Memory Subsystem | HP dc7900 guide

Processor/Memory Subsystem

3.3Memory Subsystem

All models support non-ECC PC2-5300 and PC2-6400 DDR2 memory. The USDT form factor supports up to eight gigabytes of memory while the SFF and CMT form factors support up to 16 gigabytes of memory.

✎The DDR SDRAM “PCxxxx” reference designates bus bandwidth (i.e., a PC2-5300 module can, operating at a 667-MHz effective speed, provide a throughput of 5300 MBps (8 bytes × 667MHz)). Memory speed types may be mixed within a system, although the system BIOS will set the memory controller to work at speed of the slowest memory module.

The USDT system board provides two SODIMM sockets and the SFF and CMT system boards provide four DIMM sockets

■XMM1, channel A (black)

■XMM2, channel A (white, not present in USDT form factor)

■XMM3, channel B (white)

■XMM4, channel B (white, not present in USDT form factor)

Memory modules do not need to be installed in pairs although installation of pairs (especially matched sets) provides the best performance. The XMM1 socket must be populated for proper support of Intel Active Management Technology (AMT). The BIOS will detect the module population and set the system accordingly as follows:

■Single-channel mode - memory installed for one channel only

■Dual-channel asymetric mode - memory installed for both channels but of unequal channel capacities.

■Dual-channel interleaved mode (recommended) - memory installed for both channels and offering equal channel capacities, proving the highest performance.

These systems support memory modules with the following parameters:

■Unbuffered, compatible with SPD rev. 1.0

■512-Mb, and 1-Gb memory technologies for x8 and x16 devices

■CAS latency (CL) of 5 or 6 (depending on memory speed)

■Single or double-sided

■Non-ECC memory only

The SPD format supported by these systems complies with the JEDEC specification for 128-byte EEPROMs. This system also provides support for 256-byte EEPROMs to include additional HP-added features such as part number and serial number.

If BIOS detects an unsupported memory module, a “memory incompatible” message will be displayed and the system will halt. These systems are shipped with non-ECC modules only.

An installed mix of memory module types is acceptable but operation will be constrained to the level of the module with the lowest (slowest) performance.

If an incompatible memory module is detected the NUM LOCK will blink for a short period of time during POST and an error message may or may not be displayed before the system hangs.

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Technical Reference Guide

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.