content: As the blog post at https://www.oculus.com/blog/powering-the-rift/ explains, the recommended render target size (that is, the size of the un-distorted image) for a 2160x1200 resolution is about 1.7x larger than the actual display resolution, and you want solid 90 fps. It's pretty clear that both the Rift and Vive are going to be 1080x1200 per eye displays.