From owner-freebsd-hackers@FreeBSD.ORG Mon Dec 29 16:37:49 2003 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id CCE4116A4CE for ; Mon, 29 Dec 2003 16:37:49 -0800 (PST) Received: from amrita.pacific.net.sg (amrita.pacific.net.sg [203.120.90.219]) by mx1.FreeBSD.org (Postfix) with SMTP id 9134043D54 for ; Mon, 29 Dec 2003 16:37:47 -0800 (PST) (envelope-from oceanare@pacific.net.sg) Received: (qmail 8845 invoked from network); 30 Dec 2003 00:37:45 -0000 Received: from unknown (HELO maxwell2.pacific.net.sg) (203.120.90.192) by amrita with SMTP; 30 Dec 2003 00:37:45 -0000 Received: from pacific.net.sg ([210.24.202.108]) by maxwell2.pacific.net.sg with ESMTP <20031230003745.KRRU13917.maxwell2.pacific.net.sg@pacific.net.sg>; Tue, 30 Dec 2003 08:37:45 +0800 Message-ID: <3FF0C8D8.3040205@pacific.net.sg> Date: Tue, 30 Dec 2003 08:37:44 +0800 From: Erich Dollansky Organization: oceanare pte ltd User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.5) Gecko/20031007 X-Accept-Language: en, en-us, de MIME-Version: 1.0 To: Martin Cracauer References: <20031225224609.A5326@cons.org> <3FEF2D62.8010906@acm.org> <20031229170255.A87023@cons.org> In-Reply-To: <20031229170255.A87023@cons.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit cc: freebsd-hackers@freebsd.org cc: Tim Kientzle Subject: Re: Power consumption in desktop computers X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Dec 2003 00:37:49 -0000 Hi, Martin Cracauer wrote: > Tim Kientzle wrote on Sun, Dec 28, 2003 at 11:22:10AM -0800: > >>Ouch! I've tested a bunch of 'business-grade' desktops around >>my office, and they all run 40-60 watts during normal use (not >>including monitor) with peak power at boot time up to 70-80 watts. >>This includes some P4s with lots of memory, CD-RWs, etc. >>(The one exception is an AMD Duron system; it seems that >>the AMD processors are uniformly power-hungry.) > > > I wonder how that works. > > I finally got ahold of a datasheet of P-4 power consumption: > http://support.intel.com/support/processors/pentium4/sb/CS-007999.htm#Table2 > The table shows the Processor Thermal Design Power. The CPU will dissipate much less during normal operation and can dissipate even a bit more as worse case. This number is important to the hardware developer only. The actual power can go down to less than 10% if the CPU is idle. > Are these business-grade ones maybe equipped with mobile P-4s? No, it is just the fact that modern CPU are most of the time just idle. Erich