was difficult to get a real-world performance boost from and thus AMD never enabled it. Primitive shaders in RDNA are compiler-controlled. The display controller in RDNA has been updated to support Display Stream Compression 1.2a, allowing output in 4K@240 Hz, HDR 4K@120 Hz, and HDR 8K@60 Hz. Instruction set AMD's GPUOpen website hosts a PDF document aiming to describe the environment, the organization and the program state of RDNA devices. It details the instruction set and the microcode formats native to this family of processors that are accessible to programmers and compilers. Differences between GCN and RDNA There are architectural changes which affect how code is scheduled: Single cycle instruction issue: GCN issued one instruction per wave once every 4 cycles. RDNA issues instructions every cycle. Wave32: GCN used a wavefront size of 64 threads (work items). RDNA supports both wavefront sizes of 32 and 64 threads. Workgroup Processors: GCN grouped the shader hardware into "compute units" (CUs) which contained scalar ALUs and vector ALUs, LDS and memory access. One CU contains 4 SIMD16s which share one path to memory. RDNA introduced the "workgroup processor" ("WGP"). The WGP replaces the compute unit as the basic unit of shader computation hardware/computing. One WGP encompasses 2 CUs. This allows significantly more compute power and memory bandwidth to be directed at a single workgroup. In RDNA, 1 CU is one half of a WGP. Chips discrete GPUs: Navi 10 found on Radeon RX 5600, Radeon RX 5600 XT, Radeon RX 5600M, Radeon RX 5700, Radeon RX 5700M, Radeon RX 5700 XT, Radeon Pro 5700, Radeon Pro 5700 XT, Radeon Pro W5700X, and Radeon Pro W5700 graphics cards Navi 12 found on Radeon Pro V520 branded graphics card, Radeon Pro 5600M branded mobile graphics card and BC-160 mining card for cryptocurrency Navi 14 found on Radeon RX 5300, Radeon RX 5300 XT, Radeon Pro 5300, Radeon Pro W5300, Radeon RX 5500, Radeon RX 5500 XT, Radeon Pro 5500, Radeon Pro 5500 XT, and Radeon Pro W5500, branded graphics cards; Radeon RX 5300M, Radeon Pro 5300M, Radeon Pro W5300M, Radeon RX 5500M, Radeon Pro 5500M, and Radeon Pro W5500M branded mobile graphics cards RDNA 2 RDNA 2 (also RDNA2) is the successor to the RDNA microarchitecture. It was first publicly announced in early 2020 with a projected release in Q4 2020. According to statements from AMD, RDNA 2 would be a "refresh" of the RDNA