Foxconn P35A-S English manual - Page 32

Overclock Options CMOS Setup Utility - Copyright (C) 1985-2005, American Megatrends, Inc. Overclock Options Overclock Options Help Item FOX Ratio Select [Disabled] Select FSB:MEM Ratio CPU FSB Type 800MHz Memory Target Frequency 800MHz CPU FSB Over Clock Choice [ 800] PCIE Freq Over Clock(MHz) [100] Spread Spectrum [Enabled] Memory Remap Feature [Enabled] PCI MMIO Allocation: 4GB to 3072MB DRAM Frequency [Auto] Configure DRAM Timing by SPD [Enabled] Memory Hole [Disabled] 3 Move Enter:Select +/-/:Value F10:Save ESC:Exit F1:General Help F7:Previous Values F8:Fail-Safe Defaults F9:Optimized Defaults Inside Intel chipset, there is a ratio number (we called it FOX Ratio here) which is defined as the value of the memory clock divided by the CPU clock. Normally, multiply CPU clock by 4, you can get the CPU Front Side BUS speed. While for DDR2 memory, multiply memory clock by 2, you can get DDR2 memory speed. In this section, we will explain how to overclock your memory or CPU. CPU FSB Speed 1333MHz 1333MHz 1066MHz 1066MHz 800MHz 800MHz DDR2 Speed 800MHz 667MHz 800MHz 667MHz 800MHz 667MHz CPU Clock 333MHz 333MHz 266MHz 266MHz 200MHz 200MHz Memory Clock 400MHz 333MHz 400MHz 333MHz 400MHz 333MHz FOX Ratio Select 1:1.2 1:1 1:1.5 1:1.25 1:2 1:1.66 The above table lists the Ratio numbers come with different combinations of CPUs and memories. A Normal, Non-overclocking System : We set FOX Ratio to disabled, and DRAM Frequency to Auto. In a CPU FSB 1333MHz system, if a DDR2 800MHz memory is installed, then FOX Ratio number will be set to 1:1.2. Same CPU (FSB 1333MHz), if we install a DDR2 667MHz memory, then FOX Ratio number will be set to 1:1. 25