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Technical Reference

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NOTE

IBM PS/2 Port Specification (Sept 1991) states:

• 275 mA for keyboard

• 70 mA for the mouse (nonwake-enable device)

PCI/AGP requirements are calculated by totaling the following:

• One wake-enabled device @ 375 mA, plus

• Five nonwake-enabled devices @ 20 mA each, plus

USB requirements are calculated as:

• One wake-enabled device @ 500 mA

• USB hub @ 100 mA

• Three USB nonwake-enabled devices connected @ 2.5 mA each

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NOTE

Both USB ports are capable of providing up to 500 mA during normal G0/S0 operation. Only one

USB port will support up to 500 mA of stand-by-current (wake-enabled device) during G1/S3

suspended operation. The other port may provide up to 7.5 mA (three nonwake-enabled devices.)

during G1/S3 suspended operation.

2.11.4 Fan Connector Current Capability

The D850GB board is designed to supply a maximum of 225 mA per fan connector.

2.11.5 Power Supply Considerations

CAUTION

The 5-V standby line for the power supply must be capable of providing adequate +5 V standby

current. Failure to do so can damage the power supply. The total amount of standby current

required depends on the wake devices supported and manufacturing options. Refer to

Section 2.11.3 on page 74 for additional information.

System integrators should refer to the power usage values listed in Table 51 when selecting a

power supply for use with the D850GB board.

Measurements account only for current sourced by the D850GB board while running in idle modes

of the started operating systems.

Additional power required will depend on configurations chosen by the integrator.

The power supply must comply with the following recommendations found in the indicated

sections of the ATX form factor specification.

• The potential relation between 3.3 VDC and +5 VDC power rails (Section 4.2)

• The current capability of the +5 VSB line (Section 4.2.1.2)

• All timing parameters (Section 4.2.1.3)

• All voltage tolerances (Section 4.2.2)

For information about Refer to

The ATX form factor specification Section 1.3, page 16

Intel D850GB User Manual

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