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EPS2U Power Supply Design Guide, V2.1
6 DC Output Specification
6.1 Output Connectors
The power supply shall have one of the two following output connector and wire harness configurations,
depending upon the type of 12V rail configuration needed by the system.
6.1.1 12V Power Rail Configurations
There are two types of 12V rail configurations for systems: ‘Common plane’ and ‘split plane’ processor power
delivery. The ‘common plane’ system has both processors powered from a single 12V rail (+12V1) from the
power supply. The ‘split plane’ system has both processors powered from separate 12V rails (+12V1 and
+12V2), one dedicated to each processor. The system, in both cases, has an additional 12V rail to power the rest
of the baseboard +12V loads and dc/dc converters. +12V1, +12V2, and +12V3 should not be connected together
on the baseboard to ensure that 240VA protection circuits in the power supply operate properly.
Table 6: 12V Rail Summary
Common Plane System Split Plane System
+12V1 Processors +12V1 Processor 1
+12V2 Baseboard components other
than processors
+12V2 Processor 2
+12V3 Drives and peripherals +12V3 Baseboard components other than
processors
+12V4 Drives and peripherals
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