Not necessarily. Besides there are different types of geekiness. I associate computer nerdiness/geekiness with ISTJs. They are definitely IxTJs, but that sort of thing is not an Ni thing. That's why ISTJ is the best fit. The reason why they may seem like Ns is because they're generally 5s. I know ISTJs aren't usually associated with being 5, I was just pointing out that the type of computer nerd you are talking about is generally an ISTJ 5w6 Sp/So. There are many different kinds of geekiness/nerdiness (i.e., xNFP geekiness/nerdiness is generally associated with role-playing, fantasy, story-telling, anime, etc., xNTP geekiness/nerdiness is generally associated with book-worming, "thinking", theorizing, abstractness, etc., xSTJ geekiness/nerdiness is generally associated with studying, programming, techie stuff (take my dad, for example, who is an ESTJ who is a computer tech), memorizing obscure stuff, political interest, etc., and INxJ geekiness/nerdiness is generally associated with analyzing, researching, scientist, etc.), but the type of nerdiness/geekiness you speak of is not that typical of stereotypical INTPs.