I know in FFXIV 1.0 Nvidia and Intel were SE's partners. Notice that AMD CPUs are not even listed at all. I seriously doubt SE didn't much testing with AMD GPUs yet. SE probably needs to figure out the equivalent AMD GPU to the GeForce GTX 550 Ti for their new engine.
Remember to read this line:
"* Please note that these requirements may change for the final release version"
Looks like these requirements were thrown together quickly so I'm positive they will change.
