AMD Instinct MI455X vs Intel Arc Pro B65 Comparison

AMD Instinct MI455X and Intel Arc Pro B65 represent opposite extremes of the GPU design spectrum. The MI455X is a massive compute accelerator built for data center workloads, while the Arc Pro B65 is a compact professional graphics card for workstations. The recorded data shows no head-to-head benchmarks exist between them, so this analysis relies entirely on their architectural specifications and compute capabilities.

Head-to-Head Benchmarks

The database contains no direct benchmark comparisons between the AMD Instinct MI455X and the Intel Arc Pro B65. Neither product has any recorded benchmark scores, and both hold identical percentile positions at 50th among all GPUs. Their average benchmark scores are zero, indicating no measured performance data has been entered into the database for either card.

The absence of comparative data is expected given their completely different market positions. The MI455X is a data center accelerator with a 2300 W TDP, while the Arc Pro B65 is a 200 W workstation card. These products will never appear in the same test bench under normal circumstances, as they target entirely separate use cases.

Architecture Differences

The architectural split between these two GPUs is substantial. The AMD Instinct MI455X uses the CDNA 5.0 architecture with the MI450 256CU chip, manufactured on a 2 nm TSMC process. The Intel Arc Pro B65 uses the Xe2-HPG architecture with the BMG-G21 chip, also built by TSMC but on a 5 nm process. The MI455X belongs to the Instinct (MIx) generation, while the Arc Pro B65 is part of the Battlemage (Pro Series) generation.

The MI455X integrates 320,000 million transistors across a 2990 mm² die, achieving a transistor density of 107.0M per mm². The Arc Pro B65 contains 19,600 million transistors on a 272 mm² die, with a density of 72.1M per mm². The MI455X has 16.3 times more transistors and a die over 10 times larger, reflecting its role as a compute monster versus a compact professional GPU.

Compute resources differ by an order of magnitude. The MI455X carries 32,768 shading units, 1,024 texture mapping units, and zero ROPs. The Arc Pro B65 has 2,560 shading units, 160 TMUs, and 80 ROPs. The MI455X has 12.8 times more shading units and 6.4 times more TMUs, but the Arc Pro B65 includes 20 ray tracing cores while the MI455X lists none.

Clock behavior also diverges. The MI455X runs at a 1000 MHz base clock with a 2400 MHz boost. The Arc Pro B65 operates at a constant 2400 MHz for both base and boost clocks, meaning it never downclocks under load. The MI455X's boost clock matches the Arc Pro B65's sustained clock, but the AMD part relies on a much higher power envelope to reach that frequency.

Memory architecture could not be more different. The MI455X uses 432 GB of HBM4 memory across a 24,576-bit bus, delivering 23.3 TB/s of bandwidth. The Arc Pro B65 uses 32 GB of GDDR6 memory across a 256-bit bus, providing 608.0 GB/s. The MI455X has 13.5 times more memory capacity and 38.3 times more bandwidth. The AMD card's memory runs at 1900 MHz (7.6 Gbps effective), while Intel's memory runs at 2375 MHz (19 Gbps effective), but the massive bus width difference makes the MI455X overwhelmingly faster in raw bandwidth.

Compute throughput shows the MI455X's dominance. The AMD card delivers 157.3 TFLOPS FP32 and the same 157.3 TFLOPS FP16 at a 1:1 ratio. The Arc Pro B65 delivers 12.29 TFLOPS FP32 and 24.58 TFLOPS FP16 at a 2:1 ratio. The MI455X is 12.8 times faster in FP32 and 6.4 times faster in FP16. Texture rate follows the same pattern: 2,457.6 GTexel/s for AMD versus 384.0 GTexel/s for Intel, a 6.4 times difference. Pixel rate is 0 MPixel/s for the MI455X versus 192.0 GPixel/s for the Arc Pro B65, confirming the AMD part has no rasterization output stage.

API support separates them cleanly. The Arc Pro B65 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI455X lists N/A for DirectX, OpenGL, and Vulkan, indicating it is not designed for traditional graphics API workloads.

Where Each One Wins

The AMD Instinct MI455X wins decisively in every compute-oriented category. Its 157.3 TFLOPS FP32 and FP16 throughput makes it suitable for large-scale scientific computing, AI training, and simulation workloads. The 432 GB HBM4 memory capacity can hold massive datasets that would never fit in the Arc Pro B65's 32 GB. The 23.3 TB/s bandwidth eliminates memory bottlenecks for bandwidth-hungry kernels.

The Intel Arc Pro B65 wins in traditional graphics and workstation scenarios. Its 80 ROPs and 192.0 GPixel/s pixel rate enable actual display output, and the 4x DisplayPort 2.1 outputs connect directly to monitors. The 20 ray tracing cores provide hardware acceleration for ray-traced rendering, which the MI455X lacks entirely. The 12 Ultimate API support means it can run modern graphics applications, while the MI455X has no graphics API support at all.

