[CentOS] Off-Topic: Low Power Hardware

Mon Jan 14 18:17:38 UTC 2013
Christian Pfarr <webmaster at itnoobz.org>

Maybe you have a look on my Serversystem, described on my Homepage http://itnoobz.org/?page=Server. Unfortunately in German :(
It only consumes 28 W under high load.
Works perfectly till 6 Months.

 Intel® D2500CCE inkl. Intel® Atom D2500
2x Kingston ValueRAM SO-DIMM 2 GB DDR3-1066
2x Western Digital WD20EURS 2 TB
be quiet! Pure Power L7 300W

Further Questions?

Am 14.01.2013 um 18:47 schrieb SilverTip257 <silvertip257 at gmail.com>:

> On Mon, Jan 14, 2013 at 11:20 AM, Matt Garman <matthew.garman at gmail.com>wrote:
>> On Fri, Jan 11, 2013 at 8:55 AM, SilverTip257 <silvertip257 at gmail.com>
>> wrote:
>>> I'm in search of some hardware that consumes a low amount of power for
>> use
>>> as a test-bed for Linux, various coding projects, and LAN services.
>>> 1) Low power consumption (10-15W ... maybe 30W at most)
>>> 2) Must run Linux without too much fuss (CentOS or otherwise)
>>> 3) Must have two NICs (fast ethernet or better)
>>> 4) Memory - 1GB or better
>>> 5) Can be configurable either via serial or VGA.
>>> 6) Accepts a normal hard drive, not CF -- drive capacity is my concern.
>>> 7) spare PCI slot is a _plus_ (extra NICs or whatever else)
>>> 8) I'd like to keep the physical footprint to a minimum (size of a 1U
>>> switch or so?)
>> The lowest-power x86 device I've used is an Alix 2d2 from PCEngines.
>> Power consumption was about five watts, regardless of load.  This has
>> three 100 mbps NICs, a 32-bit x86 AMD Geode CPU, and 256 MB RAM
>> soldered to the board.  Has a built-in Compact Flash slot to use as a
>> "hard drive".  I ran OpenBSD on mine for years as a
>> firewall/gateway/router for a home LAN (don't see why it wouldn't run
>> CentOS).  (I'm actually selling mine, email off list if interested.)
> The Geode CPUs do not support PAE [0].  While CentOS 5.x would work, 6.x
> requires a kernel recompile (not complaining, but noting).
> [0] http://joseph.freivald.com/linux/2010/04/22/alix-centos-image/
>> I upgraded my firewall device to an Atom-based D2500CCE.  IIRC, I
>> installed 2x2GB of RAM, booting from a cheap SSD, powered by a
>> PicoPSU, and running PFSense.  I think this configuration pulls
>> roughly 16 watts at idle, maybe a couple more watts when fully loaded.
>> This board has dual Intel gigabit ethernet ports.
>> For my home theater PC, I'm running an ASRock H67M-ITX and Core
>> i3-2100 CPU, with 2x4GB of RAM and SSD.  I have it inside a Habey
>> EMC-800B case, using the included power supply.  Idle power
>> consumption is about 22 watts.  It's been a while since I measured
>> power consumption at load, but I'd guess 50--60 watts (it's idle 99%
>> of the time though).  Note that even when "idle", MythTV seems to use
>> a little CPU, so if I kill mythfrontend, my idle power consumption
>> drops another watt or two.
>> Only one NIC on the Asrock board, but it has a PCIe expansion slot so
>> you could easily add another.  I'd expect an add-on NIC to add around
>> one to five watts of power consumption.
>> My personal workstation uses an Intel DH67GD micro-ATX motherboard,
>> i5-2500k CPU, 4x4GB RAM, SSD, and traditional ATX power supply
>> (Seasonic SS-300ET).  It pulls about 30 watts when idle.  Only one NIC
>> on that motherboard.
>> For all the above, I'm talking AC (i.e. at the wall) power
>> consumption, in the USA (so 115 Volts), measured with a Kill-A-Watt
>> (not high-precision, but should be reasonable within a watt or two).
>> What follows is stuff with which I have no personal experience, but
>> have read about:
>> The Intel S1200KP mini-itx motherboard.  It has built-in dual gigabit
>> NICs, socket 1155, so you can use anything from a Celeron up to a
>> Xeon, depending on how much you want to spend and what your
>> upper-bound computational needs are.  I was considering that for my
>> firewall/router replacement.  With a PicoPSU I would suspect that one
>> could get 20 watts or lower idle power consumption.
>> With an Intel DQ77KB motherboard, and Pentium G2120, SilentPCReview
>> built a system that pulls 16.5 Watts[1].  (The article is a case
>> review, but power consumption information is included.)  That DQ77KB
>> board also has dual gigabit NICs.
>> You might also be interested in Intel's "NUC - Next Unit of
>> Computing"[2].  About 10 watts power consumption for dramatically
>> under-clocked i3 CPU.
>> In general, with modern Sandy/Ivy Bridge CPUs, it's almost trivial to
>> build a high-performing system that has 30 watt or less idle power
>> consumption.  If you cherry-pick components, it's not terribly hard to
>> get a system with 20 watt idle power draw.  The modern Intel CPUs all
>> have roughly the same idle power usage (at least the consumer line,
>> not sure about Xeons).  That goes for the more expensive low-power
>> variants as well.  The difference of the low-power variants is their
>> upper-bound power consumption is lower than their peers.  But you can
>> often fake that by deliberately limiting the max frequency in the
>> BIOS.  Of course, with these "real" CPUs (compared to e.g. Atom),
>> power consumption will be much higher when loaded.  But from what I've
>> read, the "real" CPUs are actually better in the long run, because
>> their computation efficiency is so much higher.  With something like
>> Atom, you get more deterministic power draw, but a severely
>> compromised upper-bound on computational power.  In your requirements,
>> you mentioned "various coding projects".  If you are working in a
>> compiled language (e.g. C, C++, Java), for substantially large
>> projects, your compile times will be painful on Atom, but pleasantly
>> fast on a Sandy/Ivy Bridge CPU.
> I'll have to keep the 'real' cpu point in mind because after all this box
> will be idle much of the time.
>> [1] http://www.silentpcreview.com/Akasa_Euler_Fanless_Thin_ITX_Case
>> [2] http://www.silentpcreview.com/Intel_NUC_DC3217BY
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> Thanks!
> -- 
> ---~~.~~---
> Mike
> //  SilverTip257  //
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