NVIDIA B300 SXM6 AC vs NVIDIA N1X 40SM Comparison

FAQ

Q: What is the performance difference between the NVIDIA B300 SXM6 AC and the NVIDIA N1X 40SM?

A: The B300 SXM6 AC records a Geekbench OpenCL score of 369,831, while the N1X 40SM has no recorded benchmark scores. The B300 sits at the 100th percentile among all GPUs in the database, whereas the N1X 40SM sits at the 50th percentile with an average benchmark score of zero.

Q: How does the B300 SXM6 AC compare to its nearest rivals?

A: The database shows the B300 SXM6 AC is 7% ahead of the NVIDIA B200, 10.4% ahead of the NVIDIA H200 NVL, 16.3% ahead of the AMD Instinct MI300X, and 25% ahead of the NVIDIA L40S in average benchmark scores.

Q: What memory configurations do these two GPUs use?

A: The B300 SXM6 AC uses 288 GB of HBM3e memory on an 8192-bit bus with 8.19 TB/s of bandwidth. The N1X 40SM uses 128 GB of LPDDR5X memory on a 256-bit bus with 273.2 GB/s of bandwidth.

Q: Are these GPUs from the same architecture generation?

A: No. The B300 SXM6 AC uses the GB110 chip with Blackwell Ultra architecture, classified as Server Blackwell (Bxx) generation. The N1X 40SM uses the GB20B chip with Blackwell 2.0 architecture, classified as Blackwell IGP (N1x) generation.

Q: What are the clock speed differences between the two?

A: The B300 SXM6 AC has a base clock of 1665 MHz and a boost clock of 2032 MHz. The N1X 40SM has a base clock of 741 MHz and a boost clock of 2346 MHz, which is 314 MHz higher than the B300's boost.

Q: Which GPU has more shading units?

A: The B300 SXM6 AC has 18,944 shading units, which is 13,824 more than the N1X 40SM's 5,120 shading units. The B300 also has 592 tensor cores versus 160 on the N1X.

Architecture Differences

The two GPUs belong to different Blackwell branches despite sharing the same 5 nm TSMC process node. The B300 SXM6 AC uses the GB110 chip under the Blackwell Ultra architecture, part of the Server Blackwell (Bxx) generation, and it follows the Server Hopper product line with Server Rubin as its successor. The N1X 40SM uses the GB20B chip under Blackwell 2.0 architecture, part of the Blackwell IGP (N1x) generation, and it has no predecessor or successor recorded in the database.

Transistor counts diverge sharply. The B300 packs 208,000 million transistors on a 1628 mm² die, producing a transistor density of 127.8M per mm². The N1X 40SM lists its transistor count as unknown on a 382 mm² die, which is 76.5% smaller. This die size difference reflects the B300's role as a large server accelerator module versus the N1X's integrated GPU package.

The physical formats differ completely. The B300 ships as an SXM Module with a suggested PSU of 1500 W and a TDP of 1100 W. The N1X 40SM is an IGP with no power connectors, no TDP listed, and no suggested PSU. The B300 uses PCIe 6.0 x16 for its bus interface, while the N1X uses PCIe 5.0 x16. Display outputs also separate them: the B300 has no outputs, while the N1X includes one HDMI port.

Memory architecture follows the same split. The B300 uses HBM3e with 288 GB capacity, an 8192-bit bus, and 8.19 TB/s bandwidth. The N1X uses LPDDR5X with 128 GB capacity, a 256-bit bus, and 273.2 GB/s bandwidth. The B300's memory bandwidth is 30 times higher, a gap that reflects the server versus integrated positioning.

Compute resources show proportional differences. The B300 has 18,944 shading units, 592 TMUs, and 24 ROPs. The N1X has 5,120 shading units, 320 TMUs, and 40 ROPs. The N1X includes 40 ray tracing cores, while the B300 lists no ray tracing core count. Tensor core counts are 592 on the B300 versus 160 on the N1X. Both GPUs list no DirectX, OpenGL, or Vulkan API support.

