Asus A7V400-MX SE A7V400-MX SE user's manual for English version - Page 27

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. A7V400-MX SE ON OFF (Default) O1 2 3 4 5 N 100MHz 66.67MHz 33.33MHz A7V400-MX SE 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 100 MHz. If your CPU supports 200/166/133 MHz external frequency, adjust the DSW settings before installing the motherboard to the chassis. DSW O1 2 3 4 5 O1 2 3 4 5 N N O1 2 3 4 5 N (Default) O1 2 3 4 5 N CPU 200MHz 166.67MHz 133.33MHz 100MHz AGP 66.67MHz 66.67MHz 66.67MHz 66.67MHz PCI 33.33MHz 33.33MHz 33.33MHz 33.33MHz A7V400-MX SE A7V400-MX SE CPU external frequency selection FSB 400 333 266 200 CPU External Frequency 200 MHz 166 MHz 133 MHz 100 MHz 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 SE 1-17