An electrical connector includes an insulative housing and two rows of terminals reversely-symmetrically arranged in the insulative housing, each terminal having a contacting portion, a securing portion, and a tail portion, each row of terminals comprising a first and a second grounding terminals and a first and a second power terminals, each row of terminals lacking two terminals to thereby form a first vacant space between the first grounding terminal and the first power terminal and lacking another two terminals to thereby form a second vacant space between the second grounding terminal and the second power terminal. For each row of terminals, the width of the securing portion of each of the first grounding terminal, the second grounding terminal, and the first power terminal is greater than that of each of the remaining terminals. Each row of terminals include a third power terminal disposed in the second vacant space.