HP Z400 Maintenance And Service Manual page 244

Designator
P66 - P67
P70
P93
P94
P124
XBT1
XMM1 - XMM6
XU1
232 Appendix B System board designators
Silk screen
P66 - P67
SATA4 - SATA5
P70 CPU0 FAN
P93 FRNTFAN
P94 IOH FAN
P124 HLCK
XBT1 BAT
4-DIMM: XMM1-XMM4, DIMM1-DIMM4
6-DIMM: XMM1-XMM6, DIMM1-DIMM6
XU1 CPU0
Component
SATA Connectors
Primary CPU fan header
Front fan header
IOH fan header
Side access panel solenoid lock header
Battery holder
Memory slots
Primary CPU socket
ENWW