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Guide: AMD Athlon 64 Motherboard BIOS Settings - CPU and Voltage Settings
Written by danrok   
Friday, 04 February 2005 22:25
Article Index
Guide: AMD Athlon 64 Motherboard BIOS Settings
PC Health Status
Advanced Chipset Features and Memory
CPU and Voltage Settings
All Pages

In this section we'll take a look at CPU settings and voltages. On the 9NDA3+ board these are known as Power BIOS Features because they are core to overclocking the system. These features may appear on different screens depending on the motherboard model.



CPU Settings

The CPU speed is set using a combination of two factors, the CPU clock ratio and the core clock speed.

CPU Speed in MHz

This is the core speed of the CPU, which in this case is 200 MHz at stock speed. The stock speed will vary according to the CPU specifications. Some 32-bit CPU's have a core speed of 166Mhz, for example. Many CPU's are quite capable of running at higher speeds, the upper limit is really a matter of luck of the draw. This setting can be increased in increments of 1 MHz.

CPU Clock Ratio

This number is multiplied by the CPU MHz to give the CPU speed. So, 11x 200 MHz results in a speed of 2200 Mhz. The multipliers available are generally dependant on the CPU specifications and are restricted on some CPU's. This is known as multiplier locking which is carried out by the manufacturer. It is possible to unlock the multipliers on some CPU's.

CPU Voltage

When overclocking it may become necessary to increase the CPU voltage. Great care must be taken to avoid overheating at higher volatages. Good CPU cooling is a must.

DIMM Voltage

Allows adjustment to the RAM voltage. Again care must be taken.

AGP Voltage

Generally, this should match the specified requirement for the installed graphics card.

Chipset Voltage

Can be increased a little to aid with overclocking, but often there is no need. Overheating can become an issue at higher voltages.

AMD K8 Cool 'n' Quiet

When enabled the processor speed and voltage will vary according to load on the CPU. Under small load the CPU will underclock automatically to reduce heat output and power consumption. This feature needs to be disabled when overclocking.

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