Processor/Memory Subsystem

3.3.1 Memory Upgrading

Table 3-2 shows suggested memory configurations for these systems. Note that the USDT form factor provides only two memory sockets.

Table 3-2 does not list all possible configurations.

Table 3-2.

Memory Socket Loading [1]

 

 

 

Channel A

Channel B

 

Socket 1

Socket 2 [2]

Socket 3

Socket 4 [2]

Total

 

 

 

 

 

512 MB

none

none

none

512-MB

512 MB

none

512 MB

none

1-GB [3]

1-GB

none

none

none

1-GB

1 GB

none

1 GB

none

2 GB [3]

1 GB

1 GB

1 GB

1 GB

4-GB [3]

2 GB

none

2 GB

none

4-GB [3]

4 GB

4 GB

4 GB

4 GB

16-GB [3, 4]

NOTE:

[1]USDT form factor uses SODIMM sockets. SFF and CMT form factors use DIMM sockets.

[2]Not present on USDT form factor.

[3]Dual-channel symetrical

[4]Only SFF and CMT support this size memory

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 Q45 Express chipset 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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HP dc7900 manual Memory Upgrading, Memory Mapping and Pre-allocation, Memory Socket Loading

dc7900 specifications

The HP dc7900 is a well-regarded desktop solution that serves as a testament to HP's commitment to performance, reliability, and user accessibility. Introduced as part of HP’s Compaq line and designed primarily for business professionals, the dc7900 combines powerful processing capabilities with a compact form factor that suits various office environments.

One of the standout features of the HP dc7900 is its robust configuration options. It typically comes equipped with Intel's Core 2 Duo or Quad processors, giving users the ability to handle demanding applications seamlessly. The inclusion of Intel's technologies, such as Intel vPro, enhances remote management and IT control, making it an ideal choice for businesses looking to streamline their operations.

The dc7900 is designed with flexibility in mind. It offers multiple form factors, including mini-tower, small form factor, and ultra-slim desktop configurations. This variety enables organizations to choose a model that best fits their workspace requirements, maximizing both efficiency and aesthetics. The small footprint models are particularly beneficial in space-constrained environments, while the mini-tower version provides expandability for future upgrades.

In terms of graphics capabilities, the HP dc7900 typically features integrated Intel graphics, with options to install discrete graphics cards for users who require enhanced visual performance. This makes the dc7900 suitable for tasks ranging from standard office applications to more graphics-intensive responsibilities.

Connectivity is another key characteristic of the HP dc7900. It is equipped with a variety of ports, including USB 2.0 and audio jacks, allowing users to connect peripherals easily. Additionally, the dc7900 supports legacy connections, making it easier for businesses with older equipment to integrate new systems without hassle.

Durability and reliability are hallmarks of the HP dc7900. Built with high-quality materials and subjected to rigorous testing, this desktop is designed to withstand the demands of a bustling office environment. Furthermore, HP's comprehensive warranty and support options assure businesses of the reliability of their investment.

The HP dc7900 is not just a powerful desktop; it’s a versatile and dependable solution for modern businesses. With its combination of performance, expandability, and solid build quality, the dc7900 remains a relevant choice for those looking to enhance their productivity and efficiency in the workplace.