AMD Instinct MI455X vs AMD Ryzen Z2 Go GPU Comparison

Head-to-Head Benchmarks

The recorded database contains no direct head-to-head benchmark results for the AMD Instinct MI455X and the AMD Ryzen Z2 Go GPU. Both entries have an empty benchmark array, an average benchmark score of zero, and a percentile ranking of 50 against all GPUs. The wins counter shows zero for each product, indicating that no comparative performance tests have been logged.

Without measured scores, the data cannot confirm which part is faster in any specific workload. The absence of benchmark data means that any quantitative comparison between these two accelerators is impossible from the recorded information. What remains available are the architectural specifications and memory parameters, which provide a basis for qualitative differentiation.

The Instinct MI455X carries a peak FP32 throughput of 157.3 TFLOPS, while the Ryzen Z2 Go GPU delivers 4.147 TFLOPS FP32. That is a 37.9 times difference in raw shader throughput, but no benchmark score confirms how this translates into application performance. The texture rate for the MI455X is listed at 2,457.6 GTexel/s versus 129.6 GTexel/s for the Z2 Go, a ratio of approximately 19 to 1. Pixel rate tells a different story: the MI455X is recorded at 0 MPixel/s, while the Z2 Go reaches 86.40 GPixel/s. This indicates the MI455X has no raster output stage, while the Z2 Go is a conventional render-capable GPU.

Architecture Differences

The two chips represent fundamentally different design philosophies. The Instinct MI455X is built on the CDNA 5.0 architecture, a compute-focused design intended for data center acceleration. The Ryzen Z2 Go uses RDNA 2.0, a graphics-oriented architecture for client and console use. The MI455X uses the MI450 256CU chip, fabricated on a 2 nm process at TSMC. The Z2 Go uses the Rembrandt+ chip, also from TSMC but on a 6 nm node. Transistor counts differ drastically: the MI455X integrates 320,000 million transistors on a 2990 mm² die, yielding a transistor density of 107.0 million per mm². The Z2 Go packs 13,100 million transistors into a 208 mm² die, for a density of 63.0 million per mm². The MI455X is roughly 14.4 times larger in die area and holds about 24.4 times more transistors.

Memory subsystems are equally divergent. The MI455X uses 432 GB of HBM4 memory across a 24576-bit bus, delivering 23.3 TB/s of bandwidth. The Z2 Go uses 16 GB of LPDDR5 on a 128-bit bus, with 102.4 GB/s bandwidth. That is a 227.5 times difference in bandwidth and a 27 times difference in capacity. The MI455X memory clock is 1900 MHz (7.6 Gbps effective), while the Z2 Go memory clock is 800 MHz (6.4 Gbps effective). The MI455X has 32768 shading units and 1024 texture mapping units, with zero ROPs. The Z2 Go has 768 shading units, 48 TMUs, 32 ROPs, and 12 ray tracing cores. The MI455X lists no RT cores, consistent with its compute-only role.

The MI455X operates with a 2300 W TDP and suggests a 2700 W power supply. The Z2 Go has a 28 W TDP and no suggested PSU, reflecting its low-power integrated nature. Clock behavior also differs: the MI455X has a 1000 MHz base and 2400 MHz boost, while the Z2 Go has an 800 MHz base and 2700 MHz boost. The Z2 Go boosts 300 MHz higher, but the MI455X has far more execution units. The MI455X supports no display outputs, while the Z2 Go has one USB Type-C output. API support separates them completely: the MI455X has no DirectX, OpenGL, or Vulkan support, while the Z2 Go supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

The MI455X is part of the Instinct (MIx) generation, with a release date of 2026-07-22. The Z2 Go belongs to the Console GPU (AMD) generation, released 2024-12-31. The MI455X predecessor is Radeon Instinct, and it uses a PCIe 6.0 x16 bus interface. The Z2 Go has no recorded bus interface. The MI455X is an EAM Module slot width, while the Z2 Go has no slot width recorded. The Z2 Go has a production status of Active, while the MI455X has no production status listed.

The Verdict

The data shows two products with no shared use case. The Instinct MI455X is a massive compute accelerator with 432 GB of HBM4 memory, 23.3 TB/s bandwidth, and 157.3 TFLOPS FP32 throughput. It is designed for workloads that do not require display output, rasterization, or conventional graphics APIs. Its 2300 W TDP and 2700 W suggested PSU indicate a data center installation with dedicated power and cooling. The Ryzen Z2 Go GPU is a 28 W part with 16 GB of LPDDR5, 102.4 GB/s bandwidth, and 4.147 TFLOPS FP32. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, and it has 12 ray tracing cores, making it suitable for rendering and gaming workloads in a low-power environment.

