AMD Instinct MI355X vs AMD Ryzen Z2 Extreme GPU Comparison

AMD Instinct MI355X and AMD Ryzen Z2 Extreme GPU occupy opposite ends of the AMD accelerator spectrum. The MI355X is a data center compute module aimed at massive parallel workloads, while the Z2 Extreme is a low-power console-class integrated GPU. The recorded data shows no shared benchmark results, so the comparison relies on architectural specifications and the Z2 Extreme’s single available benchmark score.

Where Each One Wins

The AMD Instinct MI355X wins outright in raw compute throughput. Its CDNA 4.0 architecture delivers 78.64 TFLOPS FP32 and the same 78.64 TFLOPS FP16 (1:1), compared to the Z2 Extreme’s 5.530 TFLOPS in both formats. That is a 14.2x advantage in FP32 and FP16, placing the MI355X in a performance class that the Z2 Extreme cannot approach. The MI355X also holds a massive memory advantage: 288 GB of HBM3e on an 8192-bit bus delivers 8.19 TB/s of bandwidth, versus 16 GB of LPDDR5X on a 128-bit bus at 128.0 GB/s. This makes the MI355X the clear winner for memory-bound workloads, large model inference, and high-resolution data processing.

The AMD Ryzen Z2 Extreme wins in efficiency and practical integration. Its 28 W TDP contrasts sharply with the MI355X’s 1400 W TDP, and its 4 nm process node (TSMC) enables a compact 233 mm² die with 34,000 million transistors. The Z2 Extreme also supports modern graphics APIs: DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, whereas the MI355X lists N/A for all three. The Z2 Extreme includes 16 ray tracing cores and 48 ROPs, producing a pixel rate of 129.6 GPixel/s. The MI355X reports 0 ROPs and 0 MPixel/s, meaning it is not designed for rasterized output. The Z2 Extreme also has a display output (1x USB Type-C), while the MI355X has no display outputs. For any workload requiring visual output, real-time graphics, or consumer software compatibility, the Z2 Extreme is the functional choice.

Architecture Differences

The two chips share the AMD brand but diverge completely in design philosophy. The MI355X uses the CDNA 4.0 architecture, built specifically for compute acceleration, while the Z2 Extreme uses RDNA 3.5, designed for graphics rendering. The process nodes differ: the MI355X uses a 3 nm TSMC process, the Z2 Extreme uses 4 nm TSMC. The MI355X packs 185,000 million transistors onto a 2380 mm² die, yielding a transistor density of 77.7M per mm². The Z2 Extreme fits 34,000 million transistors onto 233 mm², achieving a much higher density of 145.9M per mm². The smaller, denser node of the Z2 Extreme reflects its efficiency focus, while the MI355X’s enormous die prioritizes raw throughput.

Compute resources differ by an order of magnitude. The MI355X contains 16,384 shading units, 1024 TMUs, and no ROPs, with a texture rate of 2,457.6 GTexel/s. The Z2 Extreme has 1024 shading units, 64 TMUs, and 48 ROPs, with a texture rate of 172.8 GTexel/s. The MI355X has 16x the shading units and 16x the TMUs, but zero pixel output capability. The Z2 Extreme’s 16 ray tracing cores are absent from the MI355X, which lists no RT cores. Clock behavior also differs: the MI355X runs at a base of 1000 MHz and boosts to 2400 MHz, while the Z2 Extreme starts at 800 MHz and boosts to 2700 MHz. The Z2 Extreme’s higher boost clock partially compensates for its smaller core count, but the raw throughput gap remains enormous.

Memory architecture is fundamentally different. The MI355X uses HBM3e with 288 GB capacity, 8192-bit bus width, and 8.19 TB/s bandwidth, with memory clocked at 2000 MHz (8 Gbps effective). The Z2 Extreme uses LPDDR5X with 16 GB capacity, 128-bit bus width, and 128.0 GB/s bandwidth, at 1000 MHz (8 Gbps effective). The MI355X delivers 64x the memory bandwidth, which is critical for the large datasets typical of compute workloads. The Z2 Extreme’s 16 GB capacity suits embedded and handheld use, but the bandwidth is 64x lower. The MI355X is an OAM Module with no power connectors and a suggested PSU of 1800 W; the Z2 Extreme has no slot width specified, no power connectors, and no suggested PSU, reflecting its 28 W TDP.

Head-to-Head Benchmarks

The database contains no shared benchmark scores between the two GPUs. The MI355X has no recorded benchmarks, an average score of 0, and a percentile of 50 among all GPUs. The Z2 Extreme has one benchmark result: a 3DMark Steel Nomad DX12 score of 516, placing it at the 1st percentile. Its nearest rivals in the database are the Intel HD Graphics P4000 (score 534, 3.4% higher), AMD Radeon HD 6870 (score 536, 3.7% higher), AMD Radeon HD 6750M (score 484, 6.6% lower), and AMD Radeon HD 6770M (score 569, 9.3% higher). These deltas show the Z2 Extreme sits near the bottom of the GPU performance distribution, roughly 3.4% to 9.3% below the higher-scoring rivals and 6.6% above the lowest.

