AMD Instinct MI455X vs AMD Radeon PRO W7400 Comparison

Head-to-Head Benchmarks

The database contains no recorded benchmark scores for either the AMD Instinct MI455X or the AMD Radeon PRO W7400. Both products have an average benchmark score of 0 and a percentile rank of 50 against all GPUs. With zero head-to-head benchmark entries, the wins column shows 0 for both cards, meaning no direct performance comparison can be drawn from recorded measurements.

The absence of benchmark data is not unusual for professional and accelerator products, as these are often tested in specialized workloads that do not feed into generalized gaming or consumer benchmark suites. The Instinct MI455X targets compute acceleration, while the Radeon PRO W7400 targets professional visualization. Neither has entries in the standard head-to-head matrix.

Where Each One Wins

Without benchmark scores, the wins must be inferred from the recorded hardware specifications. The Instinct MI455X shows a massive raw compute advantage on paper. Its FP32 throughput is listed at 157.3 TFLOPS, which is 20 times the 7.885 TFLOPS of the Radeon PRO W7400. Texture rate follows a similar pattern: 2,457.6 GTexel/s versus 123.2 GTexel/s. These figures indicate the MI455X is built for dense parallel math, AI training, and simulation workloads.

The Radeon PRO W7400 counters with capabilities the MI455X does not have at all. The MI455X lists zero pixel rate, zero ROPs, and no display outputs. The W7400 has a 70.40 GPixel/s pixel rate, 64 ROPs, and four DisplayPort 2.1 outputs. This makes the W7400 the only one of the two that can drive monitors, render to screen, or be used in a standard workstation desktop environment.

The memory configuration further separates their roles. The MI455X uses 432 GB of HBM4 with a 24,576-bit bus and 23.3 TB/s bandwidth. The W7400 has 8 GB of GDDR6 on a 128-bit bus with 172.8 GB/s. For datasets that fit in 8 GB, the W7400 is sufficient; for multi-terabyte model training or large-scale scientific computing, the MI455X's capacity and bandwidth are orders of magnitude higher.

Power draw tells a practical story. The MI455X lists a TDP of 2300 W with a suggested PSU of 2700 W. The W7400 lists 55 W with a 250 W suggested PSU. This difference matters for system integration: the MI455X requires industrial power delivery and cooling, while the W7400 can operate in a standard workstation slot.

Architecture Differences

The two cards represent entirely different AMD architectures. The Instinct MI455X uses CDNA 5.0, built for compute accelerators. The Radeon PRO W7400 uses RDNA 3.0, designed for graphics and professional rendering. The codenames differ as well: the W7400 is "Hotpink Bonefish," while the MI455X has no codename listed.

The manufacturing process separates them clearly. The MI455X uses a 2 nm process at TSMC, while the W7400 uses a 6 nm process at the same foundry. Transistor counts reflect the scale difference: the MI455X packs 320,000 million transistors on a 2,990 mm² die, giving a transistor density of 107.0M per mm². The W7400 has 13,300 million transistors on 204 mm², with 65.2M per mm². The MI455X die is nearly 15 times larger physically.

Memory architecture is radically different. The MI455X uses HBM4 with a 24,576-bit bus, while the W7400 uses GDDR6 with a 128-bit bus. The MI455X memory clock is listed at 1900 MHz with 7.6 Gbps effective, whereas the W7400 runs at 1350 MHz with 10.8 Gbps effective. The W7400's faster per-pin data rate does not compensate for the much narrower bus.

The compute core layout differs in scale. The MI455X has 32,768 shading units and 1,024 TMUs. The W7400 has 1,792 shading units, 112 TMUs, and 64 ROPs. The MI455X has zero ROPs listed, consistent with a compute-only accelerator. The W7400 has 28 ray tracing cores; the MI455X lists none.

Clock speeds show different design priorities. The MI455X base clock is 1000 MHz with a 2400 MHz boost. The W7400 base is 330 MHz with a 1100 MHz boost. Despite the lower clocks, the W7400 has a much lower power envelope, indicating the RDNA 3.0 design favors efficiency per watt.

The bus interface also differs. The MI455X uses PCIe 6.0 x16, while the W7400 uses PCIe 4.0 x8. This affects host transfer bandwidth and system compatibility. The MI455X requires a newer platform to utilize its full interface speed.

