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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!newshost.telstra.net!act.news.telstra.net!psgrain!news.uoregon.edu!news.rediris.es!news.belnet.be!news.vub.ac.be!swsbe6.switch.ch!surfnet.nl!howland.reston.ans.net!newsjunkie.ans.net!newsfeeds.ans.net!news.lava.net!usenet From: john@mlh.com (John Shalamskas) Newsgroups: comp.unix.bsd.freebsd.misc,alt.comp.periphs.mainboard.asus,comp.sys.ibm.pc.hardware.systems,comp.os.linux.hardware,comp.sys.intel Subject: Re: PCI bus freq with CPU freq at (X * 40)Mhz? Date: Fri, 08 Mar 1996 20:58:07 GMT Organization: MLH Consulting Lines: 30 Message-ID: <4hq70p$j81@malasada.lava.net> References: <DnpJqF.82n@info.elvisti.kiev.ua> <4hg8sa$1jn@heist.demon.co.uk> <Dns7BK.DBI@ritz.mordor.com> <4hhh1s$pn@heist.demon.co.uk> <4hie07$70i@uriah.heep.sax.de> Reply-To: john@mlh.com NNTP-Posting-Host: dialup044.lava.net X-Newsreader: Forte Free Agent 1.0.82 Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:15208 alt.comp.periphs.mainboard.asus:12245 comp.sys.ibm.pc.hardware.systems:28851 comp.os.linux.hardware:32773 comp.sys.intel:67060 j@uriah.heep.sax.de (J Wunsch) wrote: >iain@heist.demon.co.uk (Iain Baird) writes: >> : Reduce the life expectancy? >The biggest risk is that you don't need to notice the problem >immediately. The most fatal source of failures on an overheated chip >are whiskers in an Al conductor layer that finally break an insulation >layer, hence causing a shortcut, or so-called ``electro migration'', >thinning out a conductor layer, which causes it to overheat the more >until it's broken. > >Both effects mostly happen with local hot spots on the chip. > >joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE The general rule of thumb for semiconductors is that lifetime is halved for every 10 degrees Celsius that the operating temperature rises. Does anyone know what happens to the temperatures inside CPU chips when the clock doubles? All it takes is one hot spot to develop, and poof! No more CPU. John John Shalamskas http://www.mlh.com/ john@mlh.com dba MLH Consulting phone (808) 521-3141 1620 Keeaumoku St #701 pager 288-2799 Honolulu, HI 96822 "Lucky I live Hawaii!" FAX/Data 534-0579