Without head-to-head results, the comparison must be inferred from specifications. The MI355X’s FP32 throughput of 78.64 TFLOPS is 14.2x the Z2 Extreme’s 5.530 TFLOPS. Its texture rate of 2,457.6 GTexel/s is 14.2x the Z2 Extreme’s 172.8 GTexel/s. The MI355X’s memory bandwidth of 8.19 TB/s is 64x the Z2 Extreme’s 128.0 GB/s. The Z2 Extreme counters with a pixel rate of 129.6 GPixel/s, which the MI355X cannot match at 0 MPixel/s. The Z2 Extreme also has a 2700 MHz boost clock versus 2400 MHz, and its 145.9M transistor density per mm² is 1.88x the MI355X’s 77.7M. These specification deltas define the workloads each chip can handle: the MI355X for compute density, the Z2 Extreme for graphics output and portability.

The percentile data reinforces the contrast. The MI355X sits at the 50th percentile among all GPUs, indicating a mid-range position in the overall distribution, though this is based on zero benchmark scores. The Z2 Extreme sits at the 1st percentile, with its single 516 score placing it near the very bottom. The nearest rival data for the Z2 Extreme shows a tight cluster: the highest rival (AMD Radeon HD 6770M) scores 569, just 9.3% higher, and the lowest (AMD Radeon HD 6750M) scores 484, 6.6% lower. This places the Z2 Extreme in a narrow performance band, far below any compute-class accelerator.

The Verdict

The data indicates two distinct use cases with no overlap. The AMD Instinct MI355X is designed for compute-heavy, memory-intensive workloads where 78.64 TFLOPS FP32, 288 GB of HBM3e, and 8.19 TB/s bandwidth are essential. Its 1400 W TDP and OAM Module form factor, with no display outputs and no graphics API support, make it unsuitable for consumer graphics. The MI355X’s 2380 mm² die and 185,000 million transistors confirm a purpose-built accelerator for data center tasks, despite having no recorded benchmark scores.

The AMD Ryzen Z2 Extreme GPU is a low-power graphics processor for embedded or handheld systems. Its 28 W TDP, 233 mm² die, and 4 nm process enable integration into compact devices. The 516 3DMark Steel Nomad DX12 score and 1st percentile ranking show it is not a high-performance part, but its 16 ray tracing cores, 129.6 GPixel/s pixel rate, and DirectX 12 Ultimate support enable modern graphics rendering. The Z2 Extreme’s 16 GB LPDDR5X and 128.0 GB/s bandwidth are modest but adequate for its class.

Users requiring massive parallel compute, large memory pools, or extreme bandwidth must choose the MI355X, as the Z2 Extreme lacks the resources for such tasks. Users needing a functional GPU with display output, ray tracing, and software API compatibility should select the Z2 Extreme, because the MI355X offers none of those features. The two products do not compete; they serve different markets entirely.

FAQ

Q: Which GPU has higher FP32 performance?

A: The AMD Instinct MI355X delivers 78.64 TFLOPS FP32, which is 14.2x the AMD Ryzen Z2 Extreme GPU’s 5.530 TFLOPS.

Q: What is the memory capacity and bandwidth difference?

A: The MI355X has 288 GB of HBM3e with 8.19 TB/s bandwidth on an 8192-bit bus. The Z2 Extreme has 16 GB of LPDDR5X with 128.0 GB/s bandwidth on a 128-bit bus. The MI355X offers 64x the bandwidth.

Q: Does the MI355X support display outputs?

A: No, the MI355X has no display outputs and lists N/A for DirectX, OpenGL, and Vulkan. The Z2 Extreme has one USB Type-C output and supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Q: What is the power consumption of each?

A: The MI355X has a TDP of 1400 W with a suggested PSU of 1800 W. The Z2 Extreme has a TDP of 28 W and no suggested PSU listed.

Q: How does the Z2 Extreme compare to its nearest rivals?

A: The Z2 Extreme scores 516 in 3DMark Steel Nomad DX12. It is 3.4% below the Intel HD Graphics P4000 (534), 3.7% below the AMD Radeon HD 6870 (536), 6.6% above the AMD Radeon HD 6750M (484), and 9.3% below the AMD Radeon HD 6770M (569).

Q: Which GPU has ray tracing cores?

A: The AMD Ryzen Z2 Extreme GPU includes 16 ray tracing cores. The AMD Instinct MI355X lists no ray tracing cores.

Q: What are the process node and die size differences?

A: The MI355X uses a 3 nm TSMC process with a 2380 mm² die and 185,000 million transistors. The Z2 Extreme uses a 4 nm TSMC process with a 233 mm² die and 34,000 million transistors. The Z2 Extreme has a higher transistor density at 145.9M per mm² versus 77.7M per mm².