AMD Instinct MI325X vs AMD Ryzen Z2 GPU Comparison

The Verdict

The AMD Instinct MI325X and AMD Ryzen Z2 GPU are fundamentally different products that happen to share a manufacturer. The MI325X is a data center accelerator built for massive parallel compute workloads, while the Ryzen Z2 GPU is a low-power integrated graphics solution for portable gaming systems. Benchmark data shows no direct head-to-head comparisons, but the specification differences are stark enough to draw clear conclusions.

The MI325X should be chosen for server-side machine learning inference, high-performance computing, and large-scale matrix operations. Its 256 GB of HBM3e memory and 6.14 TB/s bandwidth position it as a compute-focused accelerator. The Ryzen Z2 GPU is for handheld gaming devices where power consumption and physical size matter more than raw throughput. Its 28 W TDP and compact 178 mm² die size make it suitable for battery-powered hardware.

Data from the database indicates the MI325X has a 50th percentile ranking among all GPUs, as does the Ryzen Z2 GPU. Both products sit at the median of the recorded benchmark distribution, though they address entirely separate markets. The MI325X delivers 81.72 TFLOPS of FP32 performance versus 8.294 TFLOPS for the Ryzen Z2 GPU, a roughly 10x gap in raw compute throughput. Memory bandwidth differs even more dramatically: 6.14 TB/s versus 119.9 GB/s, a 51x difference.

The Ryzen Z2 GPU is the only one of the two with active display outputs, featuring a single USB Type-C connector. It supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the MI325X reports no graphics API support. The MI325X targets compute workloads, not rendering. The production status field lists the Ryzen Z2 GPU as active, while no production status is recorded for the MI325X.

Architecture Differences

The MI325X uses the Aqua Vanjaram chip built on CDNA 3.0 architecture, manufactured on a 5 nm process by TSMC. It integrates 153,000 million transistors across a 1017 mm² die, yielding a transistor density of 150.4M per mm². The Ryzen Z2 GPU uses the Hawk Point chip based on RDNA 3.0 architecture, also from TSMC but on a 4 nm process. It packs 25,390 million transistors into a 178 mm² die, with a slightly lower density of 142.6M per mm².

The MI325X belongs to the Instinct (MIx) generation, while the Ryzen Z2 GPU belongs to the Console GPU (AMD) generation. The MI325X has no display outputs, no graphics API support, and no pixel rate (recorded as 0 MPixel/s). It has 19,456 shading units and 1,216 texture mapping units, but zero ROPs. The Ryzen Z2 GPU has 768 shading units, 48 TMUs, 32 ROPs, and 12 ray tracing cores. This reflects their divergent purposes: the MI325X is a pure compute engine, while the Ryzen Z2 GPU has a full graphics pipeline.

Both chips come from TSMC, but the process nodes differ. The MI325X uses 5 nm, the Ryzen Z2 GPU uses 4 nm. Clock behavior also differs. The MI325X has a base clock of 1000 MHz and a boost clock of 2100 MHz. The Ryzen Z2 GPU has a lower base of 800 MHz but a higher boost of 2700 MHz. Memory clocks show the MI325X running at 1500 MHz with 6 Gbps effective transfer, while the Ryzen Z2 GPU runs at 937 MHz with 7.5 Gbps effective. These figures reflect the different memory types: HBM3e versus LPDDR5X.

The MI325X uses an OAM Module slot width with no power connectors and a suggested PSU of 1400 W. Its TDP is 1000 W. The Ryzen Z2 GPU has no recorded slot width, no power connectors, and no suggested PSU, with a TDP of just 28 W. The bus interface for the MI325X is PCIe 5.0 x16, while the Ryzen Z2 GPU has no recorded bus interface.

FAQ

Q: Which GPU has more memory?

A: The MI325X has 256 GB of HBM3e memory with an 8192-bit bus width. The Ryzen Z2 GPU has 16 GB of LPDDR5X memory on a 128-bit bus.

Q: What is the performance difference in FP32 compute?

A: The MI325X delivers 81.72 TFLOPS of FP32 performance. The Ryzen Z2 GPU delivers 8.294 TFLOPS. The MI325X is approximately 10 times faster in raw FP32 throughput.

Q: Do these GPUs support the same graphics APIs?

A: No. The MI325X reports N/A for DirectX, OpenGL, and Vulkan. The Ryzen Z2 GPU supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: How do their power requirements compare?

A: The MI325X has a TDP of 1000 W and a suggested PSU of 1400 W. The Ryzen Z2 GPU has a TDP of 28 W and no suggested PSU requirement recorded.

Q: What display outputs does each GPU have?

A: The MI325X has no display outputs. The Ryzen Z2 GPU has one USB Type-C output.

Q: Which GPU has ray tracing support?

A: The Ryzen Z2 GPU has 12 ray tracing cores. The MI325X has no recorded ray tracing cores.

Specification Differences

The two GPUs differ across nearly every recorded specification field. Die size: 1017 mm² for the MI325X versus 178 mm² for the Ryzen Z2 GPU. Transistor count: 153,000 million versus 25,390 million. Transistor density: 150.4M per mm² versus 142.6M per mm².

Memory configuration shows the widest gap. The MI325X uses 256 GB of HBM3e with an 8192-bit bus and 6.14 TB/s bandwidth. The Ryzen Z2 GPU uses 16 GB of LPDDR5X with a 128-bit bus and 119.9 GB/s bandwidth. The MI325X has a 64x larger memory pool and a 51x higher bandwidth figure.

Compute resources: the MI325X has 19,456 shading units, 1,216 TMUs, and 0 ROPs. The Ryzen Z2 GPU has 768 shading units, 48 TMUs, 32 ROPs, and 12 ray tracing cores. 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. Both report FP16 at 1:1 ratio, matching their FP32 figures.

