AMD Radeon Instinct MI300X vs NVIDIA N1X 48SM Comparison

Where Each One Wins

The AMD Radeon Instinct MI300X and NVIDIA N1X 48SM occupy entirely different segments of the accelerator market, and the recorded data confirms a clean split rather than a competitive overlap. The MI300X is a dedicated data center compute module built around a 750 W TDP envelope, an OAM Module slot width, and no display outputs. Its design targets sustained, high-throughput compute workloads where memory capacity and bandwidth dominate. The N1X 48SM, by contrast, is an integrated graphics processor (IGP) on the Blackwell 2.0 architecture, featuring a single HDMI output, a 128 GB memory pool, and an active production status as of its 2026 release date. These are not rivals in the conventional sense; the MI300X wins in raw compute throughput and memory bandwidth, while the N1X 48SM wins in integration, power efficiency characteristics (though its TDP is listed as unknown), and system-level simplicity.

The MI300X claims the decisive wins in every compute-heavy category. Its FP32 throughput of 81.72 TFLOPS dwarfs the N1X 48SM's 28.83 TFLOPS, a factor of roughly 2.8x. The FP16 comparison is even more lopsided: the MI300X delivers 653.7 TFLOPS using an 8:1 ratio, while the N1X 48SM delivers 28.83 TFLOPS at a 1:1 ratio, making the MI300X approximately 22.7x faster in peak FP16 math. The MI300X also leads in texture rate at 2,553.6 GTexel/s versus 900.9 GTexel/s, and in memory bandwidth at 10.3 TB/s versus 273.2 GB/s, a 37.7x advantage. For any workload that saturates memory, the MI300X is the clear choice.

The N1X 48SM counters in the areas that matter for an integrated part. It has a pixel rate of 112.6 GPixel/s, while the MI300X lists 0 MPixel/s, confirming the latter has no rasterization pipeline. The N1X 48SM also carries 48 ray tracing cores and 192 tensor cores, whereas the MI300X lists no RT cores and no tensor cores in the database. The N1X 48SM's 48 ROPs provide actual display output capability, and its 1x HDMI port makes it usable in systems that require a video signal. The MI300X cannot display anything at all.

Architecture Differences

The MI300X uses the Aqua Vanjaram chip on the CDNA 3.0 architecture, manufactured by TSMC on a 5 nm process. The die measures 1017 mm² and contains 153,000 million transistors, yielding a transistor density of 150.4M per mm². The N1X 48SM uses the GB20B chip on the Blackwell 2.0 architecture, also on TSMC's 5 nm process, but with a much smaller die size of 382 mm². Its transistor count is listed as unknown, so a density comparison cannot be made from the recorded data.

Memory architecture separates these two fundamentally. The MI300X pairs a 192 GB HBM3 pool with an 8192 bit bus, producing 10.3 TB/s of bandwidth. The N1X 48SM uses 128 GB of LPDDR5X across a 256 bit bus, yielding 273.2 GB/s. The MI300X memory clock is 2525 MHz with 10.1 Gbps effective data rate; the N1X 48SM memory clock is 1067 MHz with 8.5 Gbps effective. The MI300X's memory subsystem is built for massive parallel access, while the N1X 48SM relies on a unified memory approach typical of integrated processors.

Shader and fixed-function hardware differ sharply. The MI300X has 19,456 shading units, 1,216 TMUs, and zero ROPs. The N1X 48SM has 6,144 shading units, 384 TMUs, and 48 ROPs. The MI300X has no ray tracing cores and no tensor cores recorded; the N1X 48SM has 48 RT cores and 192 tensor cores. Clock behavior also diverges: the MI300X runs at a 1000 MHz base and 2100 MHz boost, while the N1X 48SM runs at a 741 MHz base and a 2346 MHz boost. The N1X 48SM's higher boost clock does not compensate for its smaller shader count, as the FP32 output confirms.

Both parts use a PCIe 5.0 x16 bus interface. The MI300X requires no power connectors, consistent with an OAM module powered through its socket, and lists a suggested PSU of 1150 W. The N1X 48SM is an IGP with no power connectors and no suggested PSU listed. The MI300X has no display outputs; the N1X 48SM has one HDMI output. The MI300X lists no DirectX, OpenGL, or Vulkan support, while the N1X 48SM explicitly lists all three APIs as N/A, indicating it is not a gaming-oriented part despite its display output.

Head-to-Head Benchmarks

The database records no direct head-to-head benchmark results between these two parts, and neither has any individual benchmark scores or nearest rivals listed. The avgBenchmarkScore for both is 0, and both sit at the 50th percentile versus all GPUs. The absence of measured scores means the comparison rests on the specification data in the database.

The single largest gap is FP16 throughput. The MI300X delivers 653.7 TFLOPS using an 8:1 ratio, while the N1X 48SM delivers 28.83 TFLOPS at 1:1. This is a 22.7x difference and reflects the MI300X's purpose-built matrix math acceleration. The N1X 48SM's 1:1 FP16 ratio indicates it does not use specialized reduced-precision paths, meaning its FP16 performance equals its FP32 performance.

