Why system requirements for VR is so big?

InDigital

InDigital
Do they have uber 2x 4k resolutions?
Because, for example Radeon R9 290 can simply play 4K games on Ultra without any problems.
 

happyfunball

happyfunball
Rift specific blog, but general concept applies: https://www.oculus.com/en-us/blog/powering-the-rift/

Specifically:

At the same time, there are three key VR graphics challenges to note: raw rendering costs, real-time performance, and latency.

On the raw rendering costs: a traditional 1080p game at 60Hz requires 124 million shaded pixels per second. In contrast, the Rift runs at 2160×1200 at 90Hz split over dual displays, consuming 233 million pixels per second. At the default eye-target scale, the Rift’s rendering requirements go much higher: around 400 million shaded pixels per second. This means that by raw rendering costs alone, a VR game will require approximately 3x the GPU power of 1080p rendering.

Traditionally, PC 3D graphics has had soft real-time requirements, where maintaining 30-60 FPS has been adequate. VR turns graphics into more of a hard real-time problem, as each missed frame is visible. Continuously missing framerate is a jarring, uncomfortable experience. As a result, GPU headroom becomes critical in absorbing unexpected system or content performance potholes.

Finally, we know that minimizing motion-to-photon latency is key to a great VR experience. However, the last few decades of GPU advancements have been built around systems with deep pipelining to achieve maximum throughput at the cost of increased latency; not exactly what we want for VR. Today, minimizing latency comes at the cost of some GPU performance.
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