What do you mean by an "impact factor of 2?"
If you're an Intl. student, 820 might be below what top 10 are looking for. However, schools claim that applications are considered in terms of GPA, GRE, Recommendation and Research Exp. There is simply not just one single criteria that can get you in or out.
By the way, which area are you looking at? If you need further opinions, post your profile in the 2009 Profile thread.