Right now I am using Radeon 6780. It is a limited edition card but as far as I now it is "9 long. My case is an Lian Li PC-602 or a model almost identical. As far as I know the GPU I am getting(PNY GTX 770) is like "11 long it does not look like I have room but there is some things screwed in that are in way.... Maybe they can come out???