Processor/Memory Subsystem

3.3.1 Memory Upgrading

Table 3-2 shows suggested memory configurations for these systems.

Table 3-2 does not list all possible configurations.

Table 3-2.

Memory Socket Loading

 

 

 

 

Channel A

Channel B

 

 

Socket 1

Socket 2

Socket 3

Socket 4

 

Total

 

 

 

 

 

 

1 GB

none

none

none

1

GB

1 GB

none

1 GB

none

2

GB [1]

1 GB

1 GB

1 GB

1 GB

4 GB [1]

2 GB

2 GB

2 GB

2 GB

8 GB [1]

4 GB

4 GB

4 GB

4 GB

16 GB [1]

NOTE:

[1] Dual-channel symetrical.

HP recommends using symmetrical loading (same-capacity, same-speed modules across both channels) to achieve the best performance.

CAUTION: Always power down the system and disconnect the power cord from the AC outlet before adding or replacing memory modules. Changing memory modules while the unit is plugged into an active AC outlet could result in equipment damage.

Memory amounts over 3 GB may not be fully accessible with 32-bit operating systems due to system resource requirements. Addressing memory above 4 GB requires a 64-bit operating system.

3.3.2Memory Mapping and Pre-allocation

Figure 3-2 shows the system memory map. The Q57 PCH-D0 includes a Management Engine that pre-allocates a portion of system memory (16 MB for one module, 32 MB for two modules) for managment functions. In addition, the internal graphics controller pre-allocates a portion of system memory for video use (refer to chapter 6). Pre-allocated memory is not available to the operating system. The amount of system memory reported by the OS will be the total amount installed less the pre-allocated amount.

 

Technical Reference Guide

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3-5

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HP 8100 manual Memory Upgrading, Memory Mapping and Pre-allocation, Memory Socket Loading, Channel a Channel B Socket Total

8100 specifications

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