AMD Instinct MI325X vs AMD Ryzen Z2 A GPU Comparison

The Verdict

The AMD Instinct MI325X and the AMD Ryzen Z2 A GPU occupy entirely separate positions in the database. The MI325X is a 1000 W compute accelerator built for server-side AI and HPC workloads, while the Z2 A is a 15 W integrated graphics solution for handheld consoles. The verdict is straightforward: the MI325X is for institutions needing massive memory bandwidth and FP32 throughput, the Z2 A is for compact, low-power systems requiring DirectX 12 Ultimate support. There is no overlap in intended use, and the data confirms they should not be cross-shopped.

Benchmark results show the MI325X delivers 81.72 TFLOPS FP32 performance, which is roughly 50 times the Z2 A's 1.638 TFLOPS. Memory bandwidth favors the MI325X at 6.14 TB/s versus 102.4 GB/s, a 60-fold gap. However, the Z2 A supports modern graphics APIs including DirectX 12 Ultimate and Vulkan 1.4, while the MI325X reports no API support at all. The Z2 A is the only one with display outputs (1x USB Type-C) and a production status of Active. The MI325X has no display outputs and no listed production status. Choose the MI325X for compute density and memory capacity, choose the Z2 A for a functional GPU in a low-power, API-complete package.

Architecture Differences

The two chips share a manufacturer but diverge at every architectural level. The MI325X uses the Aqua Vanjaram chip built on CDNA 3.0 architecture, fabricated on a 5 nm process by TSMC. The Z2 A uses the Van Gogh chip built on RDNA 2.0 architecture, fabricated on a 7 nm process also by TSMC. The process node difference is significant: 5 nm versus 7 nm, which contributes to the MI325X's higher transistor count of 153,000 million versus 2,400 million.

Die size tells the same story. The MI325X measures 1017 mm², compared to 163 mm² for the Z2 A. Transistor density follows: 150.4M per mm² for the MI325X versus 14.7M per mm² for the Z2 A. The MI325X belongs to the Instinct (MIx) generation, while the Z2 A belongs to the Console GPU (AMD) generation. The MI325X's predecessor is listed as Radeon Instinct, whereas the Z2 A has no predecessor listed.

Compute resources differ by orders of magnitude. The MI325X has 19456 shading units and 1216 TMUs, with no ROPs listed (pixel rate of 0 MPixel/s). The Z2 A has 512 shading units, 32 TMUs, and 16 ROPs, producing a pixel rate of 25.60 GPixel/s. The Z2 A also includes 8 ray tracing cores, while the MI325X lists none. Texture rate favors the MI325X at 2,553.6 GTexel/s versus 51.20 GTexel/s for the Z2 A.

FP16 performance reveals a different ratio. The MI325X delivers 81.72 TFLOPS FP16 at a 1:1 ratio to FP32. The Z2 A delivers 3.277 TFLOPS FP16 at a 2:1 ratio, meaning its FP16 throughput is double its FP32 rate. This indicates the Z2 A has some vector throughput advantage in half-precision workloads relative to its own FP32, while the MI325X treats both equally.

Head-to-Head Benchmarks

The database contains no recorded head-to-head benchmark results between these two GPUs. The wins counters show 0 for both sides, and the benchmark arrays are empty. However, the specification data provides clear quantitative comparisons that serve as proxy benchmarks.

In raw FP32 compute, the MI325X's 81.72 TFLOPS is exactly 49.9 times the Z2 A's 1.638 TFLOPS. Texture rate comparison shows the MI325X achieving 2,553.6 GTexel/s, which is 49.9 times the Z2 A's 51.20 GTexel/s. Memory bandwidth is the largest proportional gap: 6.14 TB/s versus 102.4 GB/s, a factor of 60. These ratios hold consistently across the compute-oriented metrics.

The Z2 A wins only where the MI325X has zero capability. Pixel rate: 25.60 GPixel/s versus 0 MPixel/s. Display outputs: 1x USB Type-C versus no outputs. API support: DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4 versus N/A for all three. The Z2 A also has a lower power envelope at 15 W versus 1000 W, which is not a performance win but a deployment advantage.

Clock speeds show the MI325X boosting to 2100 MHz from a 1000 MHz base, while the Z2 A boosts to 1600 MHz from the same 1000 MHz base. Memory clocks differ: the MI325X runs at 1500 MHz with 6 Gbps effective, the Z2 A at 800 MHz with 6.4 Gbps effective. The effective memory data rate is actually slightly higher on the Z2 A, but the bus width difference (8192 bit versus 128 bit) overwhelms this.

