Need some airflow advice.

Would implementing this airflow cool my GPU pretty well? Right now it idles at 51C, sometimes going as high as 77C (during gaming) and I have a 120mm at 1 pulling in and a 120mm at 3 pulling out. It's a 7970.
Also my motherboard only has two chassis fan connectors, so I might get a fan controller. How do fan controllers work? Where do they go? How do they connect?
EDIT: My room is usually between 65-80F