AMD Instinct MI355X vs AMD Ryzen Z1 GPU Comparison

AMD Instinct MI355X and AMD Ryzen Z1 GPU occupy opposite ends of the AMD accelerator spectrum. The MI355X is a data center compute module built on CDNA 4.0, while the Ryzen Z1 GPU is a compact console-oriented part on RDNA 3.0. The recorded data shows no overlapping benchmark scores, so the analysis rests on architectural and specification differences.

Head-to-Head Benchmarks

No benchmark entries exist for either part in the database. Both products carry an average benchmark score of 0 and a percentile ranking of 50 against all GPUs. Without measured frame rates or compute scores, direct numerical comparison is impossible. The specification sheets provide the only quantitative basis for comparison.

The MI355X delivers 78.64 TFLOPS of FP32 compute. The Ryzen Z1 GPU delivers 2.560 TFLOPS. That puts the MI355X at roughly 30.7 times the raw FP32 throughput. The gap is expected given the product classes. The MI355X uses 16,384 shading units, while the Ryzen Z1 GPU uses 256. Texture rate follows the same pattern: 2,457.6 GTexel/s for the MI355X versus 40.00 GTexel/s for the Ryzen Z1 GPU. That is a 61.4x difference in texture fill rate.

Pixel rate flips the story. The MI355X lists 0 MPixel/s because it has no ROPs and no display outputs. The Ryzen Z1 GPU has 8 ROPs and produces 20.00 GPixel/s. For any rasterization workload that needs pixel output, the Ryzen Z1 GPU is the only one of the two that can complete the job. The MI355X is not designed for rendering to a screen.

Memory bandwidth shows another massive split. The MI355X uses 288 GB of HBM3e across an 8192-bit bus, yielding 8.19 TB/s. The Ryzen Z1 GPU uses 16 GB of LPDDR5 across a 64-bit bus, yielding 51.20 GB/s. The MI355X has 160 times the bandwidth. That figure matters for large model inference and training loops where data movement dominates.

FP16 performance differs in ratio. The MI355X lists 78.64 TFLOPS FP16 at a 1:1 ratio to FP32. The Ryzen Z1 GPU lists 5.120 TFLOPS FP16 at a 2:1 ratio. The MI355X still leads by a wide margin, but the Ryzen Z1 GPU's FP16 advantage over its own FP32 shows the architecture favors mixed-precision work. The MI355X treats FP16 and FP32 equally, which suits compute kernels that stay in one precision.

Clock speeds are close. The MI355X runs at 1000 MHz base and 2400 MHz boost. The Ryzen Z1 GPU runs at 1500 MHz base and 2500 MHz boost. The Ryzen Z1 GPU actually boosts 100 MHz higher. The MI355X compensates with 64 times the shading units and a far wider memory interface.

The transistor counts reflect the physical scale difference. The MI355X integrates 185,000 million transistors on a 2380 mm² die using TSMC 3 nm. The Ryzen Z1 GPU integrates 25,390 million transistors on a 178 mm² die using TSMC 4 nm. The MI355X die is roughly 13.4 times larger. Transistor density favors the Ryzen Z1 GPU at 142.6M per mm² versus 77.7M per mm² for the MI355X.

The Verdict

The data points to two different buyers. The MI355X is for compute environments that need massive FP32, FP16, and memory bandwidth. Its 1400 W TDP and OAM Module slot width indicate a server rack installation with 1800 W suggested PSU. It has no display outputs, no DirectX, OpenGL, or Vulkan support, and no ROPs. It cannot render a desktop or run a game.

The Ryzen Z1 GPU is for compact systems that need rendering capability. It supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. It has 4 ray tracing cores and 8 ROPs. Its 30 W TDP and physical dimensions of 280 mm length, 111 mm height, and 21 mm width fit it for small form factor or handheld designs. It launched at 599 USD as a launch MSRP.

Neither part replaces the other. The MI355X wins every compute metric except pixel rate and clock speed. The Ryzen Z1 GPU wins every rendering and efficiency metric. The percentile rankings are identical at 50, but that is an artifact of the empty benchmark set, not a sign of comparable performance.

Where Each One Wins

Compute density: the MI355X wins. It has 16,384 shading units, 1024 TMUs, and 78.64 TFLOPS FP32. The Ryzen Z1 GPU has 256 shading units and 16 TMUs.

Memory capacity: the MI355X wins with 288 GB versus 16 GB. That is 18 times the capacity. The bandwidth gap is even larger at 8.19 TB/s versus 51.20 GB/s.

Rasterization: the Ryzen Z1 GPU wins because the MI355X has no ROPs and 0 MPixel/s pixel rate. The Ryzen Z1 GPU outputs 20.00 GPixel/s.

API compatibility: the Ryzen Z1 GPU wins. It supports modern graphics APIs. The MI355X reports N/A for DirectX, OpenGL, and Vulkan.

Efficiency: the Ryzen Z1 GPU wins on power draw. Its 30 W TDP is a fraction of the MI355X's 1400 W. The Ryzen Z1 GPU also has no suggested PSU requirement, while the MI355X needs an 1800 W unit.

