Hardware Reference
In-Depth Information
Figure 18.25
Peripheral to +12V power adapter.
Eight-Pin +12V CPU Power Connector
High-end motherboards often use multiple voltage regulators to supply power to the pro-
cessor. To distribute the load among the additional voltage regulators, these boards may
usetwo4-pin+12Vconnectors;however,theyarephysicallycombinedintoasingle8-pin
connectorshell(see
Figure18.26
).ThistypeofCPUpowerconnectorwasfirstdefinedin
the EPS12V power supply specification version 1.6 released in the year 2000. Although
this specification is intended for file servers, the increased power requirements of some
high-power PC processors has caused this connector to appear on desktop PC mother-
boards supporting these processors.
Figure 18.26
Eight-pin +12V CPU power connector, side and terminal end view.
The pinout of the 8-pin +12V CPU power connector is shown in
Table 18.16
.
Table 18.16 Eight-Pin +12V CPU Power Connector Pinout (Wire End View)
Some motherboards that utilize an 8-pin +12V CPU power connector must have signals
connected to all 8 pins for the voltage regulators to function properly, while most will
