I think he was asking about scrypt altcoin mining. But 7.5 Th is impressive ..hopefully you receive it early 2014, don't know how impressive it will be the second half of the year.

My current setup gives me between 8000-8500 Kh/s considering variance. One card is out of commission due to bad vram I think, hopefully get it RMA'd and back online for 9000+. Still a small fish in the pool.  

What coin are you mining? If it is within your budget, should give some radeon cards some thought ..but I'm sure you're probably already aware they're better performers vs nVidia.

Welcome btw