FP32 follows a similar pattern. The MI300X produces 81.72 TFLOPS versus the N1X 48SM's 28.83 TFLOPS, a 2.8x advantage. Texture rate shows the MI300X at 2,553.6 GTexel/s versus 900.9 GTexel/s, a 2.8x difference that scales almost exactly with the FP32 ratio, consistent with the shader and TMU counts. Memory bandwidth is the most extreme gap: 10.3 TB/s versus 273.2 GB/s, a 37.7x difference driven by the 8192 bit bus versus the 256 bit bus.

The N1X 48SM wins where the MI300X has no capability. Pixel rate is 112.6 GPixel/s versus 0 MPixel/s. The MI300X has no ROPs, so it cannot rasterize. The N1X 48SM also brings 48 RT cores and 192 tensor cores to the table, features the MI300X does not list. In raw compute terms, however, the MI300X dominates every measured throughput metric.

FAQ

Q: Which part has higher FP32 performance?

A: The AMD Radeon Instinct MI300X delivers 81.72 TFLOPS, which is 2.8x the NVIDIA N1X 48SM's 28.83 TFLOPS.

Q: How do their memory bandwidths compare?

A: The MI300X provides 10.3 TB/s over an 8192 bit HBM3 interface, while the N1X 48SM provides 273.2 GB/s over a 256 bit LPDDR5X interface, a 37.7x difference.

Q: Does the N1X 48SM support ray tracing?

A: Yes, the N1X 48SM includes 48 ray tracing cores and 192 tensor cores. The MI300X lists no RT cores or tensor cores in the database.

Q: Can the MI300X output video?

A: No. The MI300X has no display outputs and a pixel rate of 0 MPixel/s. The N1X 48SM has one HDMI output and a 112.6 GPixel/s pixel rate.

Q: What process nodes do these use?

A: Both are manufactured by TSMC on a 5 nm process. The MI300X die is 1017 mm², while the N1X 48SM die is 382 mm².

Q: What is the FP16 performance of each?

A: The MI300X reaches 653.7 TFLOPS at an 8:1 ratio, while the N1X 48SM reaches 28.83 TFLOPS at a 1:1 ratio, making the MI300X about 22.7x faster.

The Verdict

The data separates these two parts cleanly by intended role. The AMD Radeon Instinct MI300X is a data center compute module for applications that need enormous memory bandwidth, massive FP32 and FP16 throughput, and no display functionality. Its 192 GB HBM3 pool, 10.3 TB/s bandwidth, and 81.72 TFLOPS FP32 make it the appropriate choice for server-side acceleration workloads where the host system provides all I/O and management. The absence of ROPs, display outputs, and graphics APIs confirms it is not a graphics solution.

The NVIDIA N1X 48SM is an integrated processor for systems that need a single chip to handle compute and display output. Its 128 GB LPDDR5X memory, 48 ROPs, 48 RT cores, 192 tensor cores, and one HDMI output allow it to serve as a self-contained graphics and compute solution. Its 28.83 TFLOPS FP32 and FP16 performance is far lower than the MI300X, but its pixel rate of 112.6 GPixel/s and display support make it functional in ways the MI300X cannot match.

Users who require maximum compute density, memory capacity, and bandwidth should select the MI300X. Users who need an integrated part with display output and ray tracing support should select the N1X 48SM. The recorded data shows no overlap in their capabilities, so the choice depends entirely on whether the workload requires rasterization and display or pure throughput.

Specification Differences

| Specification | AMD Radeon Instinct MI300X | NVIDIA N1X 48SM |

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

| Architecture | CDNA 3.0 | Blackwell 2.0 |

| Process Node | 5 nm | 5 nm |

| Die Size | 1017 mm² | 382 mm² |

| Transistors | 153,000 million | unknown |

| Base Clock | 1000 MHz | 741 MHz |

| Boost Clock | 2100 MHz | 2346 MHz |

| Memory Size | 192 GB HBM3 | 128 GB LPDDR5X |

| Memory Bus | 8192 bit | 256 bit |

| Memory Bandwidth | 10.3 TB/s | 273.2 GB/s |

| Shading Units | 19,456 | 6,144 |

| TMUs | 1,216 | 384 |

| ROPs | 0 | 48 |

| RT Cores | null | 48 |

| Tensor Cores | null | 192 |

| FP32 | 81.72 TFLOPS | 28.83 TFLOPS |

| FP16 | 653.7 TFLOPS (8:1) | 28.83 TFLOPS (1:1) |

| Pixel Rate | 0 MPixel/s | 112.6 GPixel/s |

| Texture Rate | 2,553.6 GTexel/s | 900.9 GTexel/s |

| TDP | 750 W | unknown |

| Slot Width | OAM Module | IGP |

| Power Connectors | None | None |

| Suggested PSU | 1150 W | null |

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

| Display Outputs | No outputs | 1x HDMI |

| DirectX | null | N/A |

| OpenGL | null | N/A |

| Vulkan | null | N/A |

| Release Date | 2023-12-05 | 2026-05-31 |

| Production Status | null | Active |