FAQ

Q: Which GPU has more memory, and how does the type differ?

A: The MI325X has 256 GB of HBM3e memory, while the Z2 A has 16 GB of LPDDR5. The MI325X uses an 8192-bit bus, the Z2 A a 128-bit bus.

Q: Can the MI325X output video to a display?

A: No. The MI325X lists no display outputs, while the Z2 A provides 1x USB Type-C for display connectivity.

Q: What API support does each GPU offer?

A: The Z2 A supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI325X reports N/A for DirectX, OpenGL, and Vulkan.

Q: How do the power requirements compare?

A: The MI325X has a TDP of 1000 W and suggests a 1400 W power supply. The Z2 A has a TDP of 15 W and lists no suggested PSU.

Q: Which GPU has ray tracing hardware?

A: The Z2 A includes 8 ray tracing cores. The MI325X lists no ray tracing cores.

Q: What are the FP16 performance ratios?

A: The MI325X delivers 81.72 TFLOPS FP16 at a 1:1 ratio to FP32. The Z2 A delivers 3.277 TFLOPS FP16 at a 2:1 ratio, meaning its FP16 is double its FP32.

Where Each One Wins

The MI325X wins decisively in every compute-heavy metric. FP32 performance at 81.72 TFLOPS versus 1.638 TFLOPS makes it the clear choice for dense matrix operations. Memory capacity of 256 GB versus 16 GB enables large model residency. Bandwidth of 6.14 TB/s versus 102.4 GB/s supports rapid data movement. Texture rate of 2,553.6 GTexel/s versus 51.20 GTexel/s favors high-fill-rate shader workloads. The 5 nm process node and 153,000 million transistors provide the underlying hardware advantage.

The Z2 A wins in integration and compatibility. Its 15 W TDP enables fanless or low-power designs, whereas the MI325X requires 1000 W and a 1400 W suggested PSU. The Z2 A's 16 ROPs deliver a pixel rate of 25.60 GPixel/s, which the MI325X cannot match at 0 MPixel/s. The Z2 A's DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 support means it can run consumer graphics workloads directly. The MI325X has no API support listed, making it unsuitable for standard rendering pipelines. The Z2 A's 8 ray tracing cores add hardware acceleration for ray-traced effects. The Z2 A also has a production status of Active, while the MI325X does not list one.

For handheld gaming or embedded graphics, the Z2 A's 16 GB LPDDR5 and USB Type-C output are practical. For server racks, the MI325X's OAM module form factor and PCIe 5.0 x16 interface address a different deployment scenario. The MI325X has a release date of 2024-10-09, the Z2 A a release date of 2024-12-31, both in the same generation window but aimed at distinct markets.

Specification Differences

The two GPUs differ in nearly every recorded field. Process node: 5 nm for the MI325X, 7 nm for the Z2 A. Transistors: 153,000 million versus 2,400 million. Die size: 1017 mm² versus 163 mm². Transistor density: 150.4M per mm² versus 14.7M per mm². Boost clock: 2100 MHz versus 1600 MHz. Memory clock: 1500 MHz (6 Gbps effective) versus 800 MHz (6.4 Gbps effective). Memory size: 256 GB versus 16 GB. Memory type: HBM3e versus LPDDR5. Bus width: 8192 bit versus 128 bit. Bandwidth: 6.14 TB/s versus 102.4 GB/s.

Shading units: 19456 versus 512. TMUs: 1216 versus 32. ROPs: 0 versus 16. Ray tracing cores: none versus 8. Pixel rate: 0 MPixel/s versus 25.60 GPixel/s. Texture rate: 2,553.6 GTexel/s versus 51.20 GTexel/s. FP32: 81.72 TFLOPS versus 1.638 TFLOPS. FP16: 81.72 TFLOPS (1:1) versus 3.277 TFLOPS (2:1). TDP: 1000 W versus 15 W. Slot width: OAM Module versus not listed. Power connectors: none versus not listed. Suggested PSU: 1400 W versus not listed. Bus interface: PCIe 5.0 x16 versus not listed. Display outputs: no outputs versus 1x USB Type-C. APIs: N/A versus DirectX 12 Ultimate, OpenGL 4.6, Vulkan 1.4. Release date: 2024-10-09 versus 2024-12-31. Production status: not listed versus Active. Predecessor: Radeon Instinct versus not listed. Percentile vs all GPUs: both at 50, but this reflects empty benchmark arrays rather than measured performance.