Physical footprint: the Ryzen Z1 GPU wins. It measures 280 mm by 111 mm by 21 mm. The MI355X measures 102 mm by 165 mm as an OAM Module, but requires the surrounding server infrastructure.

Release timing: the MI355X released on 2025-06-11. The Ryzen Z1 GPU released on 2023-09-17. The MI355X is nearly two years newer.

FAQ

Q: Which GPU has higher FP32 compute?

A: The MI355X delivers 78.64 TFLOPS FP32. The Ryzen Z1 GPU delivers 2.560 TFLOPS. The MI355X has roughly 30.7 times the FP32 throughput.

Q: Can either GPU output to a display?

A: No. Both list "No outputs" for display outputs. The Ryzen Z1 GPU has ROPs and a pixel rate of 20.00 GPixel/s, but it has no physical display connectors in the database.

Q: Which GPU supports ray tracing?

A: Only the Ryzen Z1 GPU. It lists 4 ray tracing cores. The MI355X lists no ray tracing cores.

Q: What is the memory bandwidth difference?

A: The MI355X provides 8.19 TB/s over an 8192-bit HBM3e interface. The Ryzen Z1 GPU provides 51.20 GB/s over a 64-bit LPDDR5 interface. The MI355X has 160 times the bandwidth.

Q: Which GPU supports DirectX?

A: The Ryzen Z1 GPU supports DirectX 12 Ultimate (12_2). The MI355X reports N/A for DirectX support.

Q: What are the power requirements?

A: The MI355X has a 1400 W TDP and a suggested PSU of 1800 W. The Ryzen Z1 GPU has a 30 W TDP and no suggested PSU listed.

Architecture Differences

The MI355X uses CDNA 4.0 architecture on the MI350 256CU chip. The Ryzen Z1 GPU uses RDNA 3.0 architecture on the Phoenix chip. These are different design philosophies. CDNA targets compute throughput with a massive number of compute units and no graphics pipeline. RDNA targets graphics with a full rasterization and ray tracing pipeline.

Process nodes differ. The MI355X uses TSMC 3 nm. The Ryzen Z1 GPU uses TSMC 4 nm. The MI355X's 3 nm node allows 185,000 million transistors on a 2380 mm² die. The Ryzen Z1 GPU fits 25,390 million transistors on 178 mm². The transistor density numbers show the Ryzen Z1 GPU packs more transistors per area, 142.6M per mm² versus 77.7M per mm².

Memory architecture is fundamentally different. The MI355X uses HBM3e with an 8192-bit bus. The Ryzen Z1 GPU uses LPDDR5 with a 64-bit bus. The MI355X has no ROPs and no pixel rate, confirming it has no display or rasterization hardware. The Ryzen Z1 GPU has 8 ROPs and 4 ray tracing cores.

API support separates the two completely. The MI355X reports N/A for DirectX, OpenGL, and Vulkan. The Ryzen Z1 GPU reports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The Ryzen Z1 GPU also has a production status of Active, while the MI355X has no production status listed.

Specification Differences

The MI355X has 16,384 shading units, 1024 TMUs, and 0 ROPs. The Ryzen Z1 GPU has 256 shading units, 16 TMUs, and 8 ROPs. The MI355X has no ray tracing cores; the Ryzen Z1 GPU has 4.

Memory: MI355X has 288 GB HBM3e, 8192-bit bus, 8.19 TB/s bandwidth. Ryzen Z1 GPU has 16 GB LPDDR5, 64-bit bus, 51.20 GB/s bandwidth.

Clocks: MI355X runs at 1000 MHz base, 2400 MHz boost, 2000 MHz memory. Ryzen Z1 GPU runs at 1500 MHz base, 2500 MHz boost, 800 MHz memory.

Compute rates: MI355X produces 78.64 TFLOPS FP32 and 78.64 TFLOPS FP16 at 1:1. Ryzen Z1 GPU produces 2.560 TFLOPS FP32 and 5.120 TFLOPS FP16 at 2:1.

Pixel and texture rates: MI355X has 0 MPixel/s and 2,457.6 GTexel/s. Ryzen Z1 GPU has 20.00 GPixel/s and 40.00 GTexel/s.

Power: MI355X has 1400 W TDP, OAM Module slot width, 1800 W suggested PSU, no power connectors. Ryzen Z1 GPU has 30 W TDP, no slot width, no suggested PSU, no power connectors.

Physical: MI355X measures 102 mm by 165 mm. Ryzen Z1 GPU measures 280 mm by 111 mm by 21 mm.

Bus interface: MI355X uses PCIe 5.0 x16. Ryzen Z1 GPU has no bus interface listed.

Release dates: MI355X released 2025-06-11. Ryzen Z1 GPU released 2023-09-17.

The MI355X has no launch MSRP. The Ryzen Z1 GPU has a launch MSRP of 599 USD.

The MI355X predecessor is Radeon Instinct. The Ryzen Z1 GPU has no predecessor listed. Neither has a successor listed.