Pico Micro

How can you tell whether a system was Regular BTX, OR Micro BTX, OR Pico BTX?

You can tell by looking at the number of expansion slots on the board. Follow this chart:

BTX: maximum width 325.12 mm, up to 7 add-in card slots.

microBTX: maximum width 264.16 mm, up to 4 add-in card slots.

picoBTX: maximum width 203.20 mm, up to 1 add-in card slot.

Optoma to demo micro-portable Pico handheld projector