Motherboard and expansion board for providing such motherboard with slots

A motherboard assembly selectively complying with one of a FlexATX specification, a MicroATX specification and an ATX specification, said motherboard assembly comprising:

• a motherboard having the FlexATX specification;
• a first expansion board, detachably connected to said motherboard, and having at least one first slot, wherein when said first expansion board is connected to said motherboard, said motherboard assembly has the MicroATX specification;
• and
• a second expansion board, detachably connected to said first expansion board, for providing at least one second slot, wherein when said second expansion board is connected to said first expansion board and said first expansion board is connected to said motherboard at the same time, said motherboard, said first expansion board and said second expansion board are arranged in a coplanar fashion, and said motherboard assembly has the ATX specification,
• wherein said motherboard, at a first edge thereof, is provided with a first connection device, and said first expansion board, at a second edge thereof, is provided with a second connection device for making connection thereof to the first connection device, and wherein said first expansion board, at a third edge thereof, is provided with a third connection device on the third edge thereof, and said second expansion board, at a fourth edge thereof, is provided with a fourth connection device for making connection thereof to the third connection device.