To give you an idea, I have a CM690II and a V6GT, and it pretty much fits in the case like this:http://www.coolermaster.com/upload/product/6668/featured/top4.jpg?1023084636
The 690II is also listed at 8.4" wide. The V6 is tall, but not tall enough to get dangerously close to the side panel. A possible trade-off is that I may only be able to mount 1 fan instead of 2 on my side panel. But looking at the side panel of the DF85, you should still be able to mount a fan on the side.