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Technical Reference Guide www.hp.com 3-5

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.

NOTE:

[1] Dual-channel symetrical.

HP recommends using symmetrical loading (same-capacity, same-speed modules across both

channels) to achieve optimum 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.

3.3.2 Memory Mapping and Pre-allocation

Figure 3-2 shows the system memory map. The Q67 Express 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 management 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.

Table 3-2.

Memory Socket Loading

Channel B Channel A

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]

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 113 114

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HP LK585LT Ficha de datos Pagina 33