Power factor. -----Original Message----- From: Tom Knox <act...@hotmail.com> Sender: time-nuts-boun...@febo.com Date: Sun, 19 Aug 2012 13:19:20 To: Time-Nuts<time-nuts@febo.com> Reply-To: Discussion of precise time and frequency measurement <time-nuts@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_pal...@sasktel.net > To: time-nuts@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 This sounds like a newer version of the board I use.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 <stanw...@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 > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.