According to this thread:

http://www.tomshardware.co.uk/answers/id-3180987/ps4-pro-equ...

The GPU in the PS4 pro will be the RX480 desktop-equivalent graphics card. This has a slight lower passmark than the Nvidia GTX 970, which is the minimum spec for the HTC Vive.

Of course, it's not like and like - you can't just compare cards like that, and Playstation have the advantage of controlling the hardware and software configurations (which has always been an advantage for consoles), but saying it easily has the resolution and framerate sounds suspect - I expect it will just about have the resolution and framerate.

I'll find out in a week - I'm going to the Playstation Future of Gaming Tour, and I'll be able to compare it to the Vive with a 970.

The PSVR also has lower resolution, so that level of power goes further than it would with the Vive.

I thought the resolution was also tied to motion sickness, but I could be wrong.

I've noticed on benchmarks that the relationship between resolution and framerate is exponential - so a lower resolution will go a long way to a higher framerate.

The PSVR also specs 120 fps (and is capable of it), whereas Oculus and the Vive are at 90.

On average the AMD cards have better DirectX 12 performance. This could make them more future proof.