AMD Instinct MI355X vs NVIDIA GeForce RTX 4070 Mobile Comparison

Head-to-Head Benchmarks

The benchmark database contains no direct head-to-head measurements for the AMD Instinct MI355X and NVIDIA GeForce RTX 4070 Mobile, and the Instinct MI355X has no recorded average benchmark score. Its percentile rank against all GPUs sits at 50, with an average benchmark score of 0, indicating that no standardized workload results have been logged for this accelerator. The RTX 4070 Mobile, by contrast, has a substantial set of recorded results: its average benchmark score is 27,435, placing it in the 73rd percentile of all GPUs in the database.

Looking at the RTX 4070 Mobile's individual results, the data shows strong compute performance in certain APIs. Its Geekbench OpenCL score is 109,197, and its Geekbench Vulkan score is 108,367, both indicating robust general-purpose compute capability. In Passmark testing, the GPU delivers a G3D score of 19,587, a GPU Compute score of 8,399, and a G2D score of 763. The DirectX results are more modest: Passmark DirectX 11 scores 179, DirectX 9 scores 223, DirectX 12 scores 85, and DirectX 10 scores 116.

The nearest rivals for the RTX 4070 Mobile provide context for these numbers. The AMD Radeon RX 6700 XT records an average score of 27,425, essentially identical with a delta of 0%. The NVIDIA GeForce RTX 3090 scores 27,565, which is 0.5% higher than the RTX 4070 Mobile. The NVIDIA RTX PRO 4000 Blackwell scores 27,135, which is 1.1% lower. The AMD Radeon Pro Vega 20 scores 27,839, which is 1.5% higher. These deltas indicate that the RTX 4070 Mobile sits in a tight performance cluster, with all four comparable GPUs within roughly 1.5% of its average score.

Because the MI355X has no benchmark entries, the database cannot produce a win count for either product in a head-to-head comparison. The winsA and winsB fields both read 0, confirming that no comparative workload data exists. This absence of data is itself significant: the MI355X is a data-center accelerator with no display outputs, no recorded gaming or compute benchmarks, and no nearest rivals listed, while the RTX 4070 Mobile is a mobile consumer GPU with a full suite of benchmark results.

Architecture Differences

The two processors target fundamentally different market segments, and the architecture data reflects that divergence. The AMD Instinct MI355X uses the CDNA 4.0 architecture on a 3 nm process from TSMC, with a chip designated as MI350 256CU. It integrates 185,000 million transistors on a die size of 2,380 mm², yielding a transistor density of 77.7 million per mm². The NVIDIA GeForce RTX 4070 Mobile uses Ada Lovelace on a 5 nm process, also from TSMC, with the AD106 chip. It contains 22,900 million transistors on a die size of 188 mm², for a density of 121.8 million per mm².

The transistor density figures are instructive: the RTX 4070 Mobile packs more transistors per square millimeter (121.8M / mm² versus 77.7M / mm²), a consequence of the smaller process node difference being partially offset by the MI355X's massive die. The MI355X's die area is over 12 times larger than the RTX 4070 Mobile's, which explains its much higher absolute transistor count.

Memory architecture differs completely. The MI355X uses 288 GB of HBM3e across an 8192-bit bus, delivering 8.19 TB/s of bandwidth. The RTX 4070 Mobile uses 8 GB of GDDR6 across a 128-bit bus, delivering 256.0 GB/s. The bandwidth gap is enormous: the MI355X provides approximately 32 times more memory bandwidth, and its memory capacity is 36 times larger. Clock speeds also differ: the MI355X runs at a base of 1000 MHz and a boost of 2400 MHz, while the RTX 4070 Mobile runs at 1395 MHz base and 1695 MHz boost. The mobile GPU has a higher base clock, but the MI355X has a significantly higher boost clock.

Compute resources show a similar scale disparity. The MI355X has 16,384 shading units and 1,024 texture mapping units, while the RTX 4070 Mobile has 4,608 shading units and 144 TMUs. The MI355X has zero ROPs (a data-center design choice), while the RTX 4070 Mobile has 48 ROPs. The RTX 4070 Mobile includes 36 ray tracing cores and 144 tensor cores; the MI355X lists null values for both, indicating these are not applicable to its CDNA architecture. The MI355X's texture rate is 2,457.6 GTexel/s versus the RTX 4070 Mobile's 244.1 GTexel/s, a 10x difference. Pixel rate is 0 MPixel/s for the MI355X, while the RTX 4070 Mobile achieves 81.36 GPixel/s.

FP32 compute follows the same pattern: the MI355X delivers 78.64 TFLOPS, while the RTX 4070 Mobile delivers 15.62 TFLOPS, a ratio of approximately 5 to 1. Both list FP16 at 1:1 with FP32, meaning the MI355X hits 78.64 TFLOPS FP16 and the RTX 4070 Mobile hits 15.62 TFLOPS FP16.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI355X delivers 78.64 TFLOPS, which is approximately 5 times the 15.62 TFLOPS of the NVIDIA GeForce RTX 4070 Mobile.

Q: How do the memory bandwidth figures compare?

A: The MI355X provides 8.19 TB/s across an 8192-bit HBM3e bus, while the RTX 4070 Mobile provides 256.0 GB/s across a 128-bit GDDR6 bus. The MI355X's bandwidth is approximately 32 times higher.

Q: What is the transistor count and die size for each chip?

A: The MI355X contains 185,000 million transistors on a 2,380 mm² die. The RTX 4070 Mobile contains 22,900 million transistors on an 188 mm² die. The MI355X has a lower transistor density (77.7M / mm² versus 121.8M / mm²).

