https://arstechnica.com/gadgets/2021/09/new-drivers-add-performance-boosting-memory-access-feature-to-older-amd-gpus/

GPU driver releases normally aren't very newsworthy; they usually fix bugs, boost performance in some games, and add support for new GPUs. But owners of last-generation AMD Radeon RX 5000-series graphics cards should take note of today's Adrenalin 21.9.1 release. This update adds support for AMD's "Smart Access Memory" (SAM) feature for older GPUs. AMD says the feature can improve game performance by up to 15 percent in some games.

SAM support was previously restricted to the Radeon RX 6800 series (and Nvidia's GeForce RTX 3000 series, which support a mostly identical feature that Nvidia calls Resizable BAR). In addition to the right GPU and the right drivers, you'll also need to be running a supported processor on a supported chipset: either a 10th- or 11th-generation Intel Core CPU in a 400- or 500-series motherboard or a Ryzen 3000 or 5000-series CPU in a 400- or 500-series motherboard.