AMD Instinct MI455X vs NVIDIA GeForce RTX 5070 Ti Comparison

FAQ

Q: What are the core architectural identities of the AMD Instinct MI455X and NVIDIA GeForce RTX 5070 Ti?

A: The AMD Instinct MI455X uses the CDNA 5.0 architecture with a 2 nm process node from TSMC, built on the MI450 256CU chip. The NVIDIA GeForce RTX 5070 Ti uses the Blackwell 2.0 architecture with a 5 nm process node, also from TSMC, built on the GB203 chip.

Q: How do the memory subsystems compare between the two cards?

A: The AMD Instinct MI455X carries 432 GB of HBM4 memory on a 24576-bit bus, delivering 23.3 TB/s bandwidth. The NVIDIA GeForce RTX 5070 Ti carries 16 GB of GDDR7 memory on a 256-bit bus, delivering 896.0 GB/s bandwidth.

Q: Which card has higher raw compute throughput in FP32 operations?

A: The AMD Instinct MI455X delivers 157.3 TFLOPS in FP32, which is 3.58 times higher than the NVIDIA GeForce RTX 5070 Ti's 43.94 TFLOPS. Both cards achieve a 1:1 ratio for FP16 performance.

Q: What is the thermal design power difference between the two products?

A: The AMD Instinct MI455X has a TDP of 2300 W with a suggested PSU of 2700 W, while the NVIDIA GeForce RTX 5070 Ti has a TDP of 300 W with a suggested PSU of 700 W.

Q: What is the performance percentile ranking for each GPU in the database?

A: The AMD Instinct MI455X sits at the 50th percentile among all GPUs, with an average benchmark score of 0 from no recorded benchmarks. The NVIDIA GeForce RTX 5070 Ti sits at the 86th percentile, with an average benchmark score of 49957.

Q: What is the physical form factor difference between the two cards?

A: The AMD Instinct MI455X is an EAM Module with no display outputs and no power connectors. The NVIDIA GeForce RTX 5070 Ti is a dual-slot card measuring 304 mm by 137 mm by 48 mm, with 1x HDMI 2.1b and 3x DisplayPort 2.1b outputs, powered by a single 16-pin connector.

Architecture Differences

The AMD Instinct MI455X and NVIDIA GeForce RTX 5070 Ti represent fundamentally different design philosophies. The MI455X is a compute-oriented accelerator using CDNA 5.0, while the RTX 5070 Ti is a graphics-oriented consumer card using Blackwell 2.0. The process nodes differ significantly: the MI455X uses a 2 nm TSMC process, whereas the RTX 5070 Ti uses a 5 nm TSMC process. This contributes to a massive difference in transistor counts: the MI455X packs 320,000 million transistors on a 2990 mm² die, while the RTX 5070 Ti contains 45,600 million transistors on a 378 mm² die. The transistor density tells a different story: the RTX 5070 Ti achieves 120.6M transistors per mm², higher than the MI455X's 107.0M per mm², indicating the smaller chip is more densely packed relative to its area.

The execution resources diverge sharply. The MI455X contains 32768 shading units and 1024 TMUs, with zero ROPs and a pixel rate of 0 MPixel/s, confirming it is not designed for rasterization output. The RTX 5070 Ti has 8960 shading units, 280 TMUs, and 96 ROPs, with a pixel rate of 235.4 GPixel/s. The MI455X has no RT cores or tensor cores listed, while the RTX 5070 Ti includes 70 RT cores and 280 tensor cores. The texture rates reflect the compute focus of the MI455X: 2,457.6 GTexel/s versus 686.6 GTexel/s for the RTX 5070 Ti.

Memory architecture separates the two further. The MI455X uses HBM4 with 432 GB capacity, a 24576-bit bus, and 23.3 TB/s bandwidth. The RTX 5070 Ti uses GDDR7 with 16 GB capacity, a 256-bit bus, and 896.0 GB/s bandwidth. Clock speeds also differ: the MI455X runs at a 1000 MHz base and 2400 MHz boost, with memory at 1900 MHz (7.6 Gbps effective). The RTX 5070 Ti runs at 2295 MHz base and 2452 MHz boost, with memory at 1750 MHz (28 Gbps effective).

The bus interfaces differ as well. The MI455X uses PCIe 6.0 x16, while the RTX 5070 Ti uses PCIe 5.0 x16. API support is absent on the MI455X, with DirectX, OpenGL, and Vulkan all listed as N/A. The RTX 5070 Ti supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI455X is an EAM Module with no display outputs and no power connectors, whereas the RTX 5070 Ti is a dual-slot card with standard display outputs and a single 16-pin power connector. Release dates place the RTX 5070 Ti on 2025-02-19, with the MI455X following on 2026-07-22.

The Verdict

The data indicates these two products should not be considered direct competitors. The AMD Instinct MI455X is a compute accelerator with no display outputs, no rasterization hardware (0 ROPs, 0 MPixel/s pixel rate), and no graphics API support. The NVIDIA GeForce RTX 5070 Ti is a consumer graphics card with full display outputs, 96 ROPs, and complete DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 support.

For workloads that demand massive parallel compute and enormous memory capacity, the MI455X holds clear advantages. Its 432 GB of HBM4 memory dwarfs the RTX 5070 Ti's 16 GB, and its 23.3 TB/s bandwidth is 26 times higher. The FP32 throughput of 157.3 TFLOPS versus 43.94 TFLOPS shows the MI455X delivers 3.58 times the compute performance. The 2300 W TDP and 2700 W suggested PSU indicate this is a data center part requiring specialized infrastructure.

