Yep. Maybe add another intake and top exhaust to help the rest of the case...depends on your gpu. Anything like a 970 or below probably ok. AMD 380 onwards may need a bit more case flow.
I don't have another place to put a fan, unless I cut a hole to make one somewhere. I have a Raidmax Cobra case. So if you know of another place to put a fan (other than the back or the front) I'd love to know about it. And I have a MSI 970