Power and Signal Distribution

7.3.3 Power Management

These systems include power management functions designed to conserve energy. These functions are provided by a combination of hardware, firmware (BIOS) and software. The system provides the following power management support:

■ACPI v2.0 compliant (ACPI modes C1, S1, and S3-S5)

■APM 1.2 compliant

■U.S. EPA Energy Star 3.0 and 4.0 compliant

Table 7-6 shows the comparison in power states.

Table 7-6.

System Power States

 

 

 

 

 

Power

 

Power

Transition

OS Restart

State

System Condition

Consumption

To S0 by [2]

Required

G0, S0, D0

System fully on. OS and

Maximum

N/A

No

 

application is running, all

 

 

 

 

components.

 

 

 

 

 

 

 

 

G1, S1, C1, D1

System on, CPU is executing and

Low

< 2 sec after

No

 

data is held in memory. Some

 

keyboard or

 

 

peripheral subsystems may be on

 

pointing device

 

 

low power. Monitor is blanked.

 

action

 

 

 

 

 

 

G1, S2/3, C2,

System on, CPU not executing,

Low

< 5 sec. after

No

D2 (Standby/or

cache data lost. Memory is

 

keyboard, pointing

 

suspend)

holding data, display and I/O

 

device, or power

 

 

subsystems on low power.

 

button action

 

 

 

 

 

 

G1, S4, D3

System off. CPU, memory, and

Low

<25 sec. after

Yes

(Hibernation)

most subsystems shut down.

 

power button

 

 

Memory image saved to disk for

 

action

 

 

recall on power up.

 

 

 

 

 

 

 

 

G2, S5, D3cold

System off. All components either

Minimum

<35 sec. after

Yes

 

completely shut down or receiving

 

power button

 

 

minimum power to perform system

 

action

 

 

wake-up.

 

 

 

 

 

 

 

 

G3

System off (mechanical). No power

None

—

—

 

to any internal components except

 

 

 

 

RTC circuit. [1]

 

 

 

NOTES:

Gn = Global state.

Sn = Sleep state.

Cn = ACPI state.

Dn = PCI state.

[1]Power cord is disconnected for this condition.

[2]Actual transition time dependent on OS and/or application software.

 

Technical Reference Guide

www.hp.com

7-9

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HP dc7800 tower System Power States, State System Condition, Power Transition OS Restart, Consumption To S0 by Required
Page 86 Page 88

dc7800 tower specifications

The HP dc7800 Tower is a powerful desktop computer designed for professional and enterprise environments. Known for its stability, performance, and versatility, this model has secured its place in a variety of business settings. Launched in the mid-2000s, it embodies HP’s commitment to quality and innovation.

One of the main features of the HP dc7800 is its form factor. The tower configuration allows for easy upgrades and maintenance, providing ample space for additional hard drives, memory, and other components. This level of accessibility makes it ideal for businesses that need to adapt their systems to changing requirements.

The dc7800 is powered by Intel's Core 2 Duo processors, offering dual-core technology that enhances multitasking capabilities. With clock speeds ranging from 1.8 GHz to 3.0 GHz, this system can handle demanding applications with relative ease. It also supports Intel's vPro technology, which allows for remote management and security features, making it an excellent choice for organizations prioritizing IT control.

Another notable characteristic is the support for up to 8GB of DDR2 RAM. This allows for efficient data processing and improved performance when running multiple applications simultaneously. Additionally, the dc7800 features multiple storage options, accommodating both SATA hard drives and solid-state drives, which can significantly enhance boot times and overall system responsiveness.

Connectivity options on the HP dc7800 are robust. It includes a variety of USB ports, audio jacks, and optional legacy ports, ensuring compatibility with a wide range of peripherals and accessories. Networking capabilities are also prominent, with built-in Gigabit Ethernet providing high-speed internet access.

Furthermore, the desktop tower is designed with energy efficiency in mind. It meets ENERGY STAR certification standards, which not only helps reduce operational costs but also minimizes environmental impact.

Overall, the HP dc7800 Tower embodies a blend of performance, expandability, and energy efficiency, making it a reliable choice for businesses in need of a robust desktop solution. With its legacy of dependability and its suite of modern technologies, it continues to serve as a valuable asset in enterprise environments.
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