Re: Estimating System wattage

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Rich Emberson wrote:
So, I recently built a new system. I figured out what
motherboard I wanted, what cpu, how much memory and
disk and then I when and used a couple of the online
system wattage calculators and got somewhere between
500 to 650 watts. I could not get (find) a PSU
with the right connectors for the motherboard so
I ended up getting Silverstone Zeus 750 watt supply
(yea, overkill). I then got a UPS from a local store.
They had a sale and a higher end UPS turned out to
be cheaper than a 600 watt unit, so I got a
APC UPS BX1500LCD (865 watt) (again, overkill but nice).
What is interesting about this UPS is that it can
show the current wattage used by your system on its
LED (along with other stuff).
Now, my strategy for constructing the new system was to pick
a motherboard that was build for high-end power and then
pick cool components; I am a developer, not a game player
and this system will house MythTV and Asterisk someday,
well as serve as a development box.
So, what I ended up with was:

    ASUS P5Q Deluxe
    Intel quad core QX9550
        95 watts max for $550
        (the QX9650 is 130 watts at $1000)
    8GB CORSAIR (DOMINATOR) TWIN2X4096-8500C5DF
    Asus EN7300GT silent graphics board
        idle: 8.7 Watts
        max: 16.1 Watts
    2 WD VelociRaptor Model: WD3000GLFS 300
        Read/Write  6.08 Watts
        Idle        4.53 Watts
        Standby     0.42 Watts
        Sleep       0.42 Watts
    2 WD Caviar GP Model: WD10EACS 1 TB
        Read/Write  7.50 Watts
        Idle        4.0 Watts
        Standby     0.97 Watts
        Sleep       0.97 Watts
    ASUS V60 cpu cooler (overkill)
    SAMSUNG  SH-S203N DVD/CD RW
    Logitech SBF-90 Black 3 Buttons 1 x Wheel
    Logitech 967738-0403 Black 104 Normal Keys
    SST-ST75ZF Zeus power supply (overkill)
    APC UPS BX1500LCD (overkill, but very nice)
    Lian Li PC-A71 Black (overkill, but very, very nice)
    BIOS 0803
    Fedora 9 64

Now, with no applications running, idle, according to the UPS
the system uses 70 watts.
The highest wattage I can get it to use running bunches of
parallel compiles is about 125 watts.

My question is: whats with the online wattage estimators?
Are they all implemented by folks selling power supplies
who want to sell users bigger ones than are needed?

In terms of power needs, I ended up way over-specing $$ the system.
Basically, I ended up with a system that
uses as much power as a 120 watt light bulb.

Richard


Watts are simple, you just add them up. When I add up yours, I get 114.5 max load for the items you listed. I would guess then that the 125 watts you are seeing is probably pretty close. The power supply you bought is probably bigger than you need but the UPS, if you want to run on the battery more than a couple of minutes, is probably undersized.

If I were going to build a computer, I would probably size my power supply for twice the expected load plus a little to account for things I don't think of. Now it is possible to put a lot of load on USB ports with external drives or other equipment so you would want to allow some more for that.

--

Knute Johnson
linux@xxxxxxxxxxxxxxxxxxxx

--
fedora-list mailing list
fedora-list@xxxxxxxxxx
To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list
[Index of Archives]     [Older Fedora Users]     [Fedora Announce]     [Fedora Package Announce]     [EPEL Announce]     [Fedora Magazine]     [Fedora News]     [Fedora Summer Coding]     [Fedora Laptop]     [Fedora Cloud]     [Fedora Advisory Board]     [Fedora Education]     [Fedora Security]     [Fedora Scitech]     [Fedora Robotics]     [Fedora Maintainers]     [Fedora Infrastructure]     [Fedora Websites]     [Anaconda Devel]     [Fedora Devel Java]     [Fedora Legacy]     [Fedora Desktop]     [Fedora Fonts]     [ATA RAID]     [Fedora Marketing]     [Fedora Management Tools]     [Fedora Mentors]     [SSH]     [Fedora Package Review]     [Fedora R Devel]     [Fedora PHP Devel]     [Kickstart]     [Fedora Music]     [Fedora Packaging]     [Centos]     [Fedora SELinux]     [Fedora Legal]     [Fedora Kernel]     [Fedora OCaml]     [Coolkey]     [Virtualization Tools]     [ET Management Tools]     [Yum Users]     [Tux]     [Yosemite News]     [Gnome Users]     [KDE Users]     [Fedora Art]     [Fedora Docs]     [Asterisk PBX]     [Fedora Sparc]     [Fedora Universal Network Connector]     [Libvirt Users]     [Fedora ARM]

  Powered by Linux