You need a lot of GPU to produce two different images at 90 FPS. If 60 FPS look OK to you on a normal monitor, multiply by 2 for the stereoscopic vision and by

You need a lot of GPU to produce two different images at 90 FPS. If 60 FPS look OK to you on a normal monitor, multiply by 2 for the stereoscopic vision and by 1.5 for the higher frame rate, for a total factor 3. That's how much more powerful your GPU needs to be in order to handle the same scene in VR, at the same load level. At this time, very few people have (or would be willing to buy) systems that powerful.