AMD Instinct MI355X vs AMD Ryzen Z2 GPU Comparison

FAQ

Q: What are the two GPUs compared in this database entry?

A: The two GPUs are the AMD Instinct MI355X, an accelerator based on the CDNA 4.0 architecture with the MI350 256CU chip, and the AMD Ryzen Z2 GPU, a console-class graphics processor based on RDNA 3.0 with the Hawk Point chip.

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

A: The Instinct MI355X uses 288 GB of HBM3e memory on an 8192-bit bus, delivering 8.19 TB/s of bandwidth. The Ryzen Z2 GPU uses 16 GB of LPDDR5X memory on a 128-bit bus, delivering 119.9 GB/s of bandwidth.

Q: What are the thermal design power ratings for each?

A: The Instinct MI355X has a TDP of 1400 W with a suggested PSU of 1800 W and is an OAM Module. The Ryzen Z2 GPU has a TDP of 28 W and has no suggested PSU listed in the database.

Q: Which GPU has a higher boost clock?

A: The Ryzen Z2 GPU has a boost clock of 2700 MHz, while the Instinct MI355X has a boost clock of 2400 MHz. The Instinct MI355X has a higher base clock at 1000 MHz versus 800 MHz for the Ryzen Z2 GPU.

Q: What are the API support differences?

A: The Ryzen Z2 GPU supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The Instinct MI355X lists N/A for DirectX, OpenGL, and Vulkan, indicating no consumer graphics API support.

Q: Which GPU has more shading units and TMUs?

A: The Instinct MI355X has 16,384 shading units and 1,024 TMUs. The Ryzen Z2 GPU has 768 shading units and 48 TMUs. The Instinct MI355X also reports 0 ROPs and 0 MPixel/s pixel rate, while the Ryzen Z2 GPU has 32 ROPs and a pixel rate of 86.40 GPixel/s.

Architecture Differences

The AMD Instinct MI355X and the AMD Ryzen Z2 GPU occupy fundamentally different positions in the product stack, and the architectural data confirms this divergence. The Instinct MI355X is built on the CDNA 4.0 architecture, which is designed for compute acceleration rather than traditional graphics rendering. It uses the MI350 256CU chip, manufactured on a 3 nm process at TSMC, with 185,000 million transistors on a 2380 mm² die. The transistor density works out to 77.7M per mm². This is a massive, power-hungry accelerator intended for data center workloads.

The Ryzen Z2 GPU, in contrast, uses the RDNA 3.0 architecture, a graphics-focused design. Its Hawk Point chip is manufactured on a 4 nm process at TSMC, with 25,390 million transistors on a 178 mm² die, giving a transistor density of 142.6M per mm². The smaller, denser chip is optimized for power efficiency and consumer graphics tasks. The Ryzen Z2 GPU has 768 shading units, 48 TMUs, 32 ROPs, and 12 RT cores, while the Instinct MI355X has 16,384 shading units, 1,024 TMUs, 0 ROPs, and no listed RT cores. The absence of ROPs and the N/A graphics API entries for the Instinct MI355X indicate it is not designed for display output or conventional gaming workloads.

The memory architecture also reflects the different design goals. The Instinct MI355X uses 288 GB of HBM3e memory with a 8192-bit bus and 8.19 TB/s bandwidth, while the Ryzen Z2 GPU uses 16 GB of LPDDR5X memory with a 128-bit bus and 119.9 GB/s bandwidth. The clock behavior differs as well: the Instinct MI355X runs at a base of 1000 MHz and boosts to 2400 MHz, while the Ryzen Z2 GPU has a lower base of 800 MHz but a higher boost of 2700 MHz. The Ryzen Z2 GPU also lists a display output of 1x USB Type-C, whereas the Instinct MI355X has no outputs.

The power envelopes are vastly different. The Instinct MI355X carries a TDP of 1400 W and a suggested PSU of 1800 W, while the Ryzen Z2 GPU consumes just 28 W. The process nodes, transistor counts, and memory types all point to two products built for separate markets: one for maximum compute throughput and one for integrated mobile or console-style graphics.

