AMD Instinct MI355X vs NVIDIA N1 16SM Comparison

The Verdict

The recorded data presents two radically different compute products that share almost nothing beyond a PCIe 5.0 x16 interface and a TSMC foundry. The AMD Instinct MI355X is a 1400 W OAM module built for massive parallel throughput, while the NVIDIA N1 16SM is a 5 nm integrated graphics processor with a single HDMI output and no standalone power connector requirement. The database shows no benchmark scores for either part, and both sit at the 50th percentile versus all GPUs with an average benchmark score of zero. This means the comparison must rest entirely on architectural specifications, memory subsystems, and raw compute ceilings.

The AMD Instinct MI355X targets workloads that demand enormous memory capacity and bandwidth: 288 GB of HBM3e on an 8192-bit bus delivers 8.19 TB/s, which is 30 times the bandwidth of the NVIDIA part. Its FP32 throughput of 78.64 TFLOPS is roughly 8.2 times the N1 16SM's 9.609 TFLOPS. The NVIDIA N1 16SM, conversely, is a Blackwell 2.0 IGP with a 382 mm² die, 16 ray tracing cores, 64 tensor cores, and 24 ROPs, making it suitable for integrated graphics duties where the AMD module has no display outputs at all. The data indicates no overlap in intended use cases. The MI355X is a compute accelerator; the N1 16SM is an integrated processor for systems needing modest graphics and AI acceleration in a compact, low-power footprint.

Architecture Differences

The AMD Instinct MI355X uses the CDNA 4.0 architecture on a 3 nm process with 185,000 million transistors packed into a 2380 mm² die, yielding a transistor density of 77.7 million per square millimeter. The chip is designated MI350 256CU, indicating 256 compute units. The NVIDIA N1 16SM uses Blackwell 2.0 on a 5 nm process with a 382 mm² die and unknown transistor count. The process node difference is significant: 3 nm versus 5 nm, both from TSMC, but the AMD part uses the smaller geometry to integrate over 185 billion transistors.

The MI355X has 16,384 shading units, 1,024 texture mapping units, and zero ROPs. Its pixel rate is recorded as 0 MPixel/s and its texture rate is 2,457.6 GTexel/s. The N1 16SM has 2,048 shading units, 128 TMUs, 24 ROPs, 16 ray tracing cores, and 64 tensor cores. Its pixel rate is 56.30 GPixel/s and texture rate is 300.3 GTexel/s. The presence of ROPs and ray tracing cores on the NVIDIA part confirms its graphics-oriented design, while the AMD part's zero ROPs and zero pixel rate confirm it is not designed for rasterization.

Memory architecture diverges completely. The MI355X uses HBM3e with 288 GB capacity, 8192-bit bus width, and 8.19 TB/s bandwidth, with memory clocked at 2000 MHz (8 Gbps effective). The N1 16SM uses LPDDR5X with 128 GB capacity, 256-bit bus width, and 273.2 GB/s bandwidth, with memory at 1067 MHz (8.5 Gbps effective). The AMD part's bus width is 32 times wider, and its bandwidth advantage is approximately 30-fold. Clock speeds also differ: the MI355X runs at 1000 MHz base and 2400 MHz boost, while the N1 16SM runs at 741 MHz base and 2346 MHz boost. Despite the lower base clock, the NVIDIA part's boost clock is only 54 MHz lower than AMD's.

Power characteristics are starkly different. The MI355X has a TDP of 1400 W and a suggested PSU of 1800 W, using an OAM module slot with no power connectors. The N1 16SM has unknown TDP and no suggested PSU, consistent with an IGP that draws power through the motherboard. The MI355X has no display outputs; the N1 16SM has one HDMI output. Both parts list DirectX, OpenGL, and Vulkan as N/A, indicating neither targets conventional graphics APIs.

FAQ

Q: Which product has higher raw compute throughput?

A: The AMD Instinct MI355X delivers 78.64 TFLOPS FP32 and 78.64 TFLOPS FP16 (1:1), while the NVIDIA N1 16SM delivers 9.609 TFLOPS FP32 and 9.609 TFLOPS FP16 (1:1). The AMD part is approximately 8.2 times faster in both precisions.

Q: How do the memory subsystems compare?

A: The MI355X uses 288 GB of HBM3e on an 8192-bit bus with 8.19 TB/s bandwidth. The N1 16SM uses 128 GB of LPDDR5X on a 256-bit bus with 273.2 GB/s bandwidth. The AMD part has 2.25 times the capacity, 32 times the bus width, and 30 times the bandwidth.

Q: Does either product support display output?

A: The AMD Instinct MI355X has no display outputs. The NVIDIA N1 16SM has a single HDMI output. This indicates the NVIDIA part can drive a display, while the AMD part cannot.

Q: What is the physical form factor of each?

A: The MI355X is an OAM module measuring 102 mm (4 inches) in length and 165 mm (6.5 inches) in width, with no power connectors. The N1 16SM is an IGP with no recorded dimensions and no power connectors.

Q: Which product includes ray tracing and tensor cores?

A: Only the NVIDIA N1 16SM includes these: 16 ray tracing cores and 64 tensor cores. The AMD MI355X lists null values for both RT cores and tensor cores, and its CDNA 4.0 architecture does not expose these as separate units in the data.

Q: What are the production status and release dates?

A: The MI355X has no production status recorded and a release date of 2025-06-11. The N1 16SM is marked as Active with a release date of 2026-05-31. The NVIDIA part is newer and currently in production.

