Sign in with
Sign up | Sign in
Your question

Looking for an external power supply for mini itx, HTPC External Power

Last response: in Systems
October 25, 2009 10:44:37 AM

Im trying to find ( and failing epicly ) an external power supply unit for my htpc build, my build specifications are listed below. I do not have my motherboard or tv tunner yet as the motherboard will be released in Mid November. I need to find an external psu something like the picture posted which is a PicoPSU-150-XT ( which is a 150 watt psu ) but I want to make sure that 150 will be enough for my application, All the 200 watt internal connectors are too big for my case so if I need more than 150 watt I will have to get an internal psu. UNLESS someone knows of some that looks like the picture only in a 200 watt. Really I even wonder if I could just get away with using the picopsu-150 watt power adater, as I have no clue as to what the wattage usages are between my components or how many watts an atom n330 motherboard even uses.


Operating System - WINDOWS 7 Ultimate
Case - Lian Li PC-Q07 Mini-ITX Case
HDD - Western Digital WD500AAKS ( 500GB x 1 )
Ram - Corsair 800mhz CM2X1024-6400C4 ( 2GB x 2 )
Optical Drive - 5.25 Full Size HD-DVD / BLU-RAY Drive ( Sata connected )
TV Tunner - Hauppauge WinTV-HVR-2250 Dual TV Tuner ( PCI-Express x1 )
Motherboard - ZOTAC IONITX-G-E ( 1.6 GHZ Dual Core Atom N330 )

Motherboard specs can be found at the link below :

PicoPSU specs can be found at the following link :;jsessionid=0a01054f1f4313c46685bfcd490398108593d8dfd065.e3eTaxiNaN0Te34Pa38Ta38Qahf0

There is an internal psu extender mount available for my case at the link below:
October 25, 2009 1:43:22 PM

Actually theres a problem with your build. The Zotac Ion boards do not come with a true pci-x slot. Its actually a mini pci-x slot for a network card. Most zotac HTPC builds need to use a USB type tuner or a network based on like the Homerun and Hava. You can actually get the zotac board with an external 90w PS which is plenty for what your looking for here You can get a PCI slot with the ASUS ion board though which is also available A 150 watt power supply is plenty for this setup also.
October 25, 2009 5:09:39 PM

That would be true if you didnt look at the board inforfmation at the link i posted, the board I choose has BOTH, a mini pci meant for wifi, AND a regular PCI-E x 1
Related resources
October 26, 2009 2:04:04 PM

Well your link was bad....and I missed it when i searched for it so was wrong there. Either way 150 watts should be more than enough.
a b ) Power supply
a b V Motherboard
December 31, 2009 7:24:12 AM


I have a mini-PC that has Atom 230 prosessor/Intel GMA 950 integrated graphic/1 Gt memory/160 Gt 3,5" hd/DVD-RW drive/Win XP Home.

The power supply is only 65 watts (external). I installed ATI Radeon 4350 videocard for the pic-e x1 slot. The specs say that the HD4350 takes only 20w at max. I tested with my electric power meter and my mini-pc used only 30 w on the desktop view. Now I have the HD 4350 videocard installed and the pc still works (unluckily my electric power meter doesn't work any more so I cannot say how much my mini-PC is taking energy now) so it'll probably take about 50 watts of power (I guess the power supply's (65w) energy efficently is about 80% of the 65w so it'll be 0,8x65=52w).

On the board I have one pci-e x1 slot where was a wlan card. I replaced it with the HD4350 videocard. Though I had to cut the slots back away so I could install the pci-e x16 card. I tested with 3dMark2001SE. With the integrated Intel GMA950 the score was about 2350 points -> using the HD4350 the score increased to 6990 points!

I don't know how much Atom 330 Dual core will need power, but if I manage well with my 65w power supply and I have add-on videocard, I think that you can manage also with 120w to 150w power supply.