The Camarader-E perk has five levels and each circuit board you collect towards the completion of the ED-Ecated quest gives ED-E a bonus upgrade. There are a total of 5 eyebot upgrade circuit board in broken eyebots found throughout the divide. Each rank of this perk has a different effect;
Fast travel to the Cave of the Abaddon, come out of the cave and subsequent building going southeast. There should be a nuke to blow up. Once it's destroyed, go to the blast site (past the blue old world flag) to find the sparking ED-E.
Municipal Sewers - Accessed from the Third Street Municipal Building via sewer style entrance. On the left as you enter.
The name of this perk is a reference to the word "camaraderie" which means the quality of affording easy familiarity, which makes sense because both models of ED-E get these perks.