AMD Instinct MI455X vs NVIDIA RTX 5000 Ada Generation Comparison

Head-to-Head Benchmarks

The recorded data shows no direct head-to-head benchmark results between the AMD Instinct MI455X and the NVIDIA RTX 5000 Ada Generation. The AMD Instinct MI455X has no benchmark scores listed in the database, placing it at the 50th percentile of all GPUs with an average benchmark score of 0. The NVIDIA RTX 5000 Ada Generation, by contrast, has two recorded benchmark tests: a Geekbench OpenCL score of 175286 and a Geekbench Vulkan score of 194041, producing an average benchmark score of 184664 and placing it at the 98th percentile of all GPUs.

The absence of measured performance data for the MI455X means the database cannot directly compare these two accelerators through benchmark results. The NVIDIA part's average score sits 0.5% above the NVIDIA A100 SXM4 80 GB, which scored 183725. The RTX 5000 Ada Generation also leads the NVIDIA A100 SXM4 40 GB by 1.3%, as that rival scored 187147. Against the NVIDIA RTX PRO 5000 Blackwell, which scored 182109, the RTX 5000 Ada Generation is 1.4% ahead. The largest margin among its nearest rivals is against the NVIDIA GeForce RTX 4090 D, where the RTX 5000 Ada Generation leads by 3.7% with that card scoring 178050.

The MI455X's 50th percentile placement with zero recorded benchmark scores indicates that the database has no verified performance measurements for this accelerator. Without benchmark data, any performance comparison between the MI455X and the RTX 5000 Ada Generation must rely on architectural and specification differences rather than measured results.

Architecture Differences

The AMD Instinct MI455X uses the MI450 256CU chip built on CDNA 5.0 architecture, manufactured on a 2 nm process at TSMC. The NVIDIA RTX 5000 Ada Generation uses the AD102 chip built on Ada Lovelace architecture, also manufactured at TSMC but on a 5 nm process. The MI455X belongs to the Instinct (MIx) generation, while the RTX 5000 Ada Generation belongs to the Workstation Ada generation within the GeForce 50-series product line.

Transistor counts differ substantially. The MI455X integrates 320,000 million transistors on a die size of 2990 mm², giving a transistor density of 107.0M per mm². The RTX 5000 Ada Generation integrates 76,300 million transistors on a 609 mm² die, resulting in a higher transistor density of 125.3M per mm². The MI455X's die is roughly five times larger, but the RTX 5000 Ada Generation packs transistors more densely.

Memory subsystems diverge completely. The MI455X uses 432 GB of HBM4 memory on a 24576-bit bus, delivering 23.3 TB/s of bandwidth. The RTX 5000 Ada Generation uses 32 GB of GDDR6 memory on a 256-bit bus, delivering 576.0 GB/s of bandwidth. The MI455X's memory bandwidth is over 40 times higher, and its memory capacity is over 13 times larger. The MI455X runs memory at 1900 MHz with 7.6 Gbps effective speed, while the RTX 5000 Ada Generation runs memory at 2250 MHz with 18 Gbps effective speed.

Compute resources also differ markedly. The MI455X has 32768 shading units, 1024 texture mapping units, and 0 ROPs, with a pixel rate of 0 MPixel/s. The RTX 5000 Ada Generation has 12800 shading units, 400 texture mapping units, and 176 ROPs, with a pixel rate of 448.8 GPixel/s. The MI455X delivers 2,457.6 GTexel/s of texture rate versus 1,020.0 GTexel/s for the RTX 5000 Ada Generation. FP32 performance reaches 157.3 TFLOPS on the MI455X and 65.28 TFLOPS on the RTX 5000 Ada Generation. Both parts deliver FP16 at a 1:1 ratio with FP32.

