AMD Instinct MI355X vs AMD Radeon PRO W7900D Comparison

Head-to-Head Benchmarks

The database contains no recorded benchmark scores for either the AMD Instinct MI355X or the AMD Radeon PRO W7900D. Both cards hold a 50th percentile position among all GPUs in the database, and each has an average benchmark score of zero. The head-to-head benchmark matrix is empty, with zero wins recorded for either accelerator.

This absence of measured performance data means the comparison must rely entirely on architectural specifications and recorded hardware characteristics. The MI355X is an Instinct-class accelerator built for compute-oriented deployments, while the W7900D is a Radeon Pro workstation card designed for professional visualization workloads. Without benchmark numbers, the analysis shifts to what the specifications indicate about relative capability.

The MI355X shows 78.64 TFLOPS for both FP32 and FP16, with a 1:1 ratio between the two precision formats. The W7900D also shows a 1:1 FP32 to FP16 ratio, delivering 52.99 TFLOPS in both. The MI355X therefore presents a 48.4% higher raw floating-point throughput in both precisions compared to the W7900D. This difference suggests a substantial compute advantage for the Instinct part, though it does not translate directly into rendering or display performance since the MI355X has no display outputs.

The MI355X delivers a texture rate of 2,457.6 GTexel/s against 827.9 GTexel/s for the W7900D, a 2.97x advantage. The W7900D counters with a pixel rate of 414.0 GPixel/s, while the MI355X lists 0 MPixel/s, reflecting its lack of a raster output pipeline. Memory bandwidth follows the same pattern: the MI355X reaches 8.19 TB/s over an 8192-bit HBM3e interface, versus 864.0 GB/s over a 384-bit GDDR6 bus, a 9.48x gap.

FAQ

Q: Which card has higher FP32 compute throughput?

A: The AMD Instinct MI355X delivers 78.64 TFLOPS FP32, which is 48.4% higher than the Radeon PRO W7900D's 52.99 TFLOPS FP32.

Q: How do the memory capacities compare?

A: The MI355X carries 288 GB of HBM3e memory across an 8192-bit bus, while the W7900D has 48 GB of GDDR6 on a 384-bit bus. The MI355X provides six times the capacity.

Q: Does either card support display output?

A: No. The MI355X has no display outputs at all. The W7900D provides 3x DisplayPort 2.1 and 1x mini-DisplayPort 2.1 connectors.

Q: What is the power requirement difference?

A: The MI355X has a TDP of 1400 W with a suggested PSU of 1800 W and uses an OAM module form factor with no power connectors. The W7900D has a 295 W TDP, a suggested PSU of 600 W, and uses 2x 8-pin power connectors.

Q: Which card supports DirectX?

A: The MI355X reports N/A for DirectX, OpenGL, and Vulkan support. The W7900D supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: How do the release dates differ?

A: The MI355X was released on 2025-06-11, while the W7900D was released on 2025-09-24, making the W7900D the later launch by roughly three months.

Architecture Differences

The MI355X uses the CDNA 4.0 architecture on TSMC's 3 nm process, with the MI350 256CU chip. It contains 185,000 million transistors on a 2380 mm² die, yielding a transistor density of 77.7M per mm². The W7900D uses the RDNA 3.0 architecture on TSMC's 5 nm process, with the Navi 31 chip codenamed Plum Bonito. It packs 57,700 million transistors into a 529 mm² die, achieving 109.1M transistors per mm². The MI355X die is 4.5 times larger in area but has a lower transistor density.

Core configuration differs sharply. The MI355X has 16,384 shading units, 1,024 TMUs, and zero ROPs. The W7900D has 6,144 shading units, 384 TMUs, and 192 ROPs. The MI355X has no listed ray tracing cores, while the W7900D includes 96 RT cores. Neither card lists tensor cores.

Memory architecture is fundamentally different. The MI355X uses HBM3e with a 8192-bit bus and 8.19 TB/s bandwidth. The W7900D uses GDDR6 with a 384-bit bus and 864.0 GB/s bandwidth. The MI355X memory clock is 2000 MHz with 8 Gbps effective transfer, while the W7900D memory runs at 2250 MHz with 18 Gbps effective.

Clock speeds also differ. The MI355X has a 1000 MHz base and 2400 MHz boost. The W7900D has a 1327 MHz base and 2156 MHz boost. The W7900D starts higher but boosts lower, while the MI355X has a wider clock range.

The MI355X uses PCIe 5.0 x16, the W7900D uses PCIe 4.0 x16. The MI355X is an OAM module with no power connectors and no display outputs, dimensions of 102 mm by 165 mm. The W7900D is a triple-slot card, 280 mm long, 110 mm high, 51 mm wide, with 2x 8-pin power connectors and four display outputs.