The Verdict

The data shows two products with no overlap in intended use. The Instinct MI455X is a compute accelerator with no display outputs, zero pixel rate, and a 2300 W power draw. Its 432 GB HBM4 memory and 157.3 TFLOPS FP32 rate position it for large-scale AI, scientific, and data-center workloads. The Radeon PRO W7400 is a professional graphics card with four DisplayPort 2.1 outputs, 70.40 GPixel/s pixel rate, and 55 W power draw, suited for CAD, content creation, and multi-monitor professional work.

Users who need to render frames to a screen, run OpenGL or Vulkan applications, or use DirectX 12 Ultimate features must choose the W7400, as the MI455X lists N/A for all three APIs. Users who need massive memory capacity and compute throughput, and who have the infrastructure for high-power accelerators, should consider the MI455X.

The power difference is extreme: 2300 W versus 55 W. This alone determines system feasibility in most environments. A standard workstation can handle the W7400 with its 250 W suggested PSU. The MI455X requires a 2700 W PSU and likely specialized cooling and power delivery.

Neither card has a launch MSRP listed in the database, so cost comparison is not possible from recorded data. The performance data is also absent, so final purchasing decisions must rely on the specification differences outlined here.

FAQ

Q: Which card has more FP32 compute power?

A: The Instinct MI455X lists 157.3 TFLOPS FP32, while the Radeon PRO W7400 lists 7.885 TFLOPS. The MI455X has about 20 times the raw FP32 throughput.

Q: Can the Instinct MI455X drive a display?

A: No. The database lists "No outputs" for display outputs, zero pixel rate, and N/A for DirectX, OpenGL, and Vulkan APIs. The Radeon PRO W7400 has four DisplayPort 2.1 outputs and supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Q: What is the memory capacity difference?

A: The MI455X has 432 GB of HBM4 with a 24,576-bit bus and 23.3 TB/s bandwidth. The W7400 has 8 GB of GDDR6 on a 128-bit bus with 172.8 GB/s bandwidth.

Q: How do their power requirements compare?

A: The MI455X lists a TDP of 2300 W and a suggested PSU of 2700 W. The W7400 lists 55 W TDP and a suggested PSU of 250 W. The difference is 2245 W in TDP.

Q: Which card supports ray tracing?

A: Only the Radeon PRO W7400 lists ray tracing cores, with 28 RT cores. The Instinct MI455X has no ray tracing core count listed.

Q: What are the physical form factors?

A: The MI455X is an EAM Module with no dimensions listed. The W7400 is a single-slot card measuring 168 mm length, 69 mm height, and 20 mm width.

Specification Differences

| Field | AMD Instinct MI455X | AMD Radeon PRO W7400 |

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

| Architecture | CDNA 5.0 | RDNA 3.0 |

| Process Node | 2 nm | 6 nm |

| Transistors | 320,000 million | 13,300 million |

| Die Size | 2990 mm² | 204 mm² |

| Transistor Density | 107.0M / mm² | 65.2M / mm² |

| Base Clock | 1000 MHz | 330 MHz |

| Boost Clock | 2400 MHz | 1100 MHz |

| Memory Clock | 1900 MHz 7.6 Gbps effective | 1350 MHz 10.8 Gbps effective |

| Memory Size | 432 GB | 8 GB |

| Memory Type | HBM4 | GDDR6 |

| Memory Bus Width | 24576 bit | 128 bit |

| Memory Bandwidth | 23.3 TB/s | 172.8 GB/s |

| Shading Units | 32768 | 1792 |

| TMUs | 1024 | 112 |

| ROPs | 0 | 64 |

| RT Cores | None listed | 28 |

| Pixel Rate | 0 MPixel/s | 70.40 GPixel/s |

| Texture Rate | 2,457.6 GTexel/s | 123.2 GTexel/s |

| FP32 | 157.3 TFLOPS | 7.885 TFLOPS |

| FP16 | 157.3 TFLOPS (1:1) | 7.885 TFLOPS (1:1) |

| TDP | 2300 W | 55 W |

| Slot Width | EAM Module | Single-slot |

| Power Connectors | None | None |

| Suggested PSU | 2700 W | 250 W |

| Bus Interface | PCIe 6.0 x16 | PCIe 4.0 x8 |

| Display Outputs | No outputs | 4x DisplayPort 2.1 |

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

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.4 |

| Release Date | 2026-07-22 | 2025-08-02 |

| Production Status | Not listed | Active |