The RTX 5000 Ada Generation includes 100 ray tracing cores and 400 tensor cores, features absent from the MI455X's specification sheet. Clock speeds show the MI455X with a 1000 MHz base and 2400 MHz boost, while the RTX 5000 Ada Generation runs at 1155 MHz base and 2550 MHz boost. The RTX 5000 Ada Generation supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the MI455X lists N/A for all three APIs.

Power and physical specifications separate these parts further. The MI455X has a TDP of 2300 W with a suggested PSU of 2700 W, uses an EAM Module slot width, and has no power connectors. The RTX 5000 Ada Generation has a TDP of 250 W with a suggested PSU of 600 W, uses a dual-slot form factor, and requires a single 16-pin power connector. The MI455X measures no display outputs, while the RTX 5000 Ada Generation provides 4x DisplayPort 1.4a outputs. The RTX 5000 Ada Generation has physical dimensions of 267 mm length and 112 mm height. The MI455X has no recorded dimensions.

Bus interfaces also differ: the MI455X uses PCIe 6.0 x16, while the RTX 5000 Ada Generation uses PCIe 4.0 x16. Release dates show the RTX 5000 Ada Generation launched on 2023-08-08, while the MI455X launched on 2026-07-22. The MI455X's predecessor is listed as Radeon Instinct, while the RTX 5000 Ada Generation's predecessor is Workstation Ampere and its successor is Blackwell PRO W. The production status is listed as Active for the RTX 5000 Ada Generation and null for the MI455X.

FAQ

Q: Which accelerator has more FP32 computing power?

A: The AMD Instinct MI455X delivers 157.3 TFLOPS of FP32 performance, which is more than double the 65.28 TFLOPS delivered by the NVIDIA RTX 5000 Ada Generation.

Q: What is the memory bandwidth difference between these two accelerators?

A: The AMD Instinct MI455X provides 23.3 TB/s of bandwidth through 432 GB of HBM4 memory on a 24576-bit bus. The NVIDIA RTX 5000 Ada Generation provides 576.0 GB/s through 32 GB of GDDR6 memory on a 256-bit bus.

Q: Does the NVIDIA RTX 5000 Ada Generation support ray tracing?

A: Yes, the RTX 5000 Ada Generation includes 100 ray tracing cores and 400 tensor cores. The AMD Instinct MI455X specification sheet lists no ray tracing cores or tensor cores.

Q: What benchmark scores does the AMD Instinct MI455X have?

A: The database records zero benchmark scores for the MI455X, placing it at the 50th percentile of all GPUs with an average benchmark score of 0. The RTX 5000 Ada Generation has a Geekbench OpenCL score of 175286 and a Geekbench Vulkan score of 194041.

Q: What is the power consumption difference?

A: The AMD Instinct MI455X has a TDP of 2300 W with a suggested PSU of 2700 W. The NVIDIA RTX 5000 Ada Generation has a TDP of 250 W with a suggested PSU of 600 W.

Q: Which accelerator has a higher transistor density?

A: The NVIDIA RTX 5000 Ada Generation has a transistor density of 125.3M per mm², which is higher than the AMD Instinct MI455X's 107.0M per mm². However, the MI455X contains 320,000 million total transistors versus 76,300 million for the RTX 5000 Ada Generation.