Q: Does the RTX 4070 Mobile support ray tracing and tensor cores?

A: Yes, the RTX 4070 Mobile includes 36 ray tracing cores and 144 tensor cores. The MI355X lists no values for these features, consistent with its CDNA 4.0 compute-focused architecture.

Q: What benchmark data exists for the MI355X?

A: The database contains no benchmark scores for the MI355X. Its average benchmark score is 0, its percentile rank is 50, and it has no nearest rivals listed.

Q: How does the RTX 4070 Mobile compare to its nearest rivals?

A: The RTX 4070 Mobile's average score of 27,435 is within 1.5% of all four nearest rivals: the Radeon RX 6700 XT (27,425, 0% delta), RTX 3090 (27,565, -0.5%), RTX PRO 4000 Blackwell (27,135, 1.1%), and Radeon Pro Vega 20 (27,839, -1.5%).

Specification Differences

| Specification | AMD Instinct MI355X | NVIDIA GeForce RTX 4070 Mobile |

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

| Architecture | CDNA 4.0 | Ada Lovelace |

| Process Node | 3 nm | 5 nm |

| Transistors | 185,000 million | 22,900 million |

| Die Size | 2380 mm² | 188 mm² |

| Transistor Density | 77.7M / mm² | 121.8M / mm² |

| Base Clock | 1000 MHz | 1395 MHz |

| Boost Clock | 2400 MHz | 1695 MHz |

| Memory Size | 288 GB | 8 GB |

| Memory Type | HBM3e | GDDR6 |

| Memory Bus Width | 8192 bit | 128 bit |

| Memory Bandwidth | 8.19 TB/s | 256.0 GB/s |

| Shading Units | 16384 | 4608 |

| TMUs | 1024 | 144 |

| ROPs | 0 | 48 |

| RT Cores | N/A | 36 |

| Tensor Cores | N/A | 144 |

| Pixel Rate | 0 MPixel/s | 81.36 GPixel/s |

| Texture Rate | 2,457.6 GTexel/s | 244.1 GTexel/s |

| FP32 | 78.64 TFLOPS | 15.62 TFLOPS |

| FP16 | 78.64 TFLOPS (1:1) | 15.62 TFLOPS (1:1) |

| TDP | 1400 W | 115 W |

| Slot Width | OAM Module | IGP |

| Bus Interface | PCIe 5.0 x16 | PCIe 4.0 x8 |

| Display Outputs | No outputs | Portable Device Dependent |

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

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.4 |

| Release Date | 2025-06-11 | 2023-01-02 |

| Production Status | Not specified | Active |

Additional differences: the MI355X has no power connectors (using external power delivery for an OAM module) and a suggested PSU of 1800 W, while the RTX 4070 Mobile has no suggested PSU and no power connectors. The MI355X measures 102 mm in length and 165 mm in width; the RTX 4070 Mobile has no recorded dimensions. The MI355X lists no API support for DirectX, OpenGL, or Vulkan, while the RTX 4070 Mobile supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The MI355X's predecessor is Radeon Instinct, while the RTX 4070 Mobile's predecessor is GeForce 30 Mobile and its successor is GeForce 50 Mobile.

The Verdict

The data describes two products with almost no overlap in purpose. The AMD Instinct MI355X is a data-center accelerator designed for massive parallel compute workloads. Its 78.64 TFLOPS FP32, 8.19 TB/s memory bandwidth, and 288 GB of HBM3e place it in a category where consumer gaming and workstation metrics do not apply. Its lack of display outputs, null API support, and 1400 W TDP confirm that it is not intended for interactive graphics. The absence of benchmark scores in the database means that its real-world performance cannot be quantified relative to other GPUs, but its architectural specifications indicate a device built for scale-out compute environments.

The NVIDIA GeForce RTX 4070 Mobile is a mobile consumer GPU with a complete feature set: 36 ray tracing cores, 144 tensor cores, DirectX 12 Ultimate support, OpenGL 4.6, and Vulkan 1.4. Its benchmark results place it in the 73rd percentile of all GPUs, with an average score of 27,435. The nearest rival data shows that it performs essentially on par with desktop GPUs like the RTX 3090 (within 0.5%) and the RX 6700 XT (within 0%), which is notable for a mobile part with a 115 W TDP.

For a user choosing between these two, the decision hinges entirely on workload. The MI355X offers raw compute density, enormous memory capacity, and bandwidth that the RTX 4070 Mobile cannot approach: 5 times the FP32 throughput, 32 times the memory bandwidth, and 36 times the memory capacity. The RTX 4070 Mobile offers ray tracing, tensor cores, a full graphics API stack, and portability, with a TDP that is roughly 12 times lower (115 W versus 1400 W). The MI355X also requires a PCIe 5.0 x16 connection and an OAM module slot, while the RTX 4070 Mobile uses PCIe 4.0 x8 and integrates into laptops as an IGP.

The database's percentile data only applies to the RTX 4070 Mobile, which sits at the 73rd percentile. The MI355X's 50th percentile rank with zero benchmark scores does not reflect performance; it reflects a lack of recorded data. Users seeking a validated, benchmarked mobile GPU should look at the RTX 4070 Mobile. Users deploying a data-center accelerator for compute-heavy tasks should evaluate the MI355X based on its architectural specifications, as no standardized benchmarks are available to confirm its standing among other accelerators. The two products serve distinct ecosystems, and the recorded data supports that division clearly.