From owner-freebsd-current Fri Apr 10 15:10:36 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id PAA24661 for freebsd-current-outgoing; Fri, 10 Apr 1998 15:10:36 -0700 (PDT) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from horst.bfd.com (horst.bfd.com [204.160.242.10]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id PAA24630 for ; Fri, 10 Apr 1998 15:10:32 -0700 (PDT) (envelope-from ejs@bfd.com) Received: from harlie.bfd.com (bastion.bfd.com [204.160.242.14]) by horst.bfd.com (8.8.8/8.8.8) with SMTP id WAA28863; Fri, 10 Apr 1998 22:00:56 GMT (envelope-from ejs@bfd.com) Date: Fri, 10 Apr 1998 15:00:56 -0700 (PDT) From: "Eric J. Schwertfeger" To: Mike Smith cc: Gilad Rom , current@FreeBSD.ORG Subject: Re: ps segfaults since I overclocked. and worries. In-Reply-To: <199804102138.OAA01260@dingo.cdrom.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Fri, 10 Apr 1998, Mike Smith wrote: > > > > Well, to the best of my knowledge, the p166 and p200 were almost > > identical except the fact that intel test these prior to shipment, to make > > sure what processor can achieve what clock speed without burning. > > I think overclocking is a 99% fail-proof way to achieve better performance > > from your CPU(To a limited extent, ofcourse) without paying more money > > for something which is about the same. The comparison to an old car being > > raced is not applicable here, as processors at that level are Identical. > > Please correct me if Im wrong, Thanks :) > > You're wrong. > > There are a limited number of cases where the situation you describe is > valid. The typical error is to assume that this is universal, which is > completely fallacious. > > Exceeding the rated specification of electronic components exposes you > to the risk of functional or catastrophic failure. By doing so, you > *must* accept sole responsibility for your situation. Even as a rabbid overclocker, I still have to agree with Mike. The later P166/MMX's are happily overclockable, except that Intel isn't bonding all the pins, and it's still not a sure thing. The non-MMX is not so happily overclockable. Where you get into real trouble when overclocking the external clock rather than the multiplier is on the PCI bus, including the IDE interfaces. In fact, UDMA (actually loading the drivers, or enabling it in the kernel) and an external clock of 83.3Mhz is VERY BAD mojo. I've never seen that combo work, but I haven't tried much. Basically, if it works when not overclocked, but not when overclocked, I never blame the OS. Sure, my wife's P166 will boot DOS at 291Mhz, but just because it won't any real OS faster than 200 doesn't mean that DOS is a good OS and all other OS have bugs. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message