Benchmark results are absent, so no performance ranking can be assigned. The architectural record, however, indicates that the MI455X would dominate in compute throughput and memory bandwidth, while the Z2 Go alone supports graphics APIs and display output. The MI455X has zero ROPs and no display outputs, so it cannot render frames to a screen. The Z2 Go has 32 ROPs and a USB Type-C output, enabling video output. The MI455X has no DirectX, OpenGL, or Vulkan support, meaning it cannot run standard graphics applications. The Z2 Go supports all three major APIs.

Power consumption reinforces the separation. The MI455X draws 2300 W, which is 82.1 times the Z2 Go's 28 W TDP. The Z2 Go has no suggested PSU, while the MI455X recommends a 2700 W unit. The MI455X operates at 1000 MHz base and 2400 MHz boost, while the Z2 Go runs at 800 MHz base and 2700 MHz boost. The MI455X has 32768 shading units versus 768 on the Z2 Go, a 42.7 times difference. Texture units are 1024 versus 48, a 21.3 times difference. The MI455X has no RT cores, while the Z2 Go has 12.

FAQ

Q: Which GPU has higher FP32 compute throughput?

A: The AMD Instinct MI455X delivers 157.3 TFLOPS FP32, while the AMD Ryzen Z2 Go GPU provides 4.147 TFLOPS FP32. The MI455X is approximately 37.9 times higher in raw FP32 performance.

Q: How do the memory configurations compare?

A: The MI455X uses 432 GB of HBM4 with a 24576-bit bus and 23.3 TB/s bandwidth. The Z2 Go uses 16 GB of LPDDR5 on a 128-bit bus with 102.4 GB/s bandwidth. The MI455X has 27 times the capacity and 227.5 times the bandwidth.

Q: Does the MI455X support graphics APIs like DirectX or Vulkan?

A: No. The MI455X lists DirectX as N/A, OpenGL as N/A, and Vulkan as N/A. The Z2 Go supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: Can either GPU output to a display?

A: The MI455X has no display outputs. The Z2 Go has one USB Type-C output. The MI455X also has a pixel rate of 0 MPixel/s, while the Z2 Go has a pixel rate of 86.40 GPixel/s.

Q: What are the power requirements for each part?

A: The MI455X has a 2300 W TDP and a suggested PSU of 2700 W. The Z2 Go has a 28 W TDP and no suggested PSU recorded.

Q: Which GPU has ray tracing support?

A: The Z2 Go includes 12 ray tracing cores. The MI455X has no ray tracing cores listed.

Where Each One Wins

The AMD Instinct MI455X wins on every compute-oriented specification. It offers 157.3 TFLOPS FP32, 157.3 TFLOPS FP16 (1:1 ratio), a texture rate of 2,457.6 GTexel/s, and a transistor count of 320,000 million. Its 432 GB HBM4 memory with 23.3 TB/s bandwidth is suited for large model training or inference workloads. The 24576-bit bus width is unprecedented in the consumer space. The 2 nm process node and 107.0 million transistors per mm² density indicate a leading-edge manufacturing approach. The MI455X also carries a higher memory clock at 1900 MHz versus 800 MHz, and a wider bus interface at PCIe 6.0 x16.

The AMD Ryzen Z2 Go GPU wins on graphics and power efficiency. It has 32 ROPs and a pixel rate of 86.40 GPixel/s, while the MI455X has zero ROPs and 0 MPixel/s. The Z2 Go supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, making it a functional graphics processor. It includes 12 ray tracing cores for hardware-accelerated ray tracing. Its 28 W TDP is 82.1 times lower than the MI455X's 2300 W. The Z2 Go boosts to 2700 MHz, 300 MHz higher than the MI455X's boost clock. It has a display output (1x USB Type-C), while the MI455X has none. The Z2 Go is also smaller at 208 mm² die size and uses fewer transistors at 13,100 million, indicating a much simpler design.

The FP16 computation ratio differs: the MI455X achieves 157.3 TFLOPS FP16 with a 1:1 ratio to FP32, while the Z2 Go reaches 8.294 TFLOPS FP16 with a 2:1 ratio. This means the MI455X treats FP16 and FP32 equally, while the Z2 Go doubles its FP16 rate relative to FP32. The Z2 Go has an active production status, while the MI455X has no production status recorded. The release dates also differ: the MI455X is dated 2026-07-22, while the Z2 Go is dated 2024-12-31.

For compute-heavy data center tasks where power and size are not constraints, the MI455X is the clear choice based on memory bandwidth, FP32 throughput, and transistor scale. For a low-power, render-capable GPU with API support, ray tracing, and display output, the Z2 Go is the only option of the two. The data shows no overlap in their intended operating domains.