From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
computer nut /kəmpjˈuːtə nˈʌt/
Computernarr <masc>, Computerfreak <masc>
Synonyms: computer enthusiast, computer buff, computer jock
see: enthusiast, nut, buff, jock, fanatic, fan, enthusiasts, nuts, buffs, jocks, fanatics, fans, opera buff, fanboy, fangirl, fitness fanatic, fitness nut, sport enthusiast, sports buff, sports jock