A board-end connector and a wire-end connector capable of being engaged with each other to form a wire-to-board connector assembly are provided. The board-end connector includes a board-end insulating housing, a plurality of board-end terminals, and a plurality of board-end signal terminals. The board-end insulating housing has a board-end power mating section and a board-end signal mating section. The board-end signal mating section is located on one side of the board-end power mating section and has a long signal slot. The plurality of board-end terminals are accommodated in the board-end power mating section. The plurality of board-end signal terminals are accommodated in the long signal slot of the board-end signal mating section.