CPU improves support drone damage output as well as the efficiency of support spells: healing, shields, damage buffs etc.
Read the support gear descriptions to see the effect of CPU.
It gives you a level 0 PvP shield everytime you respawn, preventing all players from attacking you as long as your shield is not altered.
If you attack another player, a drone or a planet or if you heal another player in combat, the PvP protection will be disabled and your shield will be set at the victim's level.
Shield will be reset after death.