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A pico BTX is 10.5"x8" and only supports one or two expansions slots, designed for half-height or riser-card applications. A microBTX is 10.4"x10.5" (264x267mm) and it supports up to four expansion slots.
BTX
BTX
On an ATX motherboard, the CPU will be placed above and parallel to the expansion slots, towards the top of the case. On an AT or Baby AT motherboard, the CPU will be placed in front of the expansion slots, towards the front of the case.
ATX motherboards are best suited to providing legacy slots and ports (such as PCI).
BTX
Item. - Mr Sparks
BTX motherboards use a 24-pin power connector.
Pico BTX
How To open .btx file