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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!hunter.premier.net!news.jmls.edu!chi-news.cic.net!nntp.coast.net!fu-berlin.de!zrz.TU-Berlin.DE!cs.tu-berlin.de!uni-erlangen.de!irz401!uriah.heep!news From: j@uriah.heep.sax.de (J Wunsch) 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: 5 Mar 1996 22:08:07 GMT Organization: Private BSD site, Dresden Lines: 24 Message-ID: <4hie07$70i@uriah.heep.sax.de> References: <DnpJqF.82n@info.elvisti.kiev.ua> <4hg8sa$1jn@heist.demon.co.uk> <Dns7BK.DBI@ritz.mordor.com> <4hhh1s$pn@heist.demon.co.uk> Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) NNTP-Posting-Host: localhost.heep.sax.de Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Newsreader: knews 0.9.3 Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:14979 alt.comp.periphs.mainboard.asus:12033 comp.sys.ibm.pc.hardware.systems:28677 comp.os.linux.hardware:32390 comp.sys.intel:66718 iain@heist.demon.co.uk (Iain Baird) writes: > : Reduce the life expectancy? > I haven't experienced any such failures either. The risk was > mentioned in a followup to an article I posted some time ago. > IIRC, the gist was that if you clock something faster, it runs > hotter. 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. -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)