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)

U.S. EPA Energy Star 3.0 and 4.0 compliant

Table 7-5 shows the comparison in power states.

Table 7-5.

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

7-7

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HP dc5850 manual System Power States, State System Condition, Power Transition OS Restart, Consumption To S0 by Required

dc5850 specifications

The HP dc5850 is a desktop computer that was designed for business environments, offering a blend of performance, reliability, and efficiency. Released during the height of the mid-2000s, this system is powered by AMD processors, particularly the Athlon or Phenom series, which ensures that it can handle various computational tasks with ease.

The dc5850 features a compact chassis that adheres to the Microtower form factor. This design not only saves space but also allows for easier upgrades and maintenance. The unit typically supports a range of RAM configurations, with options for up to 8GB of DDR2 memory. This flexibility enables the user to tailor the system's performance according to their needs, whether for basic office tasks or more demanding applications.

Storage options on the HP dc5850 include a 3.5-inch HDD that can accommodate substantial data, with capacities typically ranging from 160GB to 1TB. The inclusion of a SATA interface ensures fast data transfer rates, which is essential for improving overall system performance. Moreover, the dc5850 boasts multiple USB ports, including USB 2.0 and sometimes even USB 3.0, facilitating easy connectivity with peripherals such as printers, scanners, and external drives.

Graphics capabilities on the dc5850 are generally provided by integrated solutions, although users have the option to add discrete graphics cards for enhanced performance in visual tasks. The system often comes with integrated audio, which supports basic multimedia needs without requiring additional sound cards.

In terms of connectivity, the HP dc5850 features built-in Ethernet for wired networking and may also offer options for Wi-Fi capabilities via PCI expansion slots. This makes it suitable for networked business environments, enabling seamless integration into office infrastructures.

The system is designed with energy efficiency in mind, complying with various environmental standards, thereby reducing its carbon footprint. This aspect may also lead to lower operational costs for businesses focused on sustainability.

Overall, the HP dc5850 stands out as a versatile desktop solution, catering to the essential needs of small to medium-sized businesses. With its combination of performance, expandability, and energy efficiency, it remains a noteworthy choice for users seeking reliable computing power in a compact and manageable form.