AGP Always Compensate – BIOS Optimization Guide

AGP Always Compensate - BIOS Optimization Guide

AGP Always Compensate

Common Options : Enabled, Disabled

 

Quick Review

This BIOS feature determines if the AGP controller should be allowed to dynamically adjust the AGP driving strength or use preset drive strength values.

By default, it is set to automatically adjust the AGP drive strength once or at regular intervals. The circuitry can also be disabled or bypassed and a user setting used. However, this BIOS feature does not allow manual configuration.

When you enable AGP Always Compensate, the auto-compensation circuitry will automatically adjust the AGP drive strength at regular intervals.

If you disable it, the circuitry will only adjust the drive strength once at boot-up. The drive strength values derived at boot-up will remain until the system is rebooted.

It is recommended that you enable AGP Always Compensate so that the AGP controller can dynamically adjust the AGP driving strength at regular intervals.

 

Details

This feature is somewhat similar to the AGP Drive Strength feature. It determines if the AGP controller should be allowed to dynamically adjust the AGP driving strength or use preset drive strength values.

Due to the tighter tolerances of the AGP 8X and AGP 4X bus, the AGP controller features auto-compensation circuitry that compensate for the motherboard’s impedance on the AGP bus. It does this by dynamically adjusting the drive strength of the I/O pads over a range of temperature and voltages.

The auto-compensation circuitry has two operating modes. By default, it is set to automatically compensate for the impedance once or at regular intervals by dynamically adjusting the AGP drive strength. The circuitry can also be disabled or bypassed. In this case, it is up to the user (through the BIOS) to write the desired drive strength value to the AGP I/O pads.

This is where AGP Always Compensate differs from the AGP Drive Strength feature. While AGP Drive Strength allows you to switch to manual configuration by the user, AGP Always Compensate does not. It only allows you to change the auto-compensation mode.

When you enable AGP Always Compensate, the auto-compensation circuitry will dynamically compensate for changes in the impendance at regular intervals.

If you disable it, the circuitry will only compensate for the impedance once at boot-up. The drive strength values derived at boot-up will remain until the system is rebooted.

It is recommended that you enable AGP Always Compensate so that the AGP controller can initiate dynamic compensation at regular intervals. This will allow it to compensate for any changes in the impedance.

 

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