The Arc Pro B65 is the only one of the two that can function as a visible output device. The MI455X has no display outputs, making it strictly a compute accelerator. The Intel card's 200 W TDP and dual-slot form factor fit into standard workstation builds, while the MI455X's 2300 W TDP and EAM Module slot width require specialized data center infrastructure.

The MI455X uses PCIe 6.0 x16, while the Arc Pro B65 uses PCIe 5.0 x16. The AMD card also specifies a 2700 W suggested PSU, compared to 550 W for the Intel card. The Intel card has a single 8-pin power connector, while the MI455X lists no power connectors, suggesting an external power delivery system.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI455X delivers 157.3 TFLOPS FP32, which is 12.8 times the 12.29 TFLOPS of the Intel Arc Pro B65.

Q: Can the AMD Instinct MI455X output video to a display?

A: No, it has no display outputs and lists N/A for DirectX, OpenGL, and Vulkan support. The Intel Arc Pro B65 has 4x DisplayPort 2.1 outputs.

Q: How do their memory bandwidth figures compare?

A: The MI455X provides 23.3 TB/s using HBM4 memory across a 24,576-bit bus. The Arc Pro B65 provides 608.0 GB/s using GDDR6 memory across a 256-bit bus.

Q: What are the power requirements for each card?

A: The MI455X has a 2300 W TDP and requires a 2700 W suggested PSU. The Arc Pro B65 has a 200 W TDP and requires a 550 W suggested PSU.

Q: Does the Intel Arc Pro B65 support ray tracing?

A: Yes, it includes 20 ray tracing cores. The AMD Instinct MI455X lists no ray tracing cores.

Q: Which GPU has more shading units?

A: The MI455X has 32,768 shading units, compared to 2,560 for the Arc Pro B65, a 12.8 times difference.

Specification Differences

| Specification | AMD Instinct MI455X | Intel Arc Pro B65 |

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

| Architecture | CDNA 5.0 | Xe2-HPG |

| Process Node | 2 nm | 5 nm |

| Transistors | 320,000 million | 19,600 million |

| Die Size | 2990 mm² | 272 mm² |

| Transistor Density | 107.0M / mm² | 72.1M / mm² |

| Base Clock | 1000 MHz | 2400 MHz |

| Boost Clock | 2400 MHz | 2400 MHz |

| Memory Size | 432 GB | 32 GB |

| Memory Type | HBM4 | GDDR6 |

| Memory Bus | 24,576 bit | 256 bit |

| Memory Bandwidth | 23.3 TB/s | 608.0 GB/s |

| Memory Clock | 1900 MHz 7.6 Gbps effective | 2375 MHz 19 Gbps effective |

| Shading Units | 32,768 | 2,560 |

| TMUs | 1,024 | 160 |

| ROPs | 0 | 80 |

| RT Cores | None | 20 |

| Pixel Rate | 0 MPixel/s | 192.0 GPixel/s |

| Texture Rate | 2,457.6 GTexel/s | 384.0 GTexel/s |

| FP32 | 157.3 TFLOPS | 12.29 TFLOPS |

| FP16 | 157.3 TFLOPS (1:1) | 24.58 TFLOPS (2:1) |

| TDP | 2300 W | 200 W |

| Slot Width | EAM Module | Dual-slot |

| Power Connectors | None | 1x 8-pin |

| Suggested PSU | 2700 W | 550 W |

| Bus Interface | PCIe 6.0 x16 | PCIe 5.0 x16 |

| 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 |

| Production Status | Not listed | Active |

| Release Date | 2026-07-22 | 2026-03-31 |

The Verdict

The data supports a clear split based on workload. The AMD Instinct MI455X is the choice for pure compute acceleration where massive memory capacity, extreme bandwidth, and raw FP32/FP16 throughput matter. Its 432 GB HBM4 pool and 23.3 TB/s bandwidth place it in a different class from any workstation GPU, and its 157.3 TFLOPS FP32 output suits large-scale parallel processing.

The Intel Arc Pro B65 is the choice for professional graphics workstations. It has display outputs, ray tracing hardware, full graphics API support, and a power envelope that fits standard systems. Its 192.0 GPixel/s pixel rate and 80 ROPs enable traditional rendering pipelines that the MI455X cannot execute at all.

There is no meaningful competition between these two products. The MI455X cannot display an image, run DirectX applications, or fit in a standard PCIe slot configuration without specialized infrastructure. The Arc Pro B65 cannot approach the compute throughput or memory capacity of the AMD part. The database shows two specialized tools serving different markets, with the AMD card arriving on 2026-07-22 and the Intel card already active since 2026-03-31.