I have tagged this thread where I uploaded two articles that explains what "Limited Support" means by AMD concerning the Polaris & Vega (RX 400, 500, 600, & Vega GPUs): https://community.amd.com/t5/pc-drivers-software/rx580-24-8-1-driver-automatically-downgrades-to-24-...
Part of the article in the above link:
. In recent weeks the company dropped support for those GPU architectures in their open source Vulkan Linux driver, AMDVLK, and now we have confirmation that the company is slowly winding down support for these architectures in their Windows drivers as well.
Under AMD’s extended driver support schedule for Polaris and Vega, the drivers for these architectures will no longer be kept at feature parity with the RDNA architectures. And while AMD will continue to support Polaris and Vega for some time to come, that support is being reduced to security updates and “functionality updates as available.”
For AMD users keeping a close eye on their driver releases, they’ll likely recognize that AMD already began this process back in September – though AMD hasn’t officially documented the change until now. As of AMD’s September Adrenaline 23.9 driver series, AMD split up the RDNA and GCN driver packages, and with that they have also split the driver branches between the two architectures. As a result, only RDNA cards are receiving new features and updates as part of AMD’s mainline driver branch (currently 23.20), while the GCN cards have been parked on a maintenance driver branch – 23.19.
At present, AMD has not published anything about this change in driver support to their website. But, responding to a request for a comment on Windows driver support from AnandTech, the company provided the following statement:
The AMD Polaris and Vega graphics architectures are mature, stable and performant and don’t benefit as much from regular software tuning. Going forward, AMD is providing critical updates for Polaris- and Vega-based products via a separate driver package, including important security and functionality updates as available. The committed support is greater than for products AMD categorizes as legacy, and gamers can still enjoy their favorite games on Polaris and Vega-based products.