While the bandwidth provided by PCIe 3.0 is found to be sufficient for most GPUs with adequate VRAM, the 4GB Radeon RX 5500 XT is found to be struggling possibly due to its PCIe x8 limitation.
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Nvidia has been ruling the mobile GPU landscape for a while and it looks like Team Green wants to continue its domination. The company is reportedly preparing mobile versions of its SUPER GPUs.
On the same day that AMD unveiled its new RX 5500 series graphics cards, it has also pushed out the Radeon Software Adrenalin 2019 Edition 19.10.1 driver bringing support for them as well as GRID.