AMD Radeon Instinct MI308X vs AMD Ryzen Z2 GPU Comparison

FAQ

Q: What are the architectural generations of the AMD Radeon Instinct MI308X and the AMD Ryzen Z2 GPU?

A: The AMD Radeon Instinct MI308X uses the CDNA 3.0 architecture with the Aqua Vanjaram chip, while the AMD Ryzen Z2 GPU uses the RDNA 3.0 architecture with the Hawk Point chip. The MI308X belongs to the Radeon Instinct (MIx) generation, whereas the Ryzen Z2 GPU is classified under Console GPU (AMD).

Q: How do the memory subsystems differ between these two GPUs?

A: The MI308X features 192 GB of HBM3 memory on an 8192-bit bus with 10.3 TB/s bandwidth. The Ryzen Z2 GPU has 16 GB of LPDDR5X memory on a 128-bit bus with 119.9 GB/s bandwidth. The memory clock for the MI308X is 2525 MHz (10.1 Gbps effective), while the Ryzen Z2 GPU runs at 937 MHz (7.5 Gbps effective).

Q: What is the difference in transistor count and die size?

A: The MI308X contains 153,000 million transistors on a 1017 mm² die, produced on a 5 nm TSMC process. The Ryzen Z2 GPU contains 25,390 million transistors on a 178 mm² die, produced on a 4 nm TSMC process. Transistor density is 150.4M per mm² for the MI308X and 142.6M per mm² for the Ryzen Z2 GPU.

Q: How do the compute capabilities compare in terms of FP32 and FP16 throughput?

A: The MI308X delivers 81.72 TFLOPS FP32 and 653.7 TFLOPS FP16 (8:1 ratio). The Ryzen Z2 GPU delivers 8.294 TFLOPS FP32 and 8.294 TFLOPS FP16 (1:1 ratio). This makes the MI308X roughly 9.85 times faster in FP32 and about 78.8 times faster in FP16.

Q: What are the power requirements for each GPU?

A: The MI308X has a TDP of 750 W and a suggested PSU of 1150 W. The Ryzen Z2 GPU has a TDP of 28 W and no suggested PSU is listed. The MI308X uses an OAM Module slot width with no power connectors, while the Ryzen Z2 GPU also lists no power connectors.

Q: What display outputs and API support does each GPU provide?

A: The MI308X has no display outputs and lists no DirectX, OpenGL, or Vulkan API support. The Ryzen Z2 GPU has one USB Type-C display output and supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Architecture Differences

The AMD Radeon Instinct MI308X and AMD Ryzen Z2 GPU represent fundamentally different design philosophies within AMD's product stack. The MI308X is built on the CDNA 3.0 architecture, which prioritizes data center compute workloads, while the Ryzen Z2 GPU uses the RDNA 3.0 architecture, which targets graphics rendering and console-style performance.

The process nodes differ: the MI308X uses TSMC's 5 nm process, while the Ryzen Z2 GPU uses TSMC's 4 nm process. Despite the smaller node, the Ryzen Z2 GPU packs far fewer transistors: 25,390 million versus 153,000 million for the MI308X. The die sizes also diverge dramatically, with the MI308X measuring 1017 mm² compared to 178 mm² for the Ryzen Z2 GPU. Transistor density is slightly higher on the MI308X at 150.4M per mm² versus 142.6M per mm² for the Ryzen Z2 GPU.

The shading unit counts show the scale difference: the MI308X has 19,456 shading units, while the Ryzen Z2 GPU has 768. Texture mapping units follow the same pattern: 1,216 on the MI308X versus 48 on the Ryzen Z2 GPU. The MI308X reports zero ROPs and zero pixel rate, which reflects its compute-focused design without traditional rasterization output stages. The Ryzen Z2 GPU has 32 ROPs and a pixel rate of 86.40 GPixel/s.

Ray tracing support also differs. The MI308X lists no ray tracing cores, while the Ryzen Z2 GPU includes 12 RT cores. Neither GPU lists tensor cores. The FP16 processing ratio reveals another architectural distinction: the MI308X uses an 8:1 FP16 to FP32 ratio, indicating dedicated FP16 acceleration, whereas the Ryzen Z2 GPU processes FP16 at a 1:1 ratio with FP32.

Memory architecture is a major differentiator. The MI308X uses HBM3 with a massive 8192-bit bus width, while the Ryzen Z2 GPU uses LPDDR5X with a 128-bit bus. The MI308X also has no display outputs, while the Ryzen Z2 GPU provides one USB Type-C output. API support is absent for the MI308X but fully specified for the Ryzen Z2 GPU, which supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Head-to-Head Benchmarks

The recorded benchmark data for these two GPUs contains no direct head-to-head measurements, and neither GPU has an average benchmark score or wins in the database. Both devices sit at the 50th percentile against all GPUs. The absence of benchmark scores means the comparison must rely on the recorded specification data to establish performance deltas.

The FP32 compute throughput shows the most significant gap. The MI308X delivers 81.72 TFLOPS, which is approximately 9.85 times the 8.294 TFLOPS of the Ryzen Z2 GPU. This ratio indicates that the MI308X can process roughly ten times the single-precision floating-point operations per second, which directly impacts compute-heavy workloads such as scientific simulations and AI training.

FP16 performance amplifies the difference further. The MI308X reaches 653.7 TFLOPS with its 8:1 ratio, while the Ryzen Z2 GPU manages 8.294 TFLOPS. This creates a multiplier of approximately 78.8 times, making the MI308X exceptionally strong for mixed-precision workloads that leverage FP16 acceleration.

