10 External USB: 6 x 3.0 (2 front/4 rear) and 4 x 2.0 (2 front/2 rear – 1 front with PowerShare); 1 Internal USB 2.0; 1 RJ-45; 1 Serial; 2 Display Port 1.2; 1 HDMI 1.4; 2 PS/2; 1 UAJ, 1 Line-out;