AMD Instinct MI355X vs AMD Ryzen Z2 A GPU Comparison

AMD Instinct MI355X and AMD Ryzen Z2 A GPU occupy opposite ends of the AMD graphics spectrum, with the former built for massive compute workloads and the latter designed for low-power, portable gaming systems. The database shows no direct head-to-head benchmark results between these two parts, so the analysis relies on their recorded specifications, architectural differences, and respective performance percentiles. The MI355X sits in the 50th percentile of all GPUs, while the Ryzen Z2 A GPU also sits in the 50th percentile, indicating that both parts occupy a middle-ground position in the overall distribution of recorded graphics hardware, albeit for completely different reasons and market segments.

Where Each One Wins

The AMD Instinct MI355X is the clear winner in any compute-heavy, high-throughput scenario. Its FP32 performance of 78.64 TFLOPS is nearly 48 times higher than the Ryzen Z2 A GPU's 1.638 TFLOPS, and its FP16 output of 78.64 TFLOPS (1:1 ratio) dwarfs the Z2 A's 3.277 TFLOPS (2:1 ratio). The MI355X also dominates in texture throughput with 2,457.6 GTexel/s versus the Z2 A's 51.20 GTexel/s, a difference of roughly 48 times. The 288 GB of HBM3e memory with 8.19 TB/s of bandwidth is an order of magnitude beyond the 16 GB LPDDR5 pool at 102.4 GB/s, making the MI355X the only choice for large-scale AI training, scientific simulation, or high-performance computing tasks where memory capacity and bandwidth are the primary constraints.

The AMD Ryzen Z2 A GPU wins in every efficiency-oriented and consumer-facing metric. Its 15 W TDP is a fraction of the MI355X's 1400 W requirement, making it suitable for handheld consoles and portable devices. The Z2 A supports a full suite of modern graphics APIs, including DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the MI355X reports N/A for all three APIs, confirming its role as a compute accelerator without display outputs. The Z2 A has a display output (1x USB Type-C) and a pixel rate of 25.60 GPixel/s, whereas the MI355X has no display outputs and a pixel rate of 0 MPixel/s. For gaming, the Z2 A's 8 ray tracing cores provide hardware-accelerated ray tracing, a feature entirely absent from the MI355X. The Z2 A also uses a 7 nm process with a modest 163 mm² die size, while the MI355X uses a 3 nm process but packs a massive 2380 mm² die, which affects manufacturing complexity and thermal management.

Architecture Differences

The architectural divide between these two GPUs is substantial. The MI355X is built on CDNA 4.0, an architecture specifically designed for compute and AI workloads, while the Z2 A uses RDNA 2.0, a graphics-focused architecture with ray tracing support. The MI355X uses the MI350 256CU chip, which contains 185,000 million transistors on a 2380 mm² die, resulting in a transistor density of 77.7M per mm². The Z2 A uses the Van Gogh chip, with only 2,400 million transistors on a 163 mm² die, giving a density of 14.7M per mm². This nearly 77-fold difference in transistor count reflects the MI355X's purpose as a data center accelerator with massive parallel compute resources, while the Z2 A is optimized for low power draw and portability.

The memory subsystems are fundamentally different. The MI355X uses HBM3e memory with a 8192-bit bus width and 8.19 TB/s bandwidth, while the Z2 A uses LPDDR5 with a 128-bit bus and 102.4 GB/s bandwidth. The MI355X's memory clock is 2000 MHz (8 Gbps effective), while the Z2 A's memory clock is 800 MHz (6.4 Gbps effective). The MI355X has 16,384 shading units, 1,024 texture mapping units, and zero ROPs, while the Z2 A has 512 shading units, 32 TMUs, and 16 ROPs. This means the MI355X cannot output pixels at all, while the Z2 A handles rasterization with its 25.60 GPixel/s pixel rate. The MI355X has no RT cores, while the Z2 A includes 8 RT cores, further confirming the MI355X's compute-only orientation.

FAQ

Q: Which GPU has higher FP32 performance?

A: The AMD Instinct MI355X delivers 78.64 TFLOPS in FP32, while the AMD Ryzen Z2 A GPU delivers 1.638 TFLOPS. The MI355X is roughly 48 times faster in single-precision floating-point compute.

Q: Can the MI355X be used for gaming?

A: No. The MI355X has no display outputs, a pixel rate of 0 MPixel/s, and no DirectX, OpenGL, or Vulkan API support. The Ryzen Z2 A GPU, in contrast, supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, and includes a USB Type-C display output.

Q: What are the memory capacities of these two GPUs?

A: The MI355X has 288 GB of HBM3e memory with a 8192-bit bus and 8.19 TB/s bandwidth. The Ryzen Z2 A GPU has 16 GB of LPDDR5 memory with a 128-bit bus and 102.4 GB/s bandwidth.

Q: Which GPU has ray tracing support?

A: The Ryzen Z2 A GPU includes 8 ray tracing cores. The MI355X has no ray tracing cores listed in the database.

Q: What is the process node difference?

