Intel Desktop Board D845EPI Technical Product Specification
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2.11 Electrical Considerations
2.11.1 DC Loading
Table 32 lists the DC loading characteristics of the board. This data is based on a DC analysis of
all active components within the board that impact its power delivery subsystems. The analysis
does not include PCI add-in cards. Minimum values assume a light load placed on the board that
is similar to an environment with no applications running and no USB current draw. Maximum
values assume a load placed on the board that is similar to a heavy gaming environment with a
500 mA current draw per USB port. These calculations are not based on specific processor values
or memory configurations but are based on the minimum and maximum current draw possible
from the board’s power delivery subsystems to the processor, memory, and USB ports.
Use the datasheets for add-in cards, such as PCI and AGP, to determine the overall system power
requirements. The selection of a power supply at the system level is dependent on the system’s
usage model and not necessarily tied to a particular processor speed.
Table 32. DC Loading Characteristics
DC Current at:
Mode DC Power +3.3 V +5 V +12 V -12 V +5 VSB
Minimum loading 190.00 W 5.00 A 11.00 A 9.00 A 0.03 A 0.60 A
Maximum loading 286.00 W 11.00 A 15.00 A 13.00 A 0.10 A 1.40 A
2.11.2 Add-in Board Considerations
The Desktop Board D845EPI is designed to provide 2 A (average) of +5 V current for each add-in
board. The total +5 V current draw for add-in boards for a fully loaded Desktop Board D845EPI
(all four expansion slots filled) must not exceed 8 A.
2.11.3 Fan Connector Current Capability
CAUTION
The processor fan must be connected to the processor fan connector, not to a chassis fan
connector. Connecting the processor fan to a chassis fan connector may result in onboard
component damage that will halt fan operation.
Table 33 lists the current capability of the fan connectors on the Desktop Board D845EPI.
Table 33. Fan Connector Current Capability
Fan Connector Maximum Available Current
Processor fan 1.00 A
Front chassis fan 1.00 A
Rear chassis fan 1.00 A
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