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Two tidbits that may be of interest:

 

Hot Chips 2017: We'll See PCIe 4.0 This Year, PCIe 5.0 In 2019
http://www.tomshardware.com/news/pcie-4.0-5.0-pci-sig-specfication,35325.html
The industry needs PCIe 4.0 to land soon, and PCI-SIG assures us it will ratify the new specification by the end of 2017. The sluggish ratification process hasn't hampered adoption entirely, though. Several IP vendors already offer 16GT/s controllers, and many vendors have already implemented PCIe 4.0 PHYs into their next-generation products. These companies are plowing ahead with the 0.9 revision of the specification, whereas the final ratified spec debuts at 1.0.

PCI-SIG says it is accelerating the development and feedback processes, along with simplifying early specification revisions, in a bid to reduce time to market for future specifications.

PCI-SIG indicates that PCIe 4.0 will be a short-lived specification because the organization has fast-tracked PCIe 5.0 for final release in 2019.

 

PCIe bandwidth is not that important anymore for graphic cards, but it will mean faster storage solutions.

 

AMD Radeon RX Vega 56 gets faster with Vega 64 BIOS
https://videocardz.com/72299/amd-radeon-rx-vega-56-gets-faster-with-vega-64-bios
(also reported at Guru3D and TechPowerUp)
A member of Chiphell forums has finally tested whether RX Vega 56 can be unlocked into full-fat RX Vega 64. Well, it can’t (at least according to GPU-Z), but this mod brings some interesting results.

Although it was expected, the sample used by KDtree did not unlock to full 4096-core Vega. This means that flashing 64 BIOS into 56 will not give you any extra boost thanks to more cores. However, the BIOS will change clock speeds which apparently have a much greater effect on the performance.

The RX Vega 64 BIOS has 1545 MHz boost clock and 945 MHz HBM2 clock. The RX Vega 56 is slower with boost clock at 1471 MHz and memory clock at 800 MHz. The BIOS mod gives you the same clocks on your 56, which practically improves performance.

By increasing the frequency by 75 MHz the modder noticed that the card was only 2% slower than reference RX Vega 64.

Furthermore, it was proven that overclocked RX Vega 56 at 1650 MHz (core) 2200 MHz (memory) actually surpasses 64 at default clocks.

If those results are correct then RX Vega 56 may become even more popular thanks to this simple mod. Of course, such modifications will void your warranty, but since the RX Vega series have two BIOSes, this mod is almost fool-proof.

 

No word about power cunsumption or temps, tho.