4. BIOS SETUP CPU Bus Frequency (MHz) (when CPU Speed is set to [Manual]; for unlocked processors only) This feature tells the clock generator what frequency to send to the CPU, DRAM, and chipset. The bus frequency (external frequency) multiplied by the bus fre- quency multiple equals the CPU’s core speed. The configuration options vary depending on the CPU (FSB)/PCI Freq. Ratio . CPU Vcore This field displays the core voltage supplied to the CPU. If you want to set it manually, always refer to the CPU documentation. Using Celeron processors Using Pentium III processors Clock Spread Spectrum Options [Enabled] Leave on default setting.
Spread spectrum typically reduces system electro- magnetic interference (EMI) by 8dB to 10dB. Configuration options: [En- abled] [Disabled] [Auto] CPU Level 1 Cache, CPU Level 2 Cache [Enabled] These fields allow you to choose from the default of [Enabled] or choose [Disabled] to turn on or off the CPU’s Level 1 and Level 2 built-in cache. Configuration options: [Disabled] [Enabled] CPU Level 2 Cache ECC Check [Disabled] This function controls the ECC capability in the CPU level 2 cache. Con- figuration options: [Disabled] [Enabled] 4.
BIOS SETUP Advanced Menu Processor Serial Number [Disabled] (When usings Pentium III CPU) The Processor Serial Number is a unique number that is added to every Pentium III processor to help verify the identity of the user across the Internet. Set this field to [Enabled] when you need increased security for doing busi- ness online or e-commerce. Otherwise, leave it to its default setting of [Dis- abled] for greater anonymity when surfing the Internet. BIOS Update [Enabled] This functions as an update loader integrated into the BIOS to supply the processor with the required data. In the default position of [Enabled], the BIOS will load the update on all processors during system bootup.
Configu- ration options: [Disabled] [Enabled] PS/2 Mouse Function Control [Auto] The default of [Auto] allows the system to detect a PS/2 mouse on startup. If detected, IRQ12 will be used for the PS/2 mouse. IRQ12 will be reserved for expansion cards only if a PS/2 mouse is not detected. [Enabled] will always reserve IRQ12, whether on startup a PS/2 mouse is detected or not. Configuration options: [Enabled] [Auto] ASUS CUA User’s Manual 59