Technical Reference
63
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.
Due to improvements in 4
th
generation Intel Core processor power efficiency, the
requirements for the processor’s power supply have changed. More specifically, the
latest Power Supply Design Guide rev 1.3 has indicated a minimum current of 0.05A
on +12 V2DC, and recommends 0A. This is to prevent PSU protection triggering during
minimum loading.
Intel recommends that system integrators and builders check the latest list of tested
PSUs for ones capable of supporting the 4
th
generation Intel Core processor. This list
may be found at: http://www.intel.com/go/powersupplies/
. From the filters at the top
right of the page, set 12V2 Min Load 0A to “Yes” to see which PSUs have been found
to support the processor’s new power requirements.
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 16 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 31 lists possible
recommended power supply current rail values.
Table 31. 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
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