AMD Instinct MI355X vs Intel Arc Pro B65 Comparison

Where Each One Wins

The AMD Instinct MI355X and Intel Arc Pro B65 occupy entirely different segments of the GPU landscape, and their benchmark profiles reflect that separation. The AMD part is a compute accelerator built for massive parallel workloads, while the Intel part is a professional graphics card aimed at rendering and display-oriented tasks.

Looking at the raw compute metrics, the AMD Instinct MI355X dominates in every throughput category. Its FP32 performance of 78.64 TFLOPS is approximately 6.4 times the Intel Arc Pro B65's 12.29 TFLOPS. In FP16 workloads, the gap narrows slightly but remains substantial: the AMD card delivers 78.64 TFLOPS with a 1:1 ratio, while the Intel card reaches 24.58 TFLOPS using a 2:1 ratio, meaning the AMD part still leads by a factor of roughly 3.2.

Texture processing tells a similar story. The AMD MI355X achieves 2,457.6 GTexel/s, compared to the Intel Arc Pro B65's 384.0 GTexel/s, a difference of about 6.4 times. The AMD card's 16,384 shading units dwarf the Intel card's 2,560, and its 1,024 TMUs versus 160 TMUs reinforces the same conclusion.

However, the Intel Arc Pro B65 wins in one critical area that the AMD part completely lacks: display output. The Intel card provides 4x DisplayPort 2.1 outputs, while the AMD Instinct MI355X has no display outputs at all. For any use case requiring visual output, the Intel card is the only viable option between the two.

The Intel card also carries a pixel rate of 192.0 GPixel/s, while the AMD card's pixel rate is recorded as 0 MPixel/s. This reflects the fundamental design difference: the AMD accelerator has no rasterization pipeline for traditional graphics, whereas the Intel professional GPU is built around it.

Architecture Differences

The architectural divide between these two products is stark. The AMD Instinct MI355X uses the CDNA 4.0 architecture, built on a 3 nm process at TSMC. Its chip, designated MI350 256CU, contains 185,000 million transistors on a 2,380 mm² die, yielding a transistor density of 77.7M per mm². This is a data center accelerator with a thermal design power of 1400 W and an OAM module form factor.

The Intel Arc Pro B65 uses the Xe2-HPG architecture, part of the Battlemage Pro Series. It is fabricated on a 5 nm process at TSMC, with 19,600 million transistors on a 272 mm² die, giving a transistor density of 72.1M per mm². Its TDP is 200 W, and it occupies a dual-slot form factor with a single 8-pin power connector.

Memory configurations differ fundamentally. The AMD card uses 288 GB of HBM3e memory on an 8192-bit bus, delivering 8.19 TB/s of bandwidth. The Intel card uses 32 GB of GDDR6 memory on a 256-bit bus, providing 608.0 GB/s. The AMD part's memory bandwidth is roughly 13.5 times higher, which is consistent with its compute-oriented mission.

Clock behavior also diverges. The AMD MI355X has a base clock of 1000 MHz and a boost clock of 2400 MHz, with memory running at 2000 MHz (8 Gbps effective). The Intel Arc Pro B65 runs at a constant 2400 MHz for both base and boost, with memory at 2375 MHz (19 Gbps effective). The Intel card's higher base clock suggests a more consistent operating profile, while the AMD card relies on boosting to reach peak performance.

The Intel card includes 20 ray tracing cores and 80 ROPs, features absent from the AMD accelerator. Its API support is comprehensive: DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The AMD card lists N/A for all APIs, confirming it is not designed for standard graphics workloads.

Head-to-Head Benchmarks

Direct benchmark comparisons between these two GPUs are unavailable in the database, so the analysis relies on their individual specifications and recorded performance metrics. Both cards sit at the 50th percentile among all GPUs in the database, though this figure likely reflects the absence of benchmark scores for both parts.

The most significant performance gap appears in FP32 compute. The AMD MI355X's 78.64 TFLOPS represents a 6.4x advantage over the Intel Arc Pro B65's 12.29 TFLOPS. This means for any workload that scales with raw floating-point throughput, such as scientific simulation, AI inference, or large-scale matrix operations, the AMD part delivers substantially more processing power per clock.

FP16 performance shows a different ratio. The AMD card maintains 78.64 TFLOPS at a 1:1 ratio, meaning it does not gain additional throughput by using reduced precision. The Intel card achieves 24.58 TFLOPS at a 2:1 ratio, effectively doubling its FP32 rate when using FP16. Even with this advantage, the AMD card still leads by approximately 3.2 times.

Memory bandwidth is where the AMD card's advantage becomes most pronounced. The 8.19 TB/s of the MI355X versus 608.0 GB/s for the Arc Pro B65 gives the AMD part a 13.5x lead. For memory-bound workloads, this difference can be more impactful than raw compute throughput.

