2.  If  you  are  planning  to  install  or  remove  a  microprocessor,  memory  module,  PCI 
adapter,  battery,  or  other  non-hot-swap  optional  device,  turn  off  the  server  and 
all  attached  devices  and  disconnect  all  external  cables  and  power  cords  (see 
“Turning  off  the  server”  on  page  39).
 Attention:  In  a  dc  power  environment,  only  trained  service  personnel  other 
than  IBM  service  technicians  are  authorized  to  connect  or  disconnect  power  to 
the  dc  power  supply.  See  the  documentation  that  comes  with  each  dc  power 
supply. 
3.  Press  down  on  the  left  and  right  side  latches  and  pull  the  server  out  of  the  rack 
enclosure  until  both  slide  rails  lock. 
Note:  You  can  reach  the  cables  on  the  back  of  the  server  when  the  server  is  in 
the  locked  position. 
Cover-release
latch
 
 
4.  Lift  the  cover-release  latch.  Lift  the  cover  off  the  server  and  set  the  cover  aside. 
Attention:  For  proper  cooling  and  airflow,  replace  the  cover  before  you  turn  on 
the  server.  Operating  the  server  for  extended  periods  of  time  (more  than  30 
minutes)  with  the  cover  removed  might  damage  server  components. 
Installing  a  memory  module 
The  following  notes  describe  the  types  of  dual  inline  memory  modules  (DIMMs)  that 
the  server  supports  and  other  information  that  you  must  consider  when  installing 
DIMMs: 
v  The  server  supports  up  to  12  Fully  Buffered  DIMM  PC2-5300  512  MB,  1  GB,  2 
GB,  and  4  GB  DIMMs,  for  a  maximum  of  48  GB  of  system  memory.  See 
http://www.ibm.com/servers/eserver/serverproven/compat/us/  for  a  list  of  memory 
modules  that  you  can  use  with  the  server. 
Note:  Because  some  memory  is  reserved  for  system  operation,  the  actual 
usable  memory  size  that  is  reported  by  the  operating  system  is  less  than  the  total 
installed  size. 
v  The  server  comes  with  a  minimum  of  two  512  MB  DIMMs,  installed  in  slots  1  and 
4.  When  you  install  additional  DIMMs,  you  must  install  two  identical  DIMMS  at  a 
time,  in  the  order  shown  in  the  following  table,  to  maintain  performance. 
 
12  IBM  System  x3650  Type  7979:  Installation  Guide