Intel ATX 0.9 User Manual

Intel ATX Power Supply Design Guide
Version 0.9

Page 12

3.3 Typical Power Distribution

Although power requirements and distributions will depend on the specific system options
and implementation, this section identifies several potential configurations. For a single
processor mini-tower configuration with one ISA slot, three PCI slots, one shared slot, and
six peripheral bays, a minimum 160 W sustained (200 W peak) power supply should be
sufficient for a typical application. For a full tower, dual processor configuration with one
ISA slot, five PCI slots, one shared slot, and six peripheral bays, a 300 W sustained power
supply should be sufficient. Tables 4, 5, 6, and 7 list the suggested power distribution for
various configurations and applications.

Table 4: Typical Power Distribution for a 160 W Configuration

Output

Min.
Current
(amps)

Max.
Current
(amps)

Peak
Current
(amps)

Notes:

+12VDC

0.0

6.0

8.0

+5VDC

1.0

18.0

+3.3VDC and +5VDC combined power 110 W max

+3.3VDC

0.3

14.0

Pin 11 default +3.3 V sense required

-5VDC

0.0

0.3

-12VDC

0.0

0.8

+5VSB

0.0

0.72

See Section 3.4.3.

Table 5: Typical Power Distribution for a 200 W Configuration