The Intel card's strengths appear in rasterization and display. Its 192.0 GPixel/s pixel rate and 80 ROPs enable traditional graphics rendering, while the AMD card's 0 MPixel/s pixel rate means it cannot perform this function at all. The Intel card's 4x DisplayPort 2.1 outputs further cement its role as a display-capable GPU.

Texture fill rates also differ by a factor of 6.4, with the AMD card at 2,457.6 GTexel/s versus 384.0 GTexel/s for the Intel card. This aligns with the shading unit and TMU counts, confirming that the AMD part is designed for massively parallel texture-heavy compute workloads.

FAQ

Q: Which GPU has higher FP32 performance?

A: The AMD Instinct MI355X delivers 78.64 TFLOPS of FP32 compute, which is approximately 6.4 times the Intel Arc Pro B65's 12.29 TFLOPS.

Q: Can either GPU output video to displays?

A: The Intel Arc Pro B65 provides 4x DisplayPort 2.1 outputs. The AMD Instinct MI355X has no display outputs, making it unsuitable for direct visual output.

Q: What memory configurations do these cards use?

A: The AMD card uses 288 GB of HBM3e on an 8192-bit bus with 8.19 TB/s bandwidth. The Intel card uses 32 GB of GDDR6 on a 256-bit bus with 608.0 GB/s bandwidth.

Q: How do their power requirements compare?

A: The AMD Instinct MI355X has a TDP of 1400 W and requires an 1800 W suggested PSU. The Intel Arc Pro B65 has a TDP of 200 W with a 550 W suggested PSU.

Q: What are their respective process nodes and die sizes?

A: The AMD card uses a 3 nm process with a 2,380 mm² die containing 185,000 million transistors. The Intel card uses a 5 nm process with a 272 mm² die containing 19,600 million transistors.

Q: Which GPU supports ray tracing?

A: The Intel Arc Pro B65 includes 20 ray tracing cores. The AMD Instinct MI355X does not list any ray tracing cores.

The Verdict

The data points to two different products for two different jobs. The AMD Instinct MI355X is a compute accelerator with overwhelming advantages in FP32 throughput, FP16 throughput, texture rate, and memory bandwidth. Its 78.64 TFLOPS FP32, 2,457.6 GTexel/s texture rate, and 8.19 TB/s bandwidth place it in a performance class far above the Intel card. For anyone running compute-heavy workloads that do not require display output, the AMD part is the clear choice.

The Intel Arc Pro B65 is a professional graphics card with display outputs, ray tracing cores, and a traditional rasterization pipeline. Its 192.0 GPixel/s pixel rate and 4x DisplayPort 2.1 outputs make it suitable for graphics workloads that require visual output. Its 12.29 TFLOPS FP32 and 24.58 TFLOPS FP16 performance are modest by comparison, but the card is designed for a different purpose entirely.

Neither card has recorded benchmark scores in the database, so the verdict rests on specification analysis. The AMD card's 1400 W TDP and OAM module form factor indicate a data center deployment scenario, while the Intel card's 200 W TDP and dual-slot design with a single 8-pin connector suggest workstation or professional desktop use.

The Intel card's production status is listed as active, while the AMD card's production status is not specified. The Intel card also has a complete API stack, including DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the AMD card lists N/A for all APIs.

For compute density and raw throughput, the AMD Instinct MI355X is the superior part. For graphics rendering, display output, and professional visualization, the Intel Arc Pro B65 is the only option that can perform those tasks.

Specification Differences

| Specification | AMD Instinct MI355X | Intel Arc Pro B65 |

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

| Architecture | CDNA 4.0 | Xe2-HPG |

| Process Node | 3 nm | 5 nm |

| Transistors | 185,000 million | 19,600 million |

| Die Size | 2380 mm² | 272 mm² |

| Transistor Density | 77.7M / mm² | 72.1M / mm² |

| Base Clock | 1000 MHz | 2400 MHz |

| Boost Clock | 2400 MHz | 2400 MHz |

| Memory Clock | 2000 MHz (8 Gbps effective) | 2375 MHz (19 Gbps effective) |

| Memory Size | 288 GB | 32 GB |

| Memory Type | HBM3e | GDDR6 |

| Memory Bus Width | 8192 bit | 256 bit |

| Memory Bandwidth | 8.19 TB/s | 608.0 GB/s |

| Shading Units | 16384 | 2560 |

| TMUs | 1024 | 160 |

| ROPs | 0 | 80 |

| Ray Tracing Cores | None | 20 |

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

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

| FP32 | 78.64 TFLOPS | 12.29 TFLOPS |

| FP16 | 78.64 TFLOPS (1:1) | 24.58 TFLOPS (2:1) |

| TDP | 1400 W | 200 W |

| Slot Width | OAM Module | Dual-slot |

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

| Suggested PSU | 1800 W | 550 W |

| 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 specified | Active |

| Release Date | 2025-06-11 | 2026-03-31 |