sentences:  Some proprietary COM formats have modified SODIMM and MXM edge-connector style designs, while others have arbitrary rectangular dimensions along with various types of high density board-to-board connectors
  .Notably, the Raspberry Pi Compute Module is designed in a 200-pin SODIMM format.Using a carrier board is a benefit in many cases, as it can implement special I/O interfaces, memory devices, connectors or form factors.