From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261239AbUCHVOz (ORCPT ); Mon, 8 Mar 2004 16:14:55 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261240AbUCHVOz (ORCPT ); Mon, 8 Mar 2004 16:14:55 -0500 Received: from 1-2-2-1a.has.sth.bostream.se ([82.182.130.86]:4299 "EHLO K-7.stesmi.com") by vger.kernel.org with ESMTP id S261239AbUCHVOy (ORCPT ); Mon, 8 Mar 2004 16:14:54 -0500 Message-ID: <404CE248.4050002@stesmi.com> Date: Mon, 08 Mar 2004 22:14:48 +0100 From: Stefan Smietanowski User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7a) Gecko/20040219 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Zwane Mwaikambo CC: Bjoern Schmidt , linux-kernel@vger.kernel.org Subject: Re: fsb of older cpu References: <404C4D32.1080609@uni-paderborn.de> <200403081714.04182.bernd.schubert@pci.uni-heidelberg.de> <404CD4E7.5050105@uni-paderborn.de> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Zwane Mwaikambo wrote: > On Mon, 8 Mar 2004, Bjoern Schmidt wrote: > > >>Hello and thank you for your answer. I determined that this cpu has a fsb of >>66MHz. The reason for my question was that i want to underclock the cpu. >>I think it would be better to change the multiplier instead of changing the fsb. >>Therefore i read the msr register 0x02ah, tilted bit 27 and wrote it back, but >>the cpu clock is still the same. Why does that not work? Is it possible to >>change the multiplier at runtime at all? > > > No, the multiplier is locked, you'll have more luck fiddling with the > front side bus. That would be the first P2/233 with a locked multiplier I've come across. My P2's ranging from 233 to 350 were never multiplier locked anyway. Celerons and P3's were multiplier locked however, maybe that's what you're thinking about. // Stefan