Texture rate also favors the MI308X substantially. The MI308X achieves 2,553.6 GTexel/s compared to 129.6 GTexel/s for the Ryzen Z2 GPU, a factor of about 19.7 times. This suggests that texture-heavy rendering tasks would perform far better on the MI308X, assuming the workload can utilize its architecture.

Memory bandwidth tells a similar story. The MI308X provides 10.3 TB/s of bandwidth, which is roughly 85.9 times the 119.9 GB/s of the Ryzen Z2 GPU. This enormous bandwidth advantage comes from the HBM3 memory type and the 8192-bit bus, versus the LPDDR5X memory and 128-bit bus on the Ryzen Z2 GPU.

Pixel rate is the only area where the Ryzen Z2 GPU shows a specification that the MI308X entirely lacks. The MI308X records 0 MPixel/s, while the Ryzen Z2 GPU achieves 86.40 GPixel/s. This reflects the MI308X's lack of ROPs and its role as a compute accelerator rather than a rasterization-focused GPU.

Clock speeds present a mixed picture. The MI308X has a higher base clock at 1000 MHz versus 800 MHz for the Ryzen Z2 GPU. However, the Ryzen Z2 GPU has a higher boost clock at 2700 MHz versus 2100 MHz for the MI308X. The memory clocks show the MI308X at 2525 MHz (10.1 Gbps effective) and the Ryzen Z2 GPU at 937 MHz (7.5 Gbps effective).

Specification Differences

The following fields differ between the AMD Radeon Instinct MI308X and the AMD Ryzen Z2 GPU:

• Architecture: CDNA 3.0 versus RDNA 3.0
• Chip: Aqua Vanjaram versus Hawk Point
• Generation: Radeon Instinct (MIx) versus Console GPU (AMD)
• Process Node: 5 nm versus 4 nm
• Transistors: 153,000 million versus 25,390 million
• Die Size: 1017 mm² versus 178 mm²
• Transistor Density: 150.4M / mm² versus 142.6M / mm²
• Base Clock: 1000 MHz versus 800 MHz
• Boost Clock: 2100 MHz versus 2700 MHz
• Memory Clock: 2525 MHz (10.1 Gbps effective) versus 937 MHz (7.5 Gbps effective)
• Memory Size: 192 GB versus 16 GB
• Memory Type: HBM3 versus LPDDR5X
• Memory Bus Width: 8192 bit versus 128 bit
• Memory Bandwidth: 10.3 TB/s versus 119.9 GB/s
• Shading Units: 19,456 versus 768
• TMUs: 1,216 versus 48
• ROPs: 0 versus 32
• RT Cores: null versus 12
• Pixel Rate: 0 MPixel/s versus 86.40 GPixel/s
• Texture Rate: 2,553.6 GTexel/s versus 129.6 GTexel/s
• FP32: 81.72 TFLOPS versus 8.294 TFLOPS
• FP16: 653.7 TFLOPS (8:1) versus 8.294 TFLOPS (1:1)
• TDP: 750 W versus 28 W
• Slot Width: OAM Module versus null
• Suggested PSU: 1150 W versus null
• Bus Interface: PCIe 5.0 x16 versus null
• Display Outputs: No outputs versus 1x USB Type-C
• DirectX: null versus 12 Ultimate (12_2)
• OpenGL: null versus 4.6
• Vulkan: null versus 1.4
• Production Status: null versus Active
• Release Date: 2023-12-05 versus 2024-12-31
• Predecessor: FirePro Data Center versus null

The Verdict

The data indicates that the AMD Radeon Instinct MI308X and AMD Ryzen Z2 GPU serve entirely different purposes within the AMD lineup. The MI308X is a data center accelerator with massive compute resources, while the Ryzen Z2 GPU is a compact console-oriented graphics processor with display output and full graphics API support.

For compute-intensive workloads, the MI308X is the clear choice based on the recorded specifications. Its FP32 throughput of 81.72 TFLOPS is roughly ten times that of the Ryzen Z2 GPU, and its FP16 throughput of 653.7 TFLOPS is nearly 79 times higher. The memory bandwidth of 10.3 TB/s compared to 119.9 GB/s provides a substantial advantage for memory-bound operations. The 192 GB HBM3 capacity versus 16 GB LPDDR5X also allows for much larger datasets to reside on the GPU.

The Ryzen Z2 GPU offers capabilities that the MI308X does not include. It provides display output through a USB Type-C connection, supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, and includes 12 ray tracing cores. The MI308X has no display outputs and no listed API support, which indicates it is not designed for graphics rendering or interactive workloads.

Power consumption differs by a factor of nearly 27: the MI308X has a TDP of 750 W with a suggested PSU of 1150 W, while the Ryzen Z2 GPU has a TDP of 28 W. This makes the Ryzen Z2 GPU far more suitable for power-constrained environments such as handheld or embedded systems. The MI308X uses an OAM Module slot width, while the Ryzen Z2 GPU does not specify a slot width.

The production status also differs. The Ryzen Z2 GPU is listed as Active, while the MI308X has no production status recorded. The release dates show the MI308X arrived on 2023-12-05, approximately one year before the Ryzen Z2 GPU on 2024-12-31.

Users seeking a high-throughput compute accelerator for data center tasks should select the MI308X based on its overwhelming compute and memory advantages. Users needing a graphics-capable GPU with display output, ray tracing, and modern API support should select the Ryzen Z2 GPU, as the MI308X cannot perform those functions. The database records no head-to-head benchmark wins for either device, so the final choice depends entirely on the workload requirements and the specifications each GPU provides.