An electrical connector assembly (100) comprises an insulative housing (1), a plurality terminals (100) received therein, a chip module (2) attached on the housing (1), an cover (4) mounted on the chip module (2) and a printed circuit (3) mounted below the housing (1), a heat cooling device (5) assembled through the cover (3), the chip module (2) and the housing (1), and the printed circuit board (4) for transmitting airflow into a interface formed between the housing (1) and the printed circuit board (3).