I ATX-ed my first Gigabit Ethernet. But the PSU in the MDD is different. It's a slim style (like those found in rack units). It's possible to hang a ATX PSU in a MDD but it looks pretty bad. I'd rather hold out for a replacement PSU. I wondered about taking the guts of a working rack unit PSU and transplanting them into the MDD's PSU casing. But never found a suitable donor PSU.