ASRock K8 Combo-Z User Manual - Page 12

2.1 CPU Sockets This motherboard is equipped with two types of CPU sockets. You may choose to install either 939-Pin CPU (AMD Athlon 64FX) or 754-Pin CPU (AMD Athlon 64) 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 939-Pin CPU into this motherboard, it is necessary to adjust the setting of J1 / J2 / J3 / J4 / J5 / J6 / J7 Jumpers by shorting pin2 and pin3 of all these seven sets of jumpers. These jumpers are set to support 754-Pin CPU by shorting pin1 and pin2 by default. Please refer to the figure below for these jumpers' location on the motherboard. Socket 754 SOCKET 939 1 J5 1 J6 J5 / J6 Jumpers J7 1 J7 Jumper J1 1 1 1 1 1 1 1 1 1 1 J2 1 1 1 1 1 1 1 1 1 1 J3 1 1 1 1 1 1 1 1 1 1 J4 1 1 1 1 1 1 1 1 1 1 J1 - J4 Jumpers CPU Type 939-Pin CPU (all 7 Jumpers: short Pin2 and Pin3) Jumper Settings J1/J2/J3/J4 J5/J6 J7 2_3 2_3 2_3 (2 x 3-Pin) (1 x 3-Pin) 754-Pin CPU (all 7 Jumpers: short Pin1 and Pin2) (Default) (10 x 3-Pin) 1_2 1_2 1_2 (2 x 3-Pin) (1 x 3-Pin) (10 x 3-Pin) 12