Oracle X5-8 Service Manual page 21

The chassis internal components include:
Call Component
Out
1 CPU module
(CMOD) bays
2 Midplane/busbar
Description
CMOD bays can support either four or eight CMODs. Servicing CMODs requires
warm or cold service.
For information about the CMODs, see
Overview" on page 23.
The mid-plane assembly provides an interconnect between the backside components
and the front-side components. This component requires cold service.
Chassis Overview
"CPU Module (CMOD)
Server and Components Overview 21