Intel Desktop Board DB85FL Technical Product Specification
54
2.5
Electrical Considerations
2.5.1
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 Power Supply Unit (PSU)
protection from triggering during minimum loading.
Intel recommends that system integrators and builders check the latest list of tested
PSUs to find out which are 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 are capable of supporting 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 V
STBY
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.
For example, for a low power system consisting of a supported 45 W processor (see
Section 1.3 on page 16 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.
For information about
Refer to
Selecting an appropriate power supply
http://support.intel.com/support/motherboards/desktop/sb
/CS-026472.htm
Selecting a power supply capable of
supporting the 4
th
generation Intel Core
processor
http://www.intel.com/go/powersupplies/
