Frequency can also be given by posting 'I also have this issue' and your report in any of the above threads (preferably the first).
True, the guidelines don't really talk about duplicates, they are more for the format of the bug posts (like posting your debug.err to pastebin.com), and the title [Bug/Graphics].
Duplicates are referred to in the beta requirements and known issues sticky, though admittingly they could be a tad clearer on the subject.
Kryo, the guy in charge of organizing the issues here, certainly would like to know if problems are duplicates (see here).