I have an Insight P4 mini-ITX board (w/ P4 Celeron 2.4Ghz) and it runs fine off my Arise MPD-810H PSU. The Arise unit provides [email protected] and [email protected] With such large amounts of current on the 5V rail you will have no problems running a bunch of laptop hard drives and usb devices. I ran the celeron, mobo, 3.5 hard drive, and 3.5 cdrom drive all off the 12V rail with no problems (while encoding a divx movie). It regulates 10-30V. Depending on your car's electrical system, it might survive crank.