Specification Differences

| Field | AMD Instinct MI355X | NVIDIA N1 16SM |

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

| Architecture | CDNA 4.0 | Blackwell 2.0 |

| Process node | 3 nm | 5 nm |

| Transistors | 185,000 million | unknown |

| Die size | 2380 mm² | 382 mm² |

| Transistor density | 77.7M / mm² | null |

| Base clock | 1000 MHz | 741 MHz |

| Boost clock | 2400 MHz | 2346 MHz |

| Memory clock | 2000 MHz (8 Gbps effective) | 1067 MHz (8.5 Gbps effective) |

| Memory size | 288 GB | 128 GB |

| Memory type | HBM3e | LPDDR5X |

| Memory bus width | 8192 bit | 256 bit |

| Memory bandwidth | 8.19 TB/s | 273.2 GB/s |

| Shading units | 16384 | 2048 |

| TMUs | 1024 | 128 |

| ROPs | 0 | 24 |

| RT cores | null | 16 |

| Tensor cores | null | 64 |

| Pixel rate | 0 MPixel/s | 56.30 GPixel/s |

| Texture rate | 2,457.6 GTexel/s | 300.3 GTexel/s |

| FP32 | 78.64 TFLOPS | 9.609 TFLOPS |

| FP16 | 78.64 TFLOPS (1:1) | 9.609 TFLOPS (1:1) |

| TDP | 1400 W | unknown |

| Slot width | OAM Module | IGP |

| Suggested PSU | 1800 W | null |

| Display outputs | No outputs | 1x HDMI |

| Dimensions | 102 mm x 165 mm | null |

| Release date | 2025-06-11 | 2026-05-31 |

| Production status | null | Active |

Head-to-Head Benchmarks

The database contains no head-to-head benchmark entries, no wins for either product, and no nearest rival data. Both products have an average benchmark score of zero and a percentile rank of 50 against all GPUs. This absence of measured performance means the comparison relies on specification-derived ceilings.

The largest computational advantage belongs to the AMD part in FP32 throughput. At 78.64 TFLOPS versus 9.609 TFLOPS, the MI355X holds an 8.18x lead. In FP16, the same ratio applies since both parts list 1:1 FP16/FP32 performance. Texture rate shows a similar gap: 2,457.6 GTexel/s versus 300.3 GTexel/s, an 8.18x advantage for AMD. Memory bandwidth amplifies the gap further: 8.19 TB/s versus 273.2 GB/s, a 29.98x lead for the AMD module.

The NVIDIA part wins in graphics-oriented specifications. Its pixel rate of 56.30 GPixel/s versus 0 MPixel/s for AMD is an absolute victory, since the MI355X has no ROPs and cannot rasterize. The N1 16SM also has 24 ROPs, 16 RT cores, and 64 tensor cores, all absent from the AMD specification. The NVIDIA part's boost clock of 2346 MHz is close to AMD's 2400 MHz, and its memory clock of 1067 MHz (8.5 Gbps effective) exceeds AMD's 2000 MHz (8 Gbps effective) in effective data rate per pin, though the aggregate bandwidth is far lower due to the 256-bit bus versus 8192-bit bus.

Transistor density favors AMD at 77.7M per mm² versus null for NVIDIA, but the NVIDIA die is far smaller at 382 mm² versus 2380 mm². The AMD part integrates 185,000 million transistors; the NVIDIA count is unknown. Release timing shows NVIDIA's part is newer by roughly a year, with AMD releasing 2025-06-11 and NVIDIA 2026-05-31.

Where Each One Wins

The AMD Instinct MI355X wins decisively in compute density and memory capacity. Its 78.64 TFLOPS FP32 and FP16 performance targets large-scale numerical workloads, and its 288 GB HBM3e pool with 8.19 TB/s bandwidth suits data sets that cannot fit in smaller memories. The 8192-bit bus and 30x bandwidth advantage over the NVIDIA part indicate the MI355X is built for memory-bound compute, not graphics. The 1400 W TDP and 1800 W suggested PSU confirm it is a data center accelerator requiring dedicated power delivery. The OAM slot width and absence of display outputs reinforce that this is a server-side compute module.

The NVIDIA N1 16SM wins in integrated graphics capability and system integration. Its 24 ROPs and 56.30 GPixel/s pixel rate provide actual display output through a single HDMI port, something the AMD part cannot do. The 16 ray tracing cores and 64 tensor cores give it hardware acceleration for graphics and AI inference tasks in a compact IGP form factor. The 128 GB LPDDR5X memory, while far slower than HBM3e, is still substantial for an integrated part and runs at a higher effective data rate per pin (8.5 Gbps versus 8 Gbps). Its unknown TDP and lack of a suggested PSU indicate it draws power from the host system without additional connectors, making it suitable for systems where the 1400 W TDP of the AMD module would be impossible.

The production status also splits the two: NVIDIA's part is Active, while AMD's has no production status recorded. The release dates place NVIDIA's part later, which may indicate a more recent design. The transistor count for NVIDIA is unknown, but its 382 mm² die on 5 nm is dramatically smaller than AMD's 2380 mm² on 3 nm, suggesting the N1 16SM is designed for cost-sensitive, space-constrained integration rather than maximum throughput. The data supports a clear division: the MI355X for compute-heavy, memory-hungry workloads, and the N1 16SM for graphics-capable integrated systems.