ASRock P4 Combo User Manual - Page 11

2.1 CPU Sockets This motherboard is equipped with two types of CPU sockets. You may choose to install either Intel 775-Pin CPU or Intel 478-Pin CPU into this motherboard. However, to avoid instability and damage to the system, please do not install both of them into this motherboard. Important: If you install a 775-Pin CPU into this motherboard, it is necessary to adjust the setting of J1--J6, J8--J14, J17, J18, and J21 Jumpers by shorting pin1 and pin2 of all these 16 sets of jumpers. These jumpers are set to support 478-Pin CPU by shorting pin2 and pin3 by default. Please refer to the figure below for these jumpers' location on the motherboard. PGA478 J17 Jumper J17 1111111 J14 J14 Jumper 1111111111 1111111111 1111111111 1111111111 1111111111 J5 J9 J8 J18 1111111111 J21 1111111 1111 J6 J10 J13 J12 J2 1111111111 1111111111 1111111111 J4 J11 1111111111 1111111111 J1 J3 1111111111 1111111111 Jumpers J1, J2, J3 J4, J5, J6 J8, J9, J10 J11, J12 J13, J18 J21 NOTE: For clearer view of Jumpers J1-J6, J8 - J13, J18, and J21, please refer to the magnification on page 9. CPU Type 478-Pin CPU (all 16 Jumpers: short Pin2 and Pin3) (Default) Jumper Settings J1 / J4 / J8 / J11 / J12 / J13 3 2 J2 / J3 / J5 / J6 / J9 / J10 / J14 2_3 (10 x 3-pin) J17 / J18 J21 3 2 (7 x 3-pin) 3 2 (4 x 3-pin) 775-Pin CPU (all 16 Jumpers: short Pin1 and Pin2) 2 1 (10 x 3-pin) (10 x 3-pin) 1_2 2 1 (7 x 3-pin) 2 1 (4 x 3-pin) (10 x 3-pin) 11