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Old December 5, 2008, 10:15 AM
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Location: Montreal, QC
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Default help me figure the minimal wattage of my mini-itx machine

Here's what i have in it:
windsor athlon x2 3800+
j&w 780G mini-itx
a HD2400 pro in hybrid crossfire
2 sodimm
one 120mm fan
1 slim optical drive, would like to upgrade to blu-ray reader later on
1 3.5" hdd, would like to add another 2.5" hdd later on

I tested with killawatt on a corsair 400 psu and with everything except the extra 2.5" hdd and the optical drive, and the peek usage was at about 130W. I wasn't running orthos, wasn't undervolted either, but i was running a game. PSU calculator told me i needed a bit more than 150W. I can only fit a 150W psu in the case. I was thinking of getting this psu kit. I heard someone on the board say that it had a weak 12V line. I don't know which component uses 12V in my setup so i don't know if it's enough or not. Here are the specs:
Code:
Maximum Output      152.2W
Output Voltage (V)     5VSB     +3.3        +5        +12     -12
Output Current (A)     2.0        10.0       12.0      4.0      0.1
Output Power (W)      10          33         60         48       1.2
Peak Current (A)       2.0         10.0      12.0      4.0       0.1
If i have to, i'm willing to drop the extra hdd and the optical drive.

Last edited by baov; December 5, 2008 at 10:24 AM.
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Old December 5, 2008, 10:28 AM
burebista's Avatar
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Quote:
Originally Posted by baov View Post
I don't know which component uses 12V in my setup so i don't know if it's enough or not.
Almost everything.
You can't power your system with 4A on +12V.
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Old December 5, 2008, 10:30 AM
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Then what system would power on it? What must i remove from my setup?
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Old December 5, 2008, 10:55 AM
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Guesstimate values.

CPU ~ 4-5A
MB ~3-4A
GPU ~2A
RAM ~0.5A
FAN 0.2A
Optical ~0.5A idle
HDD ~0.5A idle 1A seek
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Old December 5, 2008, 11:09 AM
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From what you tell me, no computers out there could possibly turn on with this PSU. I wonder why they would make it then!
Well, thanks for the help. Guess i'll have to look for another PSU. Will be hard to find one unless i go into the automotive PSUs, then i'd still have to buy an external AC/DC converter.

Last edited by baov; December 5, 2008 at 12:22 PM.
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Old September 30, 2009, 02:13 PM
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These PSs are for things like running a uITX board as a DIY home router; it would draw about 50W. Here is another option you can look at. Be careful with these as a lot of them pass the 12V directly through from the power brick; the the brick is poor quality it can wreck you gear.

Check out mini-itx.com. There are lots of people using these kinds of PSs in home theatre rigs so I am sure someone can point you to the right product.
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