Fan Connector Current Capability; Power Supply Considerations - Intel D850GB Technical Product Specification

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
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
The ATX form factor specification
Technical Reference
Refer to
Section 1.3, page 16
75