Southbridge-free mainboard

The invention discloses a southbridge-free mainboard. The mainboard comprises a central processor, an Intel-integrated circuit (I2C) bus, an embedded control chip, a power supply control chip, a peripheral component interconnect (PCI) bus and PCI equipment, wherein the central processor is connected with an input end of the embedded control chip through the I2C bus, an output end of the embedded control chip is connected with the power supply control chip, and the central processor is connected with the PCI equipment through the PCI bus. The mainboard is used for solving the problems of higher cost of the existing mainboard and lack of flexibility in circuit design.