Build A PC
A custom PC configuration guide.
© 2000,2001,2002 by Jef Poskanzer.
Motherboard Form Factors
Motherboards come in a few different physical sizes.
This isn't a real big issue - just check the form factor on the
motherboard you select, and choose a case that fits it.
12" x 13.8".
Based on the original IBM PC-AT's board.
Baby AT, a smaller version of the AT board.
305 x 244 mm.
Stands for AT-extended - an enhanced version of the AT board.
This is the most common form in use today.
244 x 244 mm.
A smaller version of ATX.
There are some nice small micro-tower cases that take microATX motherboards.
If physical size is an issue, look at these.
- Flex ATX
229 x 191 mm.
Even smaller than microATX.
170 x 170 mm.
Even smaller than Flex-ATX!
These boards are tiny.
Lots of info
A workstation/server version of ATX, with some more room.
Not common, yet.
Back to ACME Labs.