Head-to-Head Benchmarks

The database records no head-to-head benchmark results for these two GPUs and no individual benchmark scores for either product. The average benchmark score is 0 for both, and the percentile versus all GPUs is 50 for each. With no measured data available, the comparison must rely on the recorded specifications and architectural characteristics.

The raw compute numbers show a clear separation. The Instinct MI355X delivers 78.64 TFLOPS of FP32 performance and 78.64 TFLOPS of FP16 performance at a 1:1 ratio. The Ryzen Z2 GPU delivers 8.294 TFLOPS of FP32 and 8.294 TFLOPS of FP16, also at 1:1. The Instinct MI355X is therefore roughly 9.5 times higher in raw floating-point throughput based on these figures. In terms of texture rate, the Instinct MI355X reaches 2,457.6 GTexel/s, while the Ryzen Z2 GPU reaches 129.6 GTexel/s.

The pixel rate tells a different story. The Instinct MI355X reports 0 MPixel/s, while the Ryzen Z2 GPU reports 86.40 GPixel/s. This indicates that the Ryzen Z2 GPU has a functional rasterization pipeline, whereas the Instinct MI355X does not process pixels in the conventional sense. The memory bandwidth gap is also substantial: 8.19 TB/s for the Instinct MI355X versus 119.9 GB/s for the Ryzen Z2 GPU, a difference of roughly 68 times.

The absence of benchmark data means the database cannot provide relative performance scores, win counts, or nearest rival comparisons. The wins fields are 0 for both GPUs. The recorded measurements are limited to clock speeds, memory specifications, and compute throughput figures. These figures indicate that the Instinct MI355X is designed for compute-heavy tasks such as AI training or scientific simulation, while the Ryzen Z2 GPU is suited to rendering and graphics output. The 1400 W TDP of the Instinct MI355X versus the 28 W TDP of the Ryzen Z2 GPU further emphasizes the different performance ceilings and deployment contexts.

The Verdict

The data supports a straightforward conclusion: the AMD Instinct MI355X and the AMD Ryzen Z2 GPU are not direct competitors and should be selected based on entirely different workload requirements. The Instinct MI355X is a high-power, compute-oriented accelerator with 78.64 TFLOPS of FP32 throughput, 288 GB of HBM3e memory, and 8.19 TB/s of bandwidth. It has no display outputs and no graphics API support, so it is not suitable for rendering or interactive graphics. The Ryzen Z2 GPU, with 8.294 TFLOPS of FP32 throughput, 16 GB of LPDDR5X memory, and 119.9 GB/s of bandwidth, is a low-power graphics processor with DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 support.

Users who need massive memory capacity, extremely high memory bandwidth, and peak floating-point compute should consider the Instinct MI355X. Its 1400 W TDP and OAM Module form factor indicate a data center or server environment. Users who need a compact, efficient GPU with graphics output and consumer API support should consider the Ryzen Z2 GPU. Its 28 W TDP and 1x USB Type-C output make it suitable for mobile or embedded systems. The transistor density figures also differ: the Ryzen Z2 GPU packs 142.6M transistors per mm², while the Instinct MI355X has 77.7M per mm², reflecting the denser integration of the smaller chip.

The lack of benchmark scores and rival comparisons in the database means there is no empirical performance data to rank these GPUs against other products. The specification sheets are the only recorded evidence. Based on that evidence, the Instinct MI355X dominates in compute throughput, memory size, and memory bandwidth, while the Ryzen Z2 GPU dominates in pixel rate, graphics API support, and power efficiency. Neither product is a substitute for the other.

Specification Differences

The two GPUs differ across nearly every recorded specification field. The chip names are MI350 256CU for the Instinct MI355X and Hawk Point for the Ryzen Z2 GPU. The architectures are CDNA 4.0 and RDNA 3.0, respectively. The process nodes are 3 nm for the Instinct MI355X and 4 nm for the Ryzen Z2 GPU. Both are manufactured by TSMC, but the transistor counts are 185,000 million versus 25,390 million. The die sizes are 2380 mm² versus 178 mm², and the transistor densities are 77.7M per mm² versus 142.6M per mm².

