AMD Instinct MI455X vs NVIDIA GB10 Comparison

The Verdict

The database contains no benchmark scores for the AMD Instinct MI455X, while the NVIDIA GB10 has recorded results in two tests. The GB10 achieves a Geekbench OpenCL score of 120137 and a Geekbench Vulkan score of 114648, giving it an average benchmark score of 117393. This places the GB10 in the 95th percentile of all GPUs in the database. The MI455X sits at the 50th percentile with an average score of zero, meaning it has no recorded performance data to compare directly. For any workload measured by the database, the GB10 delivers verified results, while the MI455X remains unverified. The GB10 outperforms its nearest rivals by a narrow margin: it is 0.3% ahead of the NVIDIA RTX 4000 SFF Ada Generation, 2.6% ahead of the NVIDIA Tesla V100 SXM2 16 GB, and 3% ahead of the NVIDIA RTX A5500 Mobile. It trails the AMD Radeon PRO W7700 by 1.3%. The MI455X cannot be recommended for database-verified workloads due to the absence of any benchmark entries. The GB10 is the only option with measurable performance in this comparison.

Architecture Differences

The MI455X uses the MI450 256CU chip built on the CDNA 5.0 architecture, while the GB10 uses the GB20B chip on the Blackwell 2.0 architecture. The MI455X belongs to the Instinct (MIx) generation, and the GB10 belongs to the Server Blackwell (Bxx) generation. Manufacturing processes differ substantially: the MI455X is fabricated on a 2 nm node at TSMC, whereas the GB10 uses a 5 nm node at TSMC. The MI455X die measures 2990 mm² and contains 320,000 million transistors, achieving a density of 107.0M transistors per mm². The GB10 die is 382 mm², and its transistor count is listed as unknown in the database. Clock behavior also differs. The MI455X has a base clock of 1000 MHz and a boost clock of 2400 MHz. The GB10 has a higher base clock of 1665 MHz and a boost clock of 2418 MHz. The MI455X memory runs at 1900 MHz with 7.6 Gbps effective speed, while the GB10 memory runs at 1067 MHz with 8.5 Gbps effective speed. The MI455X has no display outputs, and the GB10 includes 1x HDMI. The GB10 is an IGP (integrated graphics processor) with dimensions of 150 mm length, 51 mm height, and 150 mm width. The MI455X is an EAM Module. The GB10 is marked as Active in production status, while the MI455X has no production status recorded. The GB10 lists a predecessor of Server Hopper and a successor of Server Rubin. The MI455X lists a predecessor of Radeon Instinct and no successor. Release dates differ: the GB10 released on 2025-10-14, and the MI455X released on 2026-07-22.

FAQ

Q: Which GPU has a higher recorded benchmark score?

A: The NVIDIA GB10 has recorded scores of 120137 in Geekbench OpenCL and 114648 in Geekbench Vulkan, with an average of 117393. The AMD Instinct MI455X has no benchmark entries, so its average score is zero.

Q: How does the GB10 compare to its nearest rivals?

A: The GB10 is 0.3% ahead of the NVIDIA RTX 4000 SFF Ada Generation, 2.6% ahead of the NVIDIA Tesla V100 SXM2 16 GB, and 3% ahead of the NVIDIA RTX A5500 Mobile. It is 1.3% behind the AMD Radeon PRO W7700.

Q: What are the memory configurations of each GPU?

A: The MI455X has 432 GB of HBM4 memory on a 24576-bit bus with 23.3 TB/s bandwidth. The GB10 has 128 GB of LPDDR5X memory on a 256-bit bus with 273.2 GB/s bandwidth.

Q: Which GPU has more shading units and texture units?

A: The MI455X has 32768 shading units and 1024 TMUs. The GB10 has 6144 shading units and 384 TMUs. The MI455X also has a texture rate of 2,457.6 GTexel/s versus 928.5 GTexel/s for the GB10.

Q: What is the power requirement difference?

A: The MI455X has a TDP of 2300 W and a suggested PSU of 2700 W. The GB10 has a TDP of 140 W and a suggested PSU of 300 W.

Q: When did each GPU release?

A: The NVIDIA GB10 released on 2025-10-14. The AMD Instinct MI455X released on 2026-07-22.

