Integrated Graphics Subsystem

The total memory allocation is determined by the amount of system memory installed in a system, along with the BIOS settings, operating system, and system load. Table 6-1 shows the pre-allocation memory amounts.

Table 6-1.

Integrated Graphics ControllerMemory Allocation with Windows XP

System Memory Installed

Pre-allocated

DVMT

0.5 GB

32 MB

128 MB

1.0 GB

32 MB

512 MB

1.5 GB

32 MB

768 MB

> 2GB

32 MB

1024 MB

System memory that has been pre-allocated is not seen by the operating system, which will report the total amount of memory installed less the amount of pre-allocated memory.

Systems running Windows Vista or Windows 7 use Protected Audio Video Path (PAVP) to ensure smooth playback of high-definition video by off-loading video decoding from the processor to the integrated graphics controller. BIOS can allocate addtional memory for PAVP, which can be set through RBSU to run in Lite mode (default) or in Heavy mode. Table 6-2 shows the PAVP memory usage for Windows Vista and Windows 7.

Table 6-2.

Integrated Graphics Controller

Memory Allocation with Windows Vista or Windows 7

 

 

 

 

 

 

 

Available

Total

Shared

System Memory

PAVP

System

Available

System

Installed

Setting

Memory

Graphics Memory [1]

Memory [2]

 

 

 

 

 

1 GB

Lite

952 MB

252 MB

124 MB

 

Heavy

856 MB

294 MB

166 MB

2 GB

Lite

1976 MB

764 MB

636 MB

 

Heavy

1880 MB

806 MB

678 MB

4 GB

Lite

4024 MB

1759 MB

1631 MB

 

Heavy

3928 MB

1759 MB

1631 MB

6 GB

Lite

6072 MB

1759 MB

1631 MB

 

Heavy

5976 MB

1759 MB

1631 MB

8 GB

Lite

8120 MB

1759 MB

1631 MB

 

Heavy

8024 MB

1759 MB

1631 MB

NOTES:

Dedicated Video Memory (memory owned and locked for graphics use and reported by the OS): PAVP Lite setting = 32 MB

PAVP Heavy setting = 122 MB

System Video Memory (memory locked and dedicated for gtraphics use): PAVP Lite setting = 96 MB

PAVP Heavy setting = 6 MB

[1]Total amount of memory available for graphics as reported by the OS.

[2]Shared System Memory (memory dynamically allocated for graphics use).

 

Technical Reference Guide

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6-3