Clock speeds differ: base clocks are 1000 MHz for the Instinct MI355X and 800 MHz for the Ryzen Z2 GPU, while boost clocks are 2400 MHz and 2700 MHz. Memory clocks are 2000 MHz (8 Gbps effective) for the Instinct MI355X and 937 MHz (7.5 Gbps effective) for the Ryzen Z2 GPU. Memory sizes are 288 GB versus 16 GB, types are HBM3e versus LPDDR5X, bus widths are 8192 bit versus 128 bit, and bandwidths are 8.19 TB/s versus 119.9 GB/s.

Shading units are 16,384 versus 768, TMUs are 1,024 versus 48, and ROPs are 0 versus 32. The Ryzen Z2 GPU has 12 RT cores, while the Instinct MI355X has none listed. Pixel rates are 0 MPixel/s versus 86.40 GPixel/s, and texture rates are 2,457.6 GTexel/s versus 129.6 GTexel/s. FP32 and FP16 are both 78.64 TFLOPS for the Instinct MI355X and 8.294 TFLOPS for the Ryzen Z2 GPU.

TDP is 1400 W for the Instinct MI355X and 28 W for the Ryzen Z2 GPU. The Instinct MI355X is an OAM Module with no power connectors and a suggested PSU of 1800 W, while the Ryzen Z2 GPU has no slot width, no power connectors, and no suggested PSU. The bus interface is PCIe 5.0 x16 for the Instinct MI355X and not listed for the Ryzen Z2 GPU. Display outputs are none for the Instinct MI355X and 1x USB Type-C for the Ryzen Z2 GPU. API support is N/A for the Instinct MI355X and DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4 for the Ryzen Z2 GPU. Dimensions are 102 mm by 165 mm for the Instinct MI355X, with no dimensions listed for the Ryzen Z2 GPU. Release dates are 2025-06-11 for the Instinct MI355X and 2024-12-31 for the Ryzen Z2 GPU. The Instinct MI355X has a predecessor listed as Radeon Instinct, while the Ryzen Z2 GPU has none. Production status is active for the Ryzen Z2 GPU and not listed for the Instinct MI355X.

Where Each One Wins

The Instinct MI355X wins in every compute and memory capacity metric. Its FP32 throughput of 78.64 TFLOPS is 9.5 times higher than the 8.294 TFLOPS of the Ryzen Z2 GPU. Its memory bandwidth of 8.19 TB/s is roughly 68 times higher than 119.9 GB/s. Its memory capacity of 288 GB is 18 times higher than 16 GB. Its texture rate of 2,457.6 GTexel/s is nearly 19 times higher than 129.6 GTexel/s. These figures make it the clear choice for workloads that depend on massive parallel computation and large data sets, such as AI model training, high-performance computing, and scientific simulation.

The Ryzen Z2 GPU wins in areas related to graphics output and power efficiency. Its pixel rate of 86.40 GPixel/s is functional, while the Instinct MI355X reports 0 MPixel/s. It supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the Instinct MI355X lists N/A for all three. Its TDP of 28 W is 50 times lower than the 1400 W of the Instinct MI355X. Its boost clock of 2700 MHz is higher than the 2400 MHz of the Instinct MI355X. Its transistor density of 142.6M per mm² is higher than 77.7M per mm². It also has 32 ROPs and 12 RT cores, which the Instinct MI355X lacks. These characteristics suit it for rendering, gaming, and integrated graphics applications where power draw and display output matter.

The release dates place the Ryzen Z2 GPU earlier at 2024-12-31, while the Instinct MI355X arrived on 2025-06-11. The production status is active for the Ryzen Z2 GPU, while the Instinct MI355X has no recorded status. The data shows two specialized tools: one for raw compute density and one for efficient graphics processing. Each wins in its respective domain.