Clocks: base 1000 MHz versus 800 MHz, boost 2100 MHz versus 2700 MHz, memory 1500 MHz versus 937 MHz. Effective memory clock: 6 Gbps versus 7.5 Gbps.

Process node: 5 nm versus 4 nm, both from TSMC. Architecture: CDNA 3.0 versus RDNA 3.0. Chip: Aqua Vanjaram versus Hawk Point. Generation: Instinct (MIx) versus Console GPU (AMD).

Power: TDP 1000 W versus 28 W. The MI325X has a suggested PSU of 1400 W, the Ryzen Z2 GPU has none. Slot width: OAM Module for the MI325X, not recorded for the Ryzen Z2 GPU. Power connectors: none for both. Bus interface: PCIe 5.0 x16 for the MI325X, not recorded for the Ryzen Z2 GPU.

Display outputs: none for the MI325X, one USB Type-C for the Ryzen Z2 GPU. API support: N/A for the MI325X, DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4 for the Ryzen Z2 GPU. Release dates: 2024-10-09 for the MI325X, 2024-12-31 for the Ryzen Z2 GPU. Production status: not recorded for the MI325X, Active for the Ryzen Z2 GPU.

Head-to-Head Benchmarks

The database contains no recorded head-to-head benchmark results between these two products. The winsA and winsB fields both show zero, and the headToHeadBenchmarks array is empty. This absence of direct comparison data reflects their different market positions. No benchmark suite would reasonably place a 1000 W accelerator and a 28 W integrated GPU in the same test.

However, the recorded specification data allows for direct mathematical comparison. In FP32 throughput, the MI325X achieves 81.72 TFLOPS against 8.294 TFLOPS for the Ryzen Z2 GPU. This 9.85x advantage in compute throughput comes from the MI325X's 19,456 shading units versus 768, a 25.3x difference in shading unit count. The MI325X's higher base clock of 1000 MHz versus 800 MHz adds additional throughput per unit.

Texture rate favors the MI325X at 2,553.6 GTexel/s versus 129.6 GTexel/s, a 19.7x difference. The Ryzen Z2 GPU counters in pixel processing: 86.40 GPixel/s versus 0 MPixel/s for the MI325X. This is not a win for the Ryzen Z2 GPU in the traditional sense; the MI325X simply has no rasterization hardware, as its 0 ROPs indicate.

Memory bandwidth presents the largest single-metric gap. The MI325X delivers 6.14 TB/s through an 8192-bit HBM3e interface. The Ryzen Z2 GPU manages 119.9 GB/s via a 128-bit LPDDR5X bus. The bandwidth ratio is approximately 51.2 to 1. Memory capacity follows a similar pattern: 256 GB versus 16 GB, a 16x difference.

The Ryzen Z2 GPU holds advantages in several fields. Its boost clock of 2700 MHz exceeds the MI325X's 2100 MHz. Its effective memory clock of 7.5 Gbps beats the MI325X's 6 Gbps. Its process node is smaller at 4 nm versus 5 nm. Its transistor density is lower at 142.6M per mm² versus 150.4M per mm², but its 178 mm² die is far smaller than the 1017 mm² MI325X.

Power efficiency strongly favors the Ryzen Z2 GPU. It delivers 8.294 TFLOPS at 28 W, while the MI325X delivers 81.72 TFLOPS at 1000 W. Per watt of power, the Ryzen Z2 GPU produces approximately 0.296 TFLOPS/W, while the MI325X produces approximately 0.0817 TFLOPS/W. The Ryzen Z2 GPU is roughly 3.6 times more efficient in FP32 throughput per watt, though the MI325X still offers far higher absolute performance.

Where Each One Wins

The MI325X wins decisively in every absolute compute metric recorded. Its 81.72 TFLOPS FP32 throughput, 2,553.6 GTexel/s texture rate, and 6.14 TB/s memory bandwidth place it in a different performance class. The 256 GB memory capacity allows it to hold massive model weights for machine learning inference without host memory swapping. Its PCIe 5.0 x16 interface provides high-speed host communication. The 153,000 million transistor count on a 1017 mm² die indicates a chip designed for maximum parallel compute, not efficiency.

The Ryzen Z2 GPU wins in power efficiency, physical size, and feature completeness for graphics workloads. Its 28 W TDP allows integration into battery-powered handheld devices. Its 178 mm² die and 25,390 million transistors fit into constrained form factors. The 12 ray tracing cores, 32 ROPs, and 86.40 GPixel/s pixel rate give it a full rendering pipeline. Its DirectX 12 Ultimate (12_2) support means it can run modern games with feature-level 12_2 requirements. The single USB Type-C display output enables direct connection to a display without additional hardware. Its 4 nm process node represents a more advanced manufacturing technology than the MI325X's 5 nm node.

The production status field records the Ryzen Z2 GPU as Active, indicating current availability. The MI325X has no production status recorded. The release dates show the MI325X arrived first on 2024-10-09, with the Ryzen Z2 GPU following on 2024-12-31.

For use cases involving large-scale matrix multiplication, neural network training, or scientific simulation, the MI325X is the only viable option between the two. Its memory bandwidth alone exceeds the Ryzen Z2 GPU's total memory bandwidth by over 50 times. For gaming handhelds, thin-and-light laptops, or any battery-constrained system requiring graphics output, the Ryzen Z2 GPU is the appropriate choice. The MI325X cannot display an image, has no graphics API support, and requires a 1400 W power supply.

The data does not support a single "best" product. It supports two distinct products for two distinct workloads. The MI325X is a compute accelerator with no display capabilities. The Ryzen Z2 GPU is a graphics processor with modest compute capabilities. Any purchasing decision must first identify the workload, then match it to the appropriate architecture.