For graphics rendering, gaming, and any workload requiring display output or ray tracing, the RTX 5070 Ti is the only viable option from these two. Its 70 RT cores and 280 tensor cores enable hardware-accelerated ray tracing and AI features. Its 235.4 GPixel/s pixel rate and 686.6 GTexel/s texture rate provide real rasterization capability. The RTX 5070 Ti also holds a substantial percentile advantage: 86th percentile versus 50th for the MI455X, though this reflects the absence of benchmark scores for the MI455X.

The benchmark data confirms the RTX 5070 Ti's position in the database. Its average benchmark score of 49957 places it within 0.1% of the AMD Radeon RX Vega 64 (50001), 0.4% ahead of the Intel Arc A550M (49737), 2% behind the AMD Radeon RX 6900 XT (50951), and 3.1% ahead of the AMD Radeon RX 6800 XT (48477). The MI455X has no recorded benchmarks, so its performance cannot be compared directly in the database.

The verdict is clear: choose the MI455X for memory-bound compute tasks where its 432 GB capacity and 23.3 TB/s bandwidth are essential. Choose the RTX 5070 Ti for any graphics workload, given its display outputs, ray tracing hardware, and complete API support. The two cards serve entirely different market segments, and the recorded data shows no overlap in their intended use cases.

Specification Differences

| Specification | AMD Instinct MI455X | NVIDIA GeForce RTX 5070 Ti |

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

| Architecture | CDNA 5.0 | Blackwell 2.0 |

| Process node | 2 nm | 5 nm |

| Transistors | 320,000 million | 45,600 million |

| Die size | 2990 mm² | 378 mm² |

| Transistor density | 107.0M / mm² | 120.6M / mm² |

| Base clock | 1000 MHz | 2295 MHz |

| Boost clock | 2400 MHz | 2452 MHz |

| Memory clock | 1900 MHz, 7.6 Gbps effective | 1750 MHz, 28 Gbps effective |

| Memory size | 432 GB | 16 GB |

| Memory type | HBM4 | GDDR7 |

| Memory bus | 24576 bit | 256 bit |

| Memory bandwidth | 23.3 TB/s | 896.0 GB/s |

| Shading units | 32768 | 8960 |

| TMUs | 1024 | 280 |

| ROPs | 0 | 96 |

| RT cores | N/A | 70 |

| Tensor cores | N/A | 280 |

| Pixel rate | 0 MPixel/s | 235.4 GPixel/s |

| Texture rate | 2,457.6 GTexel/s | 686.6 GTexel/s |

| FP32 | 157.3 TFLOPS | 43.94 TFLOPS |

| FP16 | 157.3 TFLOPS (1:1) | 43.94 TFLOPS (1:1) |

| TDP | 2300 W | 300 W |

| Slot width | EAM Module | Dual-slot |

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

| Suggested PSU | 2700 W | 700 W |

| Bus interface | PCIe 6.0 x16 | PCIe 5.0 x16 |

| Display outputs | No outputs | 1x HDMI 2.1b, 3x DisplayPort 2.1b |

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

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.4 |

| Release date | 2026-07-22 | 2025-02-19 |

| Launch MSRP | None | 749 USD |

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark results between the AMD Instinct MI455X and NVIDIA GeForce RTX 5070 Ti. The MI455X has zero recorded benchmarks and an average benchmark score of 0, while the RTX 5070 Ti has ten recorded benchmark scores. The wins count in the database stands at 0 for each product, reflecting the absence of direct comparisons.

For the RTX 5070 Ti, the recorded benchmark scores provide context for its performance tier. In 3DMark Steel Nomad DX12, it scores 6604. Geekbench results show 212363 in OpenCL and 225122 in Vulkan. Passmark results include 192 for DirectX 10, 300 for DirectX 11, 127 for DirectX 12, 351 for DirectX 9, 1332 for G2D, 32974 for G3D, and 20203 for GPU compute. The average benchmark score of 49957 places it in the 86th percentile of all GPUs.

The nearest rivals for the RTX 5070 Ti, based on average score, are all within a narrow band. The AMD Radeon RX Vega 64 scores 50001, which is 0.1% higher than the RTX 5070 Ti. The Intel Arc A550M scores 49737, which is 0.4% lower. The AMD Radeon RX 6900 XT scores 50951, which is 2% higher. The AMD Radeon RX 6800 XT scores 48477, which is 3.1% lower. These deltas show the RTX 5070 Ti sits in a competitive cluster where the top rival is only 2% ahead and the closest rival is nearly tied.

The MI455X cannot be benchmarked in the same framework because it has no graphics API support and no display outputs. Its FP32 throughput of 157.3 TFLOPS versus 43.94 TFLOPS for the RTX 5070 Ti gives it a 3.58 times compute advantage, but this is a raw specification comparison rather than a measured benchmark result. The memory bandwidth difference is even more pronounced: 23.3 TB/s versus 896.0 GB/s, a 26 times advantage for the MI455X.

The texture rate comparison also favors the MI455X: 2,457.6 GTexel/s versus 686.6 GTexel/s for the RTX 5070 Ti, a 3.58 times difference that mirrors the FP32 ratio. However, the RTX 5070 Ti has a pixel rate of 235.4 GPixel/s while the MI455X has 0 MPixel/s, meaning the MI455X cannot produce rasterized frames at all. The RTX 5070 Ti's 70 RT cores and 280 tensor cores provide dedicated hardware for ray tracing and AI workloads, which the MI455X lacks entirely.

In the absence of direct head-to-head measurements, the database shows two products with different performance dimensions. The MI455X dominates in raw compute and memory capacity, while the RTX 5070 Ti dominates in graphics-specific features and has a substantial body of benchmark evidence placing it in the upper tier of GPUs. The percentile rankings confirm this split: the RTX 5070 Ti at the 86th percentile has a proven track record, while the MI455X at the 50th percentile has no measured performance data to establish its position.