A motherboard for a computer box having internal circuitry and communication ports comprises a portable motherboard having a connector for connection to an externally accessible connector of said computer box; wherein, connection of said portable motherboard connector to said externally accessible computer box connector enables said computer box to perform computing operations. The inventive motherboard is portably configured to serve one or more computers, preferably a personal computer or laptop. The portable motherboard provides a computer box with a brain. Alternatively, where a computer with a brain is slow, the portable motherboard may be used to boost the brainpower of the slow computer. Whether the portable motherboard brings life to a computer box or boosts the microprocessor power of a computer containing an internal microprocessor, the portable motherboard is a powerful invention that makes microprocessor power more efficient and ubiquitous.