ASROCK 4CORE1600TWINS-P35 Installation Manual page 21

FSB1 Jumper
(FSB1, 3-pin jumper, see p.2 No. 31)
FSB2 Jumper
(FSB2, 5-pin jumper, see p.2 No. 32)
FSB3 Jumper
(FSB3, 5-pin jumper, see p.2 No. 32)
Note1: If you use a FSB1600-CPU on this motherboard, you need to adjust the jumpers.
Please short pin4, pin5 for FSB3. Otherwise, the CPU may not work properly on
this motherboard. Please refer to below jumper settings.
Note2: If you use a FSB1333-CPU and adopt a DDR2 1066 memory module on this
motherboard, you need to adjust the jumpers. Please short pin4, pin5 for
FSB2. Otherwise, the CPU and memory module may not work properly on
this motherboard. Please refer to below jumper settings.
Note3: If you use a FSB1066-CPU and adopt a DDR2 1066 memory module on this
motherboard, you need to adjust the jumpers. Please short pin2, pin3 for
FSB3. Otherwise, the CPU and memory module may not work properly on
this motherboard. Please refer to below jumper settings.
ASRock 4Core1600Twins-P35 Motherboard
Default
FSB1600
FSB1333 / DDR2 1066
FSB1066 / DDR2 1066
2 1 2 1 2 1
2 1 2 1