Technical Reference Guide: HP Compaq 8100 Elite Series Business Desktop Computers

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 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.
3.3.2 Memory 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.
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]