Dell Precision 7920 Tower Owner's Manual page 66

Figure 2. HDD Fans
NOTE: Availability of these fans are dependent on configuration ordered.
Table 2. Fan and Cable Description
Fan Cable Description
CPU 1 Fan CPU 1 fan cable
Front System Fan0 cable
Fans
Fan1 cable
Fan2 cable
Fan3 cable
Rear System Fan0 cable
Fans
Fan1 cable
HDD Fans Fan in Flex0
Fan in Flex1
Fan in Flex2
Fan in Flex3
Fan in Flex4
66 Removing and installing components
Silk Screen
FAN_CPU1
FAN_SYS0
FAN_SYS1
FAN_SYS2
FAN_SYS3
FAN_REAR0
FAN_REAR1
FAN_FLEX0
FAN_FLEX1
FAN_FLEX2
FAN_FLEX3
FAN_FLEX4
Fan Installation Guide
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Depend on shipped configuration