If I get 30 upvote in answers with a particular tag, does it calculate 30 score for me in top users section or just 20 score ? ( considering maximum daily reputation of 200 for upvotes )
Alright, I'll go ahead and pull out my comment into an answer.
As noted in the comments here:
@yes Only upvotes and downvotes, and only the corresponding score. It has no effect to or from reputation, so things such as votes that give no reputation due to the reputation cap, they still count. – Grace Note ♦ Jun 1 '11 at 18:19
and a little further down
@yes123 Score is not derived from reputation, as mentioned in my previous comment, so it is not affected by the reputation cap. – Grace Note♦ Jun 2 '11 at 15:07
Plus, as @ShadowWizard notes, @Gamemorize's score on English Language & Usage in the "phrase-requests" tag, as shown here, is currently 117 (and will be 150+ once it updates again), but the only post with a nonzero score was made just two days ago.
This pretty much definitively shows that the Top Users score is not affected by the daily reputation limit.