Hallo Ivanko, Du schriebst am Sun, 19 Aug 2012 03:11:12 +0500:
> Switching heat production from one part to another > in seconds will constantly stress them thermally, > ======================== > Not be a problem for devices dissipating 95..130W - these issues are Especially then it _will_ be a problem. The area where this high power originates is much _smaller_ than the die, and heats up this spot quite fast. If it jumps around fast, the heat can spread until it comes back, if it stays put for times of seconds, the peak temperature will be a lot higher than the average chip temperature. > definitely taken when designing. Certainly - the design is done so it will last around the required time under worst case conditions, where the operating time will be on the order of a few years real time, and maybe one year or less operational. Most machines will not run all the time, after all. > definitely taken when designing. Have You often encountered a damaged Not personally because of thermal damage - but I know of several that failed without a recognizable cause. Can you definitely rule out thermal overstress? > CPU but static electricity or improper installing into its socket ? Most - at least desk top - chassis are made of sheet metal, and to mount anything, you _have_ to touch some port of it, so this reduces the probability of a static discharge by an appreciable factor. Of course, it is always good practice (and one should get use to) _first_ touching a conductive part of the unit where a chip is to be inserted, and only then fiddling its pins into the proper holes. > Even enormous Vcc can hardly damage modern CPUs :) Hardly - even moderate overvoltage _will_ damage modern CPUs quite fast. After all, power goes with the square of the voltage, and common (core) voltages have gone way below one (1) Volt by now. If you meant to say "static discharge voltage", well, it depends. It's also mostly not _voltage_, but _charge_, and common amounts of charge caused by touching aren't so very high. These can _usually_ be absorbed by the sturdier connections, like - of course - power supply, or I/O pins that operate at some higher voltage level anyway. It will rather _not_ be tolerable for such pins as the connections to the RAM chips, also operating at low voltage. I would rather take any possible precaution on inserting a new CPU into a board than risk a static discharge damage, which can go undetected for quite some time until suddenly rendering that expensive part unoperational. (BTW, I _did_ do such things already, after all, I'm actively working in this field;) -- (Weitergabe von Adressdaten, Telefonnummern u.ä. ohne Zustimmung nicht gestattet, ebenso Zusendung von Werbung oder ähnlichem) ----------------------------------------------------------- Mit freundlichen Grüßen, S. Schicktanz ----------------------------------------------------------- ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ mseide-msegui-talk mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mseide-msegui-talk