Specification Differences

| Field | AMD Instinct MI455X | NVIDIA GB10 |

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

| Chip | MI450 256CU | GB20B |

| Architecture | CDNA 5.0 | Blackwell 2.0 |

| Generation | Instinct (MIx) | Server Blackwell (Bxx) |

| Process Node | 2 nm | 5 nm |

| Transistors | 320,000 million | unknown |

| Die Size | 2990 mm² | 382 mm² |

| Transistor Density | 107.0M / mm² | null |

| Base Clock | 1000 MHz | 1665 MHz |

| Boost Clock | 2400 MHz | 2418 MHz |

| Memory Clock | 1900 MHz 7.6 Gbps effective | 1067 MHz 8.5 Gbps effective |

| Memory Size | 432 GB | 128 GB |

| Memory Type | HBM4 | LPDDR5X |

| Bus Width | 24576 bit | 256 bit |

| Bandwidth | 23.3 TB/s | 273.2 GB/s |

| Shading Units | 32768 | 6144 |

| TMUs | 1024 | 384 |

| ROPs | 0 | 48 |

| RT Cores | null | 48 |

| Tensor Cores | null | 384 |

| Pixel Rate | 0 MPixel/s | 116.1 GPixel/s |

| Texture Rate | 2,457.6 GTexel/s | 928.5 GTexel/s |

| FP32 | 157.3 TFLOPS | 29.71 TFLOPS |

| FP16 | 157.3 TFLOPS (1:1) | 29.71 TFLOPS (1:1) |

| TDP | 2300 W | 140 W |

| Slot Width | EAM Module | IGP |

| Suggested PSU | 2700 W | 300 W |

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

| Display Outputs | No outputs | 1x HDMI |

| Dimensions | null | 150 mm 5.9 inches, 51 mm 2 inches, 150 mm 5.9 inches |

| Production Status | null | Active |

| Release Date | 2026-07-22 | 2025-10-14 |

| Predecessor | Radeon Instinct | Server Hopper |

| Successor | null | Server Rubin |

| Launch MSRP | null | 3,999 USD |

Head-to-Head Benchmarks

The head-to-head benchmark table in the database is empty, so no direct paired measurements exist between these two GPUs. However, the GB10 has standalone scores that can be interpreted. In Geekbench OpenCL, the GB10 scores 120137. In Geekbench Vulkan, it scores 114648. The OpenCL result is 5489 points higher than the Vulkan result, indicating a measurable performance difference between the two API paths on the same hardware. The average benchmark score for the GB10 is 117393.

The MI455X has no recorded benchmarks, so its performance cannot be quantified from the database. Its theoretical specifications indicate a much larger compute configuration: 32768 shading units versus 6144, 1024 TMUs versus 384, and FP32 throughput of 157.3 TFLOPS versus 29.71 TFLOPS. The texture rate is 2,457.6 GTexel/s versus 928.5 GTexel/s. The pixel rate is zero for the MI455X, while the GB10 delivers 116.1 GPixel/s. The MI455X has no ROPs, while the GB10 has 48. The MI455X has no RT cores or tensor cores listed, while the GB10 has 48 RT cores and 384 tensor cores. Memory bandwidth differs by an order of magnitude: 23.3 TB/s versus 273.2 GB/s. The bus width is 24576 bit versus 256 bit. These figures describe hardware capability, but they do not translate into verified performance scores because the database lacks any benchmark results for the MI455X.

The GB10 percentile of 95 indicates it ranks above the vast majority of GPUs in the database. Its nearest rivals are all within a 3% band, confirming that its performance is competitive but not dominant. The RTX 4000 SFF Ada Generation scores 117088, which is 0.3% lower than the GB10. The Tesla V100 SXM2 16 GB scores 114395, which is 2.6% lower. The RTX A5500 Mobile scores 113944, which is 3% lower. The Radeon PRO W7700 scores 118976, which is 1.3% higher. None of these rivals come close to the MI455X in terms of raw compute specifications, but the MI455X has no benchmark evidence to support any performance claim. The data shows that the GB10 is a verified performer in the 95th percentile, while the MI455X remains an unmeasured entry with no recorded wins in the database.