Date: Wed, 20 Sep 2000 21:21:39 -0700 From: David Burton <odyseus2000@earthlink.net> To: Lee Weng Seng <wseng@cyberway.com.sg>, freebsd-hardware@FreeBSD.org Subject: Re: Power consumption Message-ID: <20000920212139.A72859@slick.earthlink.net> In-Reply-To: <00de01c0200a$f222c2a0$dd7475cb@tdprk>; from wseng@cyberway.com.sg on Sun, Sep 17, 2000 at 02:20:29AM %2B0800 References: <00de01c0200a$f222c2a0$dd7475cb@tdprk>
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No easy answer for this question other than using a wattmeter or ammeter with a logging feature taking logs over a few days of normal use and averaging that would give you the best estimate of power consumption. However you can taking the specs for every device in your system (dont know if you can find them for the motherboard because it would probably depend on theamount of memory and processor, consult mainboard docs or contact manufacturer) they will be rated for their power consumption. If they are rated in watts or milliwatts then convert to like units and add. If they are rated with a voltage and amperes(or milliamps) then multiply voltage by amps to find watts to find the power consumption. Besure to use the appropiate units. Some devices may be rated with two figures : nominal and maximum, nominal is at standby(on but not being used) max. is when the device is at peak activity. So for an estimate perhaps use an average of nominal and max. and of course multiply the figure by the hours of use. In the US, it is all bill at kilowatts per hour, so if your locality uses something else you will have to convert it to the appropriate thing. And of course you can only get either the maximum power consumption or best guess with this method. Because all your hardware is not being used fully all the time. This method is not being written by an expert. There could be something I am overlooking or not fully explained. All this comming from an electrician converted to electronics tech, who likes to play with computers and is a wannabe sys admin. oh yeah, I didnt finish a computer science degree. Anyone want hire me? Sun, Sep 17, 2000 at 02:20:29AM +0800, Lee Weng Seng wrote: > I've just set up my newly assembled system running fbsd 4.1. There's two > things that I wish to find out but not sure how. > > I wish to determine whether the power supply that came with the casing is > sufficient. > > I'm also trying to find out the power consumption of my system so that I can > pay my landlord accordingly. > > thanx > leews > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hardware" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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