AGP to DRAM Prefetch – BIOS Optimization Guide

AGP to DRAM Prefetch - BIOS Optimization Guide

AGP to DRAM Prefetch

Common Options : Enabled, Disabled

 

Quick Review

This feature controls the system controller’s AGP prefetch capability.

When enabled, the system controller will prefetch data whenever the AGP graphics card reads from system memory. This speeds up AGP reads as it allows contiguous memory reads by the AGP graphics card to proceed with minimal delay.

It is highly recommended that you enable this feature for better AGP read performance.

 

Details

This feature controls the system controller’s AGP prefetch capability. When enabled, the system controller will prefetch data whenever the AGP graphics card reads from system memory. Here is how it works.

Whenever the system controller reads AGP-requested data from system memory, it also reads the subsequent chunk of data. This is done on the assumption that the AGP graphics card will request for the subsequent chunk of data. When the AGP graphics card actually initiates a read command for that chunk of data, the system controller can immediately send it to the AGP graphics card.

This speeds up AGP memory reads as the AGP graphics card won’t need to wait for the system controller to read from system memory. In other words, AGP to DRAM Prefetch allows contiguous memory reads by the AGP graphics card to proceed with minimal delay.

It is highly recommended that you enable this feature for better AGP read performance. Please note that AGP writes to system memory do not benefit from this feature.

 

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