8
Thanks you :)
IRstuff (Aerospace)
26 Nov 06 0:03
Higher voltages coupled with higher speeds from the cooling of the chip will aggravate a number of failure modes.
This was first tried with the 286, over 20 years ago, overclocked at 50% higher supply voltages. The CPUs lasted about 1 month. Cooling will not mitigate the failure modes.
TTFN
Monkfish (Computer)
26 Nov 06 9:32
Are you aware of any online sources that discuss these failure modes in detail?
IRstuff (Aerospace)
27 Nov 06 1:05
Go to the semiconductor manufacturers' websites. Their reliability reports list the types of failures. TTFN
字串9
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