A: The MI355X is manufactured on a 3 nm process at TSMC, while the Ryzen Z2 A GPU uses a 7 nm process at TSMC. The MI355X has a transistor density of 77.7M per mm², compared to 14.7M per mm² for the Z2 A.

Q: What is the TDP of each GPU?

A: The MI355X has a TDP of 1400 W with a suggested PSU of 1800 W. The Ryzen Z2 A GPU has a TDP of 15 W, which is approximately 1.1% of the MI355X's power draw.

Specification Differences

The two GPUs differ across nearly every recorded specification field. The MI355X uses the MI350 256CU chip on CDNA 4.0 architecture, while the Z2 A uses the Van Gogh chip on RDNA 2.0. The process node is 3 nm for the MI355X versus 7 nm for the Z2 A. Transistor count is 185,000 million versus 2,400 million, and die size is 2380 mm² versus 163 mm². The boost clock is 2400 MHz for the MI355X and 1600 MHz for the Z2 A, while the base clock is 1000 MHz for both. Memory sizes are 288 GB versus 16 GB, types are HBM3e versus LPDDR5, bus widths are 8192-bit versus 128-bit, and bandwidths are 8.19 TB/s versus 102.4 GB/s. Shading units are 16,384 versus 512, TMUs are 1,024 versus 32, and ROPs are 0 versus 16. The MI355X has no RT cores, while the Z2 A has 8. Pixel rates are 0 MPixel/s versus 25.60 GPixel/s, and texture rates are 2,457.6 GTexel/s versus 51.20 GTexel/s. FP32 performance is 78.64 TFLOPS versus 1.638 TFLOPS, and FP16 is 78.64 TFLOPS (1:1) versus 3.277 TFLOPS (2:1). TDP is 1400 W versus 15 W. The MI355X uses an OAM Module slot with no power connectors and no display outputs, while the Z2 A has a USB Type-C display output. The MI355X uses PCIe 5.0 x16, while the Z2 A has no bus interface listed. The MI355X has no API support, while the Z2 A supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The MI355X dimensions are 102 mm length and 165 mm width, while the Z2 A has no dimensions recorded. The MI355X released on June 11, 2025, while the Z2 A released on December 31, 2024.

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark entries for these two GPUs, so the comparison is drawn from the recorded specification data rather than measured performance tests. The most significant gap appears in FP32 compute: the MI355X's 78.64 TFLOPS is exactly 48 times the Z2 A's 1.638 TFLOPS. In FP16, the MI355X's 78.64 TFLOPS (1:1) is 24 times the Z2 A's 3.277 TFLOPS (2:1). Texture rate shows a similar 48-fold difference, with the MI355X at 2,457.6 GTexel/s versus the Z2 A's 51.20 GTexel/s. Memory bandwidth is 80 times higher on the MI355X (8.19 TB/s versus 102.4 GB/s), and memory capacity is 18 times higher (288 GB versus 16 GB). The MI355X also leads in shading units (16,384 versus 512, a 32-fold difference) and TMUs (1,024 versus 32, a 32-fold difference).

The Z2 A wins in the categories that matter for consumer graphics output. Its pixel rate of 25.60 GPixel/s is meaningful for display output, while the MI355X produces 0 MPixel/s. The Z2 A's 8 RT cores provide hardware ray tracing, which the MI355X lacks entirely. The Z2 A's API support (DirectX 12 Ultimate, OpenGL 4.6, Vulkan 1.4) contrasts with the MI355X's N/A entries across all APIs. Power efficiency heavily favors the Z2 A, with a 15 W TDP versus the MI355X's 1400 W TDP, a 93.3-fold difference. The Z2 A's 7 nm process and smaller die (163 mm² versus 2380 mm²) indicate a far more power-conscious design, while the MI355X's 3 nm process and massive die size target maximum throughput at the cost of power and size.

The Verdict

The data points to two entirely different product categories. The AMD Instinct MI355X is a data center compute accelerator with 78.64 TFLOPS FP32 performance, 288 GB of HBM3e memory, and 8.19 TB/s of bandwidth, configured as an OAM module with no display outputs and no consumer API support. It requires a 1400 W TDP and an 1800 W suggested PSU, making it suitable only for server racks with dedicated power and cooling infrastructure. The AMD Ryzen Z2 A GPU is a low-power console GPU with 1.638 TFLOPS FP32, 16 GB LPDDR5 memory, 102.4 GB/s bandwidth, and full support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, plus 8 ray tracing cores. Its 15 W TDP and USB Type-C display output make it appropriate for handheld gaming devices where power draw and physical size are critical constraints.

Benchmark results indicate that any workload requiring high compute throughput, large memory capacity, or extreme memory bandwidth belongs to the MI355X. Any workload requiring graphics output, ray tracing, or API compatibility belongs to the Z2 A. The MI355X's 48-fold advantage in FP32 and texture rate, along with an 80-fold advantage in memory bandwidth, makes it the only viable option for AI training, scientific computing, or large-scale data processing. The Z2 A's 93.3-fold advantage in power efficiency and its ray tracing capability make it the only viable option for portable gaming systems. Users selecting between these two parts will choose based on the application domain: data center compute versus consumer graphics, with no overlap in their respective capabilities.