...was the bottleneck purely in the GPU?
Also. They're recommending a GTX 660 when it comes to the GPU. I recon that a 970 which is so much more powerful will destroy it. It should in all honesty. Considering that the PS4 version runs really stable at 30fps (It does. The drops in the middle of the city are minor and even during heavy explosions it's very stable. That said I'm not saying that it doesn't drop at certain times.) Hands down confident that a 970 and a i5 2500K with some overclocking (if needed at all) will run this at 60fps or more @ 1080p.