[time-nuts] Modern motherboard with RS232 port

lists at lazygranch.com lists at lazygranch.com
Sun Aug 19 15:34:37 EDT 2012


Power factor. 

-----Original Message-----
From: Tom Knox <actast at hotmail.com>
Sender: time-nuts-bounces at febo.com
Date: Sun, 19 Aug 2012 13:19:20 
To: Time-Nuts<time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] Modern motherboard with RS232 port


Hi Ed;
I may not have had enough coffee yet, but if Volt X Amps = Watts why would there be a difference?
Best Wishes;
Thomas Knox



> Date: Sun, 19 Aug 2012 12:35:51 -0600
> From: ed_palmer at sasktel.net
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Modern motherboard with RS232 port
> 
> It's important to remember that on a computer, the wattage shown has no 
> relationship to the wattage pulled from the socket.  The numbers shown 
> are maximum values.  You have to measure the power draw and you have to 
> measure it in volt-amps, not watts because that's how residential power 
> is measured (at least in North America).  Buy an energy meter that shows 
> volt-amps.  They're relatively cheap - typically less than $50.
> 
> Ed
> 
> On 8/19/2012 11:06 AM, Chris Albertson wrote:
> > This sounds like a newer version of the board I use.   The thing to check
> > is if the CPU heat sink has a fan or not.  Having no fan indicates that the
> > CPU is not using much power.  It also removes a common failure point.
> >
> > To reduce power even more.  On an NTP server you can unplug the keyboard,
> > mouse and monitor and if you have other servers on the LAN configure one as
> > a "boot server" and have it run TFTP then your NTP server does not need a
> > disk drive.  It can run off a "RAM disk".  This makes it very fast, even
> > faster than a SSD and it saves some cash.  Makes backup easy too as there
> > is nothing to backup if there is no local storage.  If you don't have a
> > TFTP server use a small notebook size disk drive. Even a 80GB drive is
> > overkill.  You can also boot from a USB thumb drive and run a RAM disk.
> >
> > It is worth it to look at your electric bill to find how much you pay for
> > power.  Here I'm at $0.21 per KWH.  A full size PC server can use 250W or
> > more.  There are 8760 hours in a year so you get $460 per year to run that
> > 250W PC.  The little Atom will pay for itself in just a few months.  The
> > first time I did that calculation, my "power hogs" where given away.
> >
> >
> >
> >
> > On Sun, Aug 19, 2012 at 7:42 AM, Stan, W1LE <stanw1le at verizon.net> wrote:
> >
> >> Hello The Net,
> >>
> >> For your consideration:
> >>
> >> The INTEL model DN2800mt ITX mother board uses a ATOM CPU and
> >> draws about 11 watts of AC power when configured as:
> >> (I have not measured DC power yet.)
> >>
> >> 30 GB OCZ Nocti mSATA solid state drive,
> >> WIN7 pro, 64 bit, USB keyboard and mouse
> >> APEX MI-0008 case.
> >>
> >> Also has:
> >> parallel port available on mother board, you extend to a connector
> >> RS232 serial port available on mother board, you extend to a connector
> >> a single DC power supply from 11 to 19 V DC.
> >> 1 each PCIe expansion port, I will use with a premium 4 channel sound card
> >> SATA ports available for HDD/SDD,
> >> USB ports are available,
> >> Motherboard sound, and Gigalan.
> >>
> >> I have not played with NTP, (yet), but it sounds like a decent time nut
> >> technical challenge.
> >>
> >> My application is for a remote site with only 13V DC power available from
> >> PV/batteries.
> >> Then use fiber ethernet to get off site.
> >>
> >> The INTEL website would have further details.
> >>
> >> Stan, W1LE    Cape Cod   FN41sr
> >>
> >>
> >>
> >>
> >> ZZZZz
> 
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