well, I think you don't have to worry about this. Competition in CS department is not that though, and beeing in the 90th percentile must be showing a good achievement in physics. I am applying to Electrical engineering in Berkeley, and I even wonder if my score of 990 in Gre physics will be helpful, because it's not exactly the topic, and i'm an international so all international should be strong in gre physics (a test designed for american students).
I would worry more about having done research in the past linked with computer science, such as Numerical Analysis. I did this before, so I hope they won't reject me too