AMD plans to structure its upcoming RDNA 5 graphics architecture around four primary GPU models designated AT0, AT2, AT3, and AT4, according to a report by diit.cz. The lineup excludes a hypothetical fifth model, AT1, which was reportedly canceled before public details emerged about the generation.
AT4 and AT3 use mobile memory standards
The smallest processor in the architecture, AT4, is designed for standalone deployment as well as serving as a graphics chiplet for the upcoming Zen 6 APU generation codenamed Medusa. diit.cz reported that AT3 is a larger processor destined for both standalone graphics cards and the larger Medusa Halo APUs. Both models utilize mobile memory standards such as LPDDR5x, with potential partial support for LPDDR6, rather than traditional GDDR6 or GDDR7 memory.
AT2 targets midrange markets with GDDR7 memory
Positioned as the successor to the Radeon RX 9070 XT, the AT2 GPU targets the higher mainstream and midrange market segments. The processor will likely be the first in AMD’s portfolio to adopt GDDR7 memory and may also function as a chiplet inside gaming consoles. For standalone graphics cards, AT2 remains a monolithic solution built from a single piece of silicon, though it acts as a chiplet when integrated into APU packages.
AT0 high-end interposer architecture
The flagship AT0 high-end and professional segment GPU departs from traditional monolithic manufacturing on the 3nm process. AMD opted for a multi-die design similar to the Instinct MI455X AI accelerator. The processor relies on an Active Interposer Die, also referred to as a Fabric Cache Die, which houses additional chiplets while integrating the L2 cache, memory interface, and memory controller.
A pair of Shader Engine Die silicon blocks containing the graphics compute units sit atop this base, alongside a smaller Media Interface Die. The Media Interface Die handles the display pipeline, connections for HDMI and DisplayPort, and system communication via PCIe. Unlike the Instinct accelerators, AT0 omits HBM memory in favor of GDDR7 chips placed directly on the graphics card’s printed circuit board.
Market release schedule for RDNA 5 hardware
Current industry projections place the market rollout for RDNA 5 hardware across multiple years. Only the AT2 GPU is expected to reach the graphics card market in 2027, while the AT4, AT3, and AT0 models are scheduled to arrive in 2028.
What memory types and GPU models are expected?
What memory types do AT4 and AT3 processors support?
Both models rely on mobile memory standards, specifically LPDDR5x, with possible partial support for LPDDR6 instead of GDDR6 or GDDR7.
Which GPU model is expected to launch first?
The AT2 processor is projected to arrive on the market in 2027 as the sole RDNA 5 graphics card offering that year.
How is the AT0 high-end GPU constructed?
The AT0 processor uses a silicon base that carries a pair of Shader Engine Die blocks and a Media Interface Die, echoing the multi-die architecture of AMD’s Instinct MI455X accelerators.
Worth a look