I've heard of 6500 DPS being sufficient to clear... and 8000 DPS being insufficient. The trick, of course, is that this all fails to account for AoE damage sources going on, exact strategies, things like positioning of mobs for auto-AoE parts of the rotation (eg Elixir Drive), etc

Point is, the requirement on DPS is currently very high, and players are pretty much going to have to have some healer DPS added as well.