Certainly, if I had the time, I would retake it, though it is the least important factor. My gut feeling is that your application would not automatically be filtered out based on your GRE scores, but these places like Berkeley and Stanford get so many applications that I really don't know what they do. For all I know, the graduate secretary filters them out based on her own heuristics.
I know I read that Berkeley likes to see at least a 770 on the quantitative, but I really don't know what that means since they also say research is most important.
Also, this has some info that may be a little outdated but still relevant:
Computer Science Admission Requirements of Top USA Schools | Admission Sync
And there is this advice from a faculty member at CMU:
Quote:
Your score on the GRE will be largely ignored by the top schools, particularly if you are coming from a top school. At CMU we look at the Verbal GRE score only when the applicant is not a native speaker of English. We look at the Subject test score only when we have an application from a school whose CS department we’re not familiar with.
http://www.cs.cmu.edu/%7Eharchol/gradschooltalk.pdf
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So I really don't know. Your best bet may be asking the departments in question and tell them about your situation (spending more time on research vs. more time on GRE).