System-board  internal  connectors  and  switches 
The  following  illustrations  show  the  internal  connectors  and  switches  on  the  system 
board. 
DIMM 12
DIMM 6
DIMM 11
DIMM 5
DIMM 10
IDE
DIMM 4
DIMM 9
DIMM 3
DIMM 8
DIMM 2
DIMM 7
DIMM 1
Microprocessor 1
Microprocessor 2
VRM
Battery
ServeRAID-8k
PCI slot 6
PCI-X slot 5
PCI-X slot 4
PCI Express x8
with x8 links slot 1
PCI Express x8
with x8 links slot 2
PCI Express x8
with x8 links slot 3
Remote
Supervisor
Adapter
Power 1
Power 2
Power 3
Power switch
SAS 2
SAS 2 power
SAS 1
SAS 1 power
Rear fan
(optional)
Reserved
Front USB
Internal USB tape
Wake on LAN
 
 
See  Table  2  for  information  about  the  switch  settings. 
Wake on LAN
(CN 45)
SW4 (Boot block/Clear CMOS)
 
 
 
Table  2.  Switches  on  SW4 
Switch  number  Description 
1  Boot  block: 
v  Leave  the  switch  in  the  off  position  for  normal  mode. 
v  Move  the  switch  to  the  on  position  to  enable  the  system 
to  recover  if  the  BIOS  code  becomes  damaged. 
 
14  IBM  System  x3500  Type  7977:  User’s  Guide