Date: Tue, 3 Oct 1995 09:33:44 +0100 (MET) From: Andreas Klemm <andreas@knobel.gun.de> To: joerg_wunsch@uriah.heep.sax.de Cc: andreas@knobel.gun.de, terry@lambert.org, davidg@root.com, mark@grondar.za, hackers@FreeBSD.ORG Subject: Re: make world on FreeBSD-stable impossible. cc1: ... signal 11 Message-ID: <199510030833.JAA19413@knobel.gun.de> In-Reply-To: <199509291919.UAA04815@uriah.heep.sax.de> from "J Wunsch" at Sep 29, 95 08:19:08 pm
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> As Andreas Klemm wrote: > > > > Well not only a fan. A fan with a heat sensor. So I thought I'm > > relatively save, not overheating the P90. And I think this is the only > > thing that might happen, when overclocking a chip. > > You're overclocking the chip? Well, it's not only the temperature of > the case that might cause you harm. The more subtile problems do > arise out of local overheating on the chip (remember that the thermal > flow inside silicon is rather limited), which can finally cause a > total damage of the chip due to shortcuts or interruptions in some > conductor layer. The most suspectible layers are the top-level two Al > layers with the intervening insulator layer. The Al expands about one > order of magnitude more than silicon, causing "hillocks" which can > finally break through the insulator layer. Uh, thanks for the detailed description, what might happen. Fortunately it turns out, that my P90 has survived the 120 MHz burnin. I changed main memory and burst cache memory Sunday evenig and hadn't any problems since then. I made 4 make world's and am running a real stable -stable now (I hope with fingers crossed :-). > The second reason for heat-caused failures is called "electro > migration". Basically, hot spots of Al conductor pads start to get > thinner, and consequently even hotter. This is much comparable to the > burndown of the tungsten wire in a lightbulb. It's generally a long- > term failure, but caused by overheating. > > IMHO, overclocking the chip is not worth it. Ok, ok !! I'm convinced now ;-))) So I think I can say a very big "Thank you" to all of you, who helped me in the last days ! -- $$ apsfilter - magic print filter 4lpd @home : andreas@knobel.gun.de $$ ftp://sunsite.unc.edu @work : andreas@sunny.wup.de $$ /pub/Linux/system/Printing/aps-491.tgz knobel: >>> powered by FreeBSD <<<
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