So you're pulling ~660 per card for right under 2GH ? Nice.
I would do that if I had the kind of money to drop on 6990s... unfortunately I have to spread my 2GH over multiple miners

I only have about $1750 invested of which 1000 is already paid for over my first 3 weeks and resale value of all hardware puts me in the green 3-4 weeks in.