Intel Desktop Board DQ77MK Technical Product Specification
66
2.6
Electrical Considerations
2.6.1
Power Supply Considerations
CAUTION
The +5 V standby line from 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.
Additional power required will depend on configurations chosen by the integrator.
The power supply must comply with the indicated parameters of the ATX form factor
specification.
•
The potential relation between 3.3 V DC and +5 V DC power rails
•
The current capability of the +5 VSB line
•
All timing parameters
•
All voltage tolerances
For example, for a high power system consisting of a supported 95 W processor (see
Section 1.3 on page 18 for a list of supported processors), 4 GB DDR3 RAM, one high
end video card, one hard disk drive, one optical drive, and all board peripherals
enabled, the minimum recommended power supply is 460 W. Table 36 lists possible
recommended power supply current rail values.
Table 36. Recommended Power Supply Current Values (High Power)
Output Voltage
3.3 V
5 V
12 V1
12 V2
-12 V
5 VSB
Current
22 A
20 A
20 A
20 A
0.3 A
2.5 A
For example, for a low power system consisting of a supported 45 W processor (see
Section 1.3 on page 18 for a list of supported processors), 2 GB DDR3 RAM, integrated
graphics, one SSD, one optical drive, and no extra onboard peripherals enabled, the
minimum recommended power supply is a 320 W. Table 37 lists possible
recommended power supply current rail values. Note: If the correct power supply and
system configuration is used, a smaller power supply will work.
Table 37. Recommended Power Supply Current Values (Low Power)
Output Voltage
3.3 V
5 V
12 V1
12 V2
-12 V
5 VSB
Current
20 A
20 A
15 A
15 A
0.3 A
1.5 A
For information about
Refer to
Selecting an appropriate power supply
http://support.intel.com/support/motherboards/desktop/sb
/CS-026472.htm
Summary of Contents for DQ77MK
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