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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]