The Verdict

The data points to two different deployment targets. The MI355X is a compute accelerator for dense numerical workloads. Its 288 GB HBM3e memory, 8.19 TB/s bandwidth, and 78.64 TFLOPS in both FP32 and FP16 place it in a class for large-scale training or inference tasks. It has no display path and no graphics API support, so it cannot drive a monitor or run graphics applications.

The W7900D is a workstation graphics card. Its 52.99 TFLOPS, 48 GB GDDR6, and 414.0 GPixel/s pixel rate, combined with DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 support, make it suitable for professional rendering, visualization, and GPU-accelerated design workflows. The 96 ray tracing cores provide hardware acceleration for ray-traced scenes.

The MI355X wins on raw compute density and memory capacity by wide margins. The W7900D wins on form factor practicality, with a 295 W TDP versus 1400 W, standard PCIe slot mounting versus OAM module, and display outputs. The W7900D also requires a 600 W suggested PSU versus 1800 W.

The choice depends on workload. Compute-heavy tasks with large datasets favor the MI355X. Graphics and display-oriented professional work favors the W7900D. Neither card can substitute for the other in its respective role.

Specification Differences

| Specification | AMD Instinct MI355X | AMD Radeon PRO W7900D |

|---|---|---|

| Architecture | CDNA 4.0 | RDNA 3.0 |

| Process Node | 3 nm | 5 nm |

| Transistors | 185,000 million | 57,700 million |

| Die Size | 2380 mm² | 529 mm² |

| Transistor Density | 77.7M / mm² | 109.1M / mm² |

| Base Clock | 1000 MHz | 1327 MHz |

| Boost Clock | 2400 MHz | 2156 MHz |

| Memory Size | 288 GB | 48 GB |

| Memory Type | HBM3e | GDDR6 |

| Memory Bus Width | 8192 bit | 384 bit |

| Memory Bandwidth | 8.19 TB/s | 864.0 GB/s |

| Memory Clock | 2000 MHz 8 Gbps effective | 2250 MHz 18 Gbps effective |

| Shading Units | 16,384 | 6,144 |

| TMUs | 1,024 | 384 |

| ROPs | 0 | 192 |

| Ray Tracing Cores | None listed | 96 |

| Pixel Rate | 0 MPixel/s | 414.0 GPixel/s |

| Texture Rate | 2,457.6 GTexel/s | 827.9 GTexel/s |

| FP32 | 78.64 TFLOPS | 52.99 TFLOPS |

| FP16 | 78.64 TFLOPS (1:1) | 52.99 TFLOPS (1:1) |

| TDP | 1400 W | 295 W |

| Slot Width | OAM Module | Triple-slot |

| Power Connectors | None | 2x 8-pin |

| Suggested PSU | 1800 W | 600 W |

| Bus Interface | PCIe 5.0 x16 | PCIe 4.0 x16 |

| Display Outputs | No outputs | 3x DisplayPort 2.1, 1x mini-DisplayPort 2.1 |

| DirectX | N/A | 12 Ultimate (12_2) |

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.4 |

| Dimensions | 102 mm x 165 mm | 280 mm x 110 mm x 51 mm |

| Release Date | 2025-06-11 | 2025-09-24 |

| Production Status | Not listed | Active |

Where Each One Wins

The MI355X wins in compute throughput. Its 78.64 TFLOPS in FP32 and FP16 exceeds the W7900D by 48.4% in both precisions. Texture throughput is nearly 3x higher at 2,457.6 GTexel/s. Memory bandwidth is 9.48x higher, and memory capacity is 6x larger. The 8192-bit HBM3e interface provides a massive data pipeline for large models and datasets. The 3 nm process and larger die permit higher transistor counts and more compute units.

The W7900D wins in graphics features. It has 192 ROPs versus zero, a real pixel rate of 414.0 GPixel/s, and 96 ray tracing cores. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the MI355X reports N/A for all graphics APIs. The W7900D provides four display outputs, making it usable as a workstation display adapter.

The W7900D wins on power efficiency and practicality. Its 295 W TDP is 78.9% lower than the MI355X's 1400 W. The suggested PSU is 600 W rather than 1800 W. The triple-slot PCIe form factor fits standard workstation chassis, while the OAM module requires specialized server infrastructure. The W7900D uses standard 2x 8-pin power connectors versus none on the MI355X.

The W7900D also has a higher base clock at 1327 MHz versus 1000 MHz, and a higher memory clock at 2250 MHz versus 2000 MHz, though its boost clock is lower at 2156 MHz versus 2400 MHz. The W7900D has higher transistor density at 109.1M per mm² versus 77.7M per mm².

For workloads that need rendering, display output, or graphics API support, the W7900D is the only viable option. For workloads that need maximum memory capacity, memory bandwidth, or FP32/FP16 compute, the MI355X is the stronger choice. The absence of benchmark data means these conclusions rest on specification analysis, not measured performance.