F
fan 
installing 146
removing 145
replacing 145
fan cage 
installing 144
removing 143
replacing 143
firmware 
update 9
firmware updates 9
flash power module 
installing 149
removing 147
replacing 147
front I/O expansion board 63 
installing 249, 280
removing 248, 279
replacing 248, 279
front I/O expansion board module 
installing 277
removing 275
replacing 275
front I/O module 26 
installing 151
removing 150
replacing 150
front panel 25 
installing 157
removing 155
replacing 155
front view 
4-DW GPU Model 16
8-DW GPU Model 18
SXM GPU Model 21
G
gaseous contamination 8
Getting help 367
GPU adapter 
installing 253
removing 250
replacing 250
GPU adapter link bridge 
installing 262
removing 260
GPU adapter link bridge replacement 
replacing 260
GPU distribution board 61 
installing 258
removing 255
replacing 255
guidelines 
options installation 121
system reliability 123
H
handling static-sensitive devices 123
hard disk drive problems 353
hardware service and support telephone numbers 369
heat sink 
installing 206
removing 200
replacing 200
separating 204
heat sink nut 
installing 161
removing 159
replacing 159
help 367
I
important notices 372
install 
system board 218
installation 
guidelines 121
installation guidelines 121
installing 
2.5 inch drive backplane 234
2.5-inch drive backplane 274
2.5-inch drive backplane module 271
2.5-inch drive cage assembly 237, 269
2.5-inch hot-swap drive 230, 265
3.5 inch drive backplane 234
3.5-inch drive cage assembly 237
3.5-inch hot-swap drive 230
air baffle 135
CMOS battery (CR2032) 138
cover 226
DRAM memory module 175
drive 241, 265
EDSFF drive backplane 245
EDSFF drive cage assembly 247
EDSFF hot-swap drive 241
external LCD diagnostics handset 141
fan 146
fan cage 144
flash power module 149
front I/O expansion board 249, 280
front I/O expansion board module 277
front I/O module 151
front panel 157
GPU adapter 253
GPU adapter link bridge 262
GPU distribution board 258
heat sink 206
heat sink nut 161
intrusion switch 163
L2A 289
Lenovo Neptune(TM) liquid-to-air (L2A) hybrid cooling module 
replacement 289
M.2 backplane 170
M.2 drive 169
memory module 175
network adapter 180
OCP Ethernet adapter 182
PCIe adapter 188
PCIe riser 189
PCIe riser board 193
PDB 196
PHM 206
PMEM, Persistent Memory 175
power distribution board 196
power supply unit 198
processor 206
processor heat sink module 206
PSU 198
retimer assembly 322
serial port module 213
server 127
SXM GPU 299
SXM GPU board 305
SXM GPU power distribution board 314
top cover 226
Torx T30 nut 161
insufficient PCIe resource 
solving 355
intermittent problems 357
internal connectors 58, 61, 63
376 ThinkSystem SR670 V2 Maintenance Manual