Shuttle XPC SB75G2 + Opus 150w PSU

[robutek]

I am trying to setup a realiable "carputer/car pc" with my current desktop system which is the Shuttle XPC SB75G2. The current PSU that it comes with is a 220W PSU. And the question I have is, will an OPUS 150W DC-DC PSU be enough to power up my system with the current specs:

Shuttle XPC SB75G2
P4 2.6 Ghz 800 Mhz FSB
Mushkin 512MB DDR400
Western Digital 40GB 7200 RPM
Geforce MX2 32MB PCI Video Card
Samsung 16x DVD-Drive

I would appretiate any help or details on how many watts the motherboard alone consumes and also the CPU. Thanks.

[Stu]

At I guess I would say the p4 chip alone is pulling ~70W, then another ~30W for your mobo. With psu's, its not really the quantity (wattage), more the quality of the psu itself.

My QuietPC 300W'er, happily kept a 400W+ system rock steady.