Specification Differences

| Specification | AMD Instinct MI455X | NVIDIA RTX 5000 Ada Generation |

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

| Architecture | CDNA 5.0 | Ada Lovelace |

| Process node | 2 nm | 5 nm |

| Transistors | 320,000 million | 76,300 million |

| Die size | 2990 mm² | 609 mm² |

| Transistor density | 107.0M / mm² | 125.3M / mm² |

| Base clock | 1000 MHz | 1155 MHz |

| Boost clock | 2400 MHz | 2550 MHz |

| Memory clock | 1900 MHz 7.6 Gbps effective | 2250 MHz 18 Gbps effective |

| Memory size | 432 GB | 32 GB |

| Memory type | HBM4 | GDDR6 |

| Memory bus width | 24576 bit | 256 bit |

| Memory bandwidth | 23.3 TB/s | 576.0 GB/s |

| Shading units | 32768 | 12800 |

| TMUs | 1024 | 400 |

| ROPs | 0 | 176 |

| Ray tracing cores | Not listed | 100 |

| Tensor cores | Not listed | 400 |

| Pixel rate | 0 MPixel/s | 448.8 GPixel/s |

| Texture rate | 2,457.6 GTexel/s | 1,020.0 GTexel/s |

| FP32 | 157.3 TFLOPS | 65.28 TFLOPS |

| FP16 | 157.3 TFLOPS (1:1) | 65.28 TFLOPS (1:1) |

| TDP | 2300 W | 250 W |

| Slot width | EAM Module | Dual-slot |

| Power connectors | None | 1x 16-pin |

| Suggested PSU | 2700 W | 600 W |

| Bus interface | PCIe 6.0 x16 | PCIe 4.0 x16 |

| Display outputs | No outputs | 4x DisplayPort 1.4a |

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

| OpenGL support | N/A | 4.6 |

| Vulkan support | N/A | 1.4 |

| Length | Not recorded | 267 mm, 10.5 inches |

| Height | Not recorded | 112 mm, 4.4 inches |

| Release date | 2026-07-22 | 2023-08-08 |

| Predecessor | Radeon Instinct | Workstation Ampere |

| Successor | Not recorded | Blackwell PRO W |

| Production status | Not recorded | Active |

Where Each One Wins

The AMD Instinct MI455X dominates in raw compute throughput and memory capacity. Its FP32 performance of 157.3 TFLOPS is 2.4 times the RTX 5000 Ada Generation's 65.28 TFLOPS. The MI455X's texture rate of 2,457.6 GTexel/s more than doubles the RTX 5000 Ada Generation's 1,020.0 GTexel/s. Memory bandwidth of 23.3 TB/s versus 576.0 GB/s represents a decisive advantage for workloads that move large datasets, and the 432 GB capacity versus 32 GB allows the MI455X to hold far larger working sets in local memory. The PCIe 6.0 x16 interface provides a newer bus standard than the RTX 5000 Ada Generation's PCIe 4.0 x16.

The NVIDIA RTX 5000 Ada Generation wins in several operational categories. Its TDP of 250 W versus 2300 W means the RTX 5000 Ada Generation requires far less power and a smaller suggested PSU (600 W versus 2700 W). The dual-slot form factor with a single 16-pin power connector makes it far easier to install in standard workstation chassis compared to the EAM Module slot width with no power connectors on the MI455X. The RTX 5000 Ada Generation provides 4x DisplayPort 1.4a outputs, while the MI455X has no display outputs. The RTX 5000 Ada Generation includes 100 ray tracing cores and 400 tensor cores, enabling ray tracing and tensor operations that the MI455X does not list. The RTX 5000 Ada Generation also supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the MI455X lists N/A for all three APIs.

The RTX 5000 Ada Generation has recorded benchmark scores that place it at the 98th percentile of all GPUs, with an average score of 184664. The MI455X has no recorded benchmark scores and sits at the 50th percentile. The RTX 5000 Ada Generation also has a higher boost clock (2550 MHz versus 2400 MHz), a higher base clock (1155 MHz versus 1000 MHz), and a higher transistor density (125.3M per mm² versus 107.0M per mm²). The RTX 5000 Ada Generation has been on the market since 2023 with an Active production status, while the MI455X's production status is not recorded.

The MI455X targets workloads where massive memory capacity and extreme bandwidth are paramount, such as large-scale training or inference with datasets that exceed 32 GB. The RTX 5000 Ada Generation targets workloads that require graphics output, ray tracing, tensor operations, standard PCIe compatibility, and manageable power draw. The MI455X's 2 nm process node and CDNA 5.0 architecture represent newer technology, but the RTX 5000 Ada Generation's measured benchmark performance and established production status give it a verified performance profile in the database.