Part of the trouble is that computer advice that you can just go and read is inherently going to be nonspecific, and it's likely to be out of date already, too.

For instance, with your question, here's how it might be answered.

1) What sort of work are you trying to do with it? Heavy games? Number crunching / simulation? Word processing and basic internet work? On-site work with clients or suppliers?

Okay, now the question has to be split into four or five. Unfortunately, this sort of thing is never goign to be able to equal real live tech support.