Asus A7V400-MX Motherboard DIY Troubleshooting Guide - Page 23

1.9 Switch and jumpers 1. CPU external frequency selection (DSW Switches 1-5) The motherboard frequency is adjusted through the DIP switches. The white block represents the switch position. The illustration below shows the ON and OFF positions of the switches. ON OFF DSW ON 12345 A7V400-MX A7V400-MX DIP Switches The option to set the CPU core bus frequency multiple is available only on unlocked CPUs. If you are using a locked CPU, setting the switches does not produce any effect. The DSW switch tells the clock generator what frequency to send the CPU. This allows the selection of the CPU's external frequency (or bus clock). The bus clock multiplied by the frequency multiple equals the CPU's internal frequency (the advertised CPU speed). The default CPU external frequency is 100MHz. If your CPU supports 200/166/ 133 MHz external frequency, adjust the DSW settings before installing the motherboard to the chassis. ® A7V400-MX DSW ON ON ON ON CPU AGP PCI 12345 12345 12345 200MHz 166.67MHz 133.33MHz 66.67MHz 66.67MHz 66.67MHz 33.33MHz 33.33MHz 33.33MHz 12345 100MHz 66.67MHz 33.33MHz (Default) A7V400-MX CPU External Frequency Selection Set the CPU frequency only to the recommended settings. Frequencies other than the recommended CPU bus frequencies are not guaranteed to be stable. ASUS A7V400-MX motherboard user guide 1-13