Yeah, the Z4 has standard AT power connectors. I recommend finding an AT power supply, as you won't have to deal with the "always kinda on" issue with an ATX supply w/ AT converter
My Z4 bus is currently at the bottom of a box in my closet. I could never get it to work properly with my Blizzard1260, though the XSurf cleaning technique may help. Strange that the XSurf works in my Micronik bus without problems...