Central Processing: Primary Server Bank

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Doom 3 maps
Central Processing: Primary Server Bank
Map name: game/cpuboss
"Welcome to the Mess Hall!"
― Sabaoth [source]

Central Processing: Primary Server Bank (called Central Server Banks: Primary Server Bank in Doom 3: BFG Edition) is the twenty-third level of Doom 3. The player fights the third boss, Sabaoth, the demon transformation of Sergeant Kelly.


Spoiler Warning: Plot details follow.

The marine enters the Primary Server Bank and faces a host of monsters almost immediately while the demonified Sergeant Kelly taunts him over the loudspeakers. After clearing out the CPU complex, the marine goes to the Central Bridge which is positioned within a massive chamber leading to multiple sections of the facility. The marine must reach Central Processing where Sergeant Kelly is located. However, he first needs to find Steve Tooloose's PDA to gain access.

The marine heads to the Server Bank and recovers Tooloose's PDA. There is also an informational video on the BFG 9000. The video reveals that small arms ballistics can cause the BFG projectile to detonate prematurely.

The marine makes it to Central Processing, where he finds Sergeant Kelly waiting for him. The Sergeant has been transformed into a hideous tank-like monster called Sabaoth. He has also integrated Campbell's BFG into his body, and uses it against the marine. The marine, however, uses his newly acquired knowledge of the BFG's weaknesses against Sabaoth. After an extended fight, the marine defeats his former commanding officer, and takes Campbell's BFG for himself. He then heads down into Sublevel 9 and takes the elevator to the next level: Site 3.


Security Bridge
Obtain security clearance to access central processing
Spoilers end here.


Video disks[edit]



The enemy count on Nightmare is the same as on Veteran. There are no changes in enemy amount in the BFG Edition.

Enemies Recruit Marine Veteran
Imps 12 14
Trites 13 17
Wraiths* 9
Cacodemons 4 6
Revenants 4 5
Tentacle commandos 3 5
Chain gun commandos 2
Arch-viles 3
Sabaoth 1

* Wraiths in this level are spawned by the arch-viles, thus their amount can vary. Here only number of distinct spawn points is shown.


The item count on Nightmare is the same as on Veteran, except the med kits are absent. There are no changes in the amount of items in the BFG Edition.

Items Recruit Marine Veteran
Plasma guns 1
Rocket launchers 1
BFG 9000s 1
Bullets (small) 2
Shells (large) 5
Clips (small) 2
Clips (large) 9 8
Ammo belts 11
Grenades 2
Cells (small) 11
Cells (large) 1
Rockets (large) 7 4
BFG cells 1
Med kits (small) 3
Med kits (large) 12
Armor shards 34
Security armor 6 5
Adrenaline 3

There is one health station on the level, with 80 health in reserve (it has 100 health in BFG Edition).


  • In Serverbanks area, there are items located on top of the data banks in the lower floor. To access them, the player needs to break a cracked window on the upper floor and jump on the banks through it.


External links[edit]

  • Walkthrough video by WoopzillaWalkthrough (part 1; part 2) on YouTube. Veteran difficulty; part of a full game run.