[time-nuts] Modern motherboard with RS232 port
Tom Knox
actast at hotmail.com
Sun Aug 19 19:19:20 UTC 2012
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 This sounds like a newer version of the board I use.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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