The DCS feature was discovered in a recent Linux patch and it looks like it is designed specifically for laptop GPUs, even though it is supported on the high-end RX 6800 series, as well as the upcoming RX 6700 mid-range models. DCS reduces power consumption by turning the core off when thermal and power limits are exceeded.
https://www.notebookcheck.net/Linux-patch-reveals-AMD-s-RDNA2-GPUs-support-Duty-Cycle-Scaling-power-management-feature-for-ultraportable-devices.517409.0.html