http://www.newegg.com/Product/Product.aspx?Item=N82E16811129203 Antec Eleven Hundred V2 has 9 in a row instead of the one above. Good luck man, that's going to be a tight fit. Hope you watercool so those GPU's that are hugging don't turn into a supernova.
http://www.corsair.com/en-us/carbide-series-air-540-high-airflow-atx-cube-case According to the corsair website, the Air 540 supports quad GPU's. I'm sure there are more cases, I'm just throwing this one out there.
Very nice case, forgot to mention that I need 9 expansion slots, since I also have a sound card
This http://www.coolermaster.com/case/mid-tower/haf-xm/ Haf XM has 8 and another 1 above them. You would need some sort of PCI ribbon extender to have the sound card up there, but it could work.
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129203 Antec Eleven Hundred V2 has 9 in a row instead of the one above. Good luck man, that's going to be a tight fit. Hope you watercool so those GPU's that are hugging don't turn into a supernova.