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Vive Wireless Adapter and PCIe options


Artem
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I am considering to buy a PCIe adapter for my Vive Pro, but I have limited options of available PCIe slots.

 

  [A] PCIe 3.0 x16 (physical size) with x8 lanes connected to CPU directly

  PCIe 2.0 x1 connected through the chipset

 

Looking through the web, I have some concerns.

 

  1. The official documentation says the adapter supports PCIe x1 or x4. Can it still work in PCIe x16/x8?

  2. I assume the adapter uses PCIe 3.0, which allows 985MB/s. Would it work on the PCIe 2.0 slot that can send only up to 500MB/s? A simple calculation would yield: 2 eyes * 1080*1200 * 4 byte-colors * 90 fps / 1024^2 = 890 MB/s for Vive or 2 eyes * 1440*1600* 4 byte-colors * 90 fps / 1024^2 = 1582 MB/s for Vive Pro, which is even more that PCIe 3.0 allows. Does it mean some compression takes place between the GPU and the WiGig card? In that case, would 500MB/s of PCIe 2.0 be enough for a smooth Vive Pro experience (no worse than with PCIe 3.0?)?

 

Update:

  3. Does the adapter use Intel® Wireless Gigabit 11100 VR? The spec tells it supports 4.7Gbps, which is less than 5Gbps of PCIe 2.0. Does that mean using PCIe 2.0 is completely safe in terms of performance of Vive Pro?

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