An electrical connector (1) mounted to a PCB (3) comprises a bottom housing (4), an upper housing (5) assembled to the bottom housing, a cable (2), a plurality of signal terminals (6) and grounding terminals (7, 8) therein. The bottom housing has a first groove (42) and a plurality of recesses (402). The upper housing has a second groove (52) and a plurality of depressing blocks (500) being respectively aligned with the first groove and the recesses. The cable extends through a cable-receiving groove defined by the first groove and the second groove and has a plurality of wires (20) extended into corresponding recesses at which the depressing blocks apply pressure to the wires for securing the wires in corresponding recesses. Each signal terminal comprises a retention portion (64) disposed in a corresponding recess of the bottom housing and electrically engaging a corresponding wire by insulation displacement connection (IDC), and a tail portion (62) surface mounted to the PCB.