Now in Discovery Studio version DS 2021, there are several more protocols that support running on GPU.
You can tell if a protocol can run on GPU by checking if the protocol has a parameter called Platform which can be set on the option of CPU or GPU.
GPU computing will require a NVIDIA CUDA-capable video card and the appropriate driver. For detailed information please refer to the Discovery Studio System Requirements documentation at https://www.3ds.com/fileadmin/PRODUCTS-SERVICES/BIOVIA/PDF/biovia-system-requirements-discovery-studio-2021.pdf where the GPU Requirements section has a table of GPU-enabled protocols, the CUDA version, and list of graphics cards and drivers information for running on GPU.