This is in response the Ragge's identification of 'CPU type 11'. 
This is what I found when I opened the case; I hope it helps :)

DEC VAXstation 3100 M76 SPX  Model VS43A-CZ
 
Video sub-board (mounts on top of main board)
 
Video array 1:
 
  LSI Logic
  L1A5099
  21-32304-01
  DC7160
  NAC 9120
 
Video array 2:
  (DEC)
  21-30389-01
  G754-32 9121
 
Main board   Ass'y #54-19847-B05
 
CPU (?):
  LSI Logic
  L1A5029
  21-28651-03
  DC7098D
  NAC 9105
 
ROMS: 
 
  23-134E8-00 AYO LT 9118
  23-135E8-00 AYO LT 9118
 
Array 1 (w/ heatsink):
 
  DEC 523E
  21-25090-02
  G686-29 9118
            
Array 2 (W/ heatsink):
 
  DEC DC520H
  21-25088-10
  G661-28 9117
 
Another large IC:
 
  (DEC)
  21-25088-02
  G797-34 9117
 
Network Controller (?):
 
  Toshiba
  21-30367-02
  TC110G21AY
  0022 9043EAI