Where Each One Wins

The B300 SXM6 AC wins decisively in raw compute throughput. Its FP32 performance of 76.99 TFLOPS is 3.2 times higher than the N1X 40SM's 24.02 TFLOPS, and FP16 performance follows the same 1:1 ratio on both parts. Texture rate also favors the B300 at 1,202.9 GTexel/s versus 750.7 GTexel/s on the N1X. The B300's 288 GB memory capacity and 8.19 TB/s bandwidth make it suitable for large model training and inference workloads where memory footprint and data movement dominate.

The N1X 40SM wins in specific efficiency-oriented metrics. Its pixel rate of 93.84 GPixel/s exceeds the B300's 48.77 GPixel/s by 92.4%, despite having fewer shading units. The N1X also has a higher boost clock at 2346 MHz versus 2032 MHz on the B300. The N1X includes ray tracing cores, which the B300 does not list, and it provides a display output through HDMI. The N1X's IGP form factor with no power connectors suits integrated deployments where the B300's SXM module with 1100 W TDP cannot fit.

The N1X's 40 ROPs also outnumber the B300's 24 ROPs, contributing to its higher pixel throughput. The B300 compensates with a much larger texture pipeline, using 592 TMUs versus 320 on the N1X. The B300's 208,000 million transistors against the N1X's unknown count, combined with the 1628 mm² die versus 382 mm², positions the B300 for maximum compute density while the N1X targets compact integration.

Release timing differs, with the B300 dated 2025-09-10 and the N1X dated 2026-05-31, placing the N1X later in the product timeline. The B300's production status is Active, and the N1X's production status is also Active.

Specification Differences

| Specification | NVIDIA B300 SXM6 AC | NVIDIA N1X 40SM |

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

| Chip | GB110 | GB20B |

| Architecture | Blackwell Ultra | Blackwell 2.0 |

| Generation | Server Blackwell (Bxx) | Blackwell IGP (N1x) |

| Process Node | 5 nm | 5 nm |

| Die Size | 1628 mm² | 382 mm² |

| Transistors | 208,000 million | unknown |

| Base Clock | 1665 MHz | 741 MHz |

| Boost Clock | 2032 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 | 18944 | 5120 |

| TMUs | 592 | 320 |

| ROPs | 24 | 40 |

| RT Cores | null | 40 |

| Tensor Cores | 592 | 160 |

| Pixel Rate | 48.77 GPixel/s | 93.84 GPixel/s |

| Texture Rate | 1,202.9 GTexel/s | 750.7 GTexel/s |

| FP32 | 76.99 TFLOPS | 24.02 TFLOPS |

| FP16 | 76.99 TFLOPS (1:1) | 24.02 TFLOPS (1:1) |

| TDP | 1100 W | unknown |

| Slot Width | SXM Module | IGP |

| Power Connectors | null | None |

| Suggested PSU | 1500 W | null |

| Bus Interface | PCIe 6.0 x16 | PCIe 5.0 x16 |

| Display Outputs | No outputs | 1x HDMI |

| Release Date | 2025-09-10 | 2026-05-31 |

| Predecessor | Server Hopper | null |

| Successor | Server Rubin | null |

Head-to-Head Benchmarks

The database contains no head-to-head benchmark entries between these two GPUs, and the wins counters show zero for both sides. However, the B300 SXM6 AC has a recorded Geekbench OpenCL score of 369,831, while the N1X 40SM has no recorded benchmark scores at all.

The B300's 369,831 OpenCL score places it at the 100th percentile among all GPUs in the database. Its nearest rivals trail by significant margins: the NVIDIA B200 scores 345,482 (7% behind), the NVIDIA H200 NVL scores 334,891 (10.4% behind), the AMD Instinct MI300X scores 317,994 (16.3% behind), and the NVIDIA L40S scores 295,763 (25% behind). These deltas show the B300 leading its closest competitor by a modest margin and extending the gap to a quarter over the L40S.

The N1X 40SM's 50th percentile placement with an average benchmark score of zero reflects the absence of recorded data. Its nearest rival list is empty, so no comparative performance statements can be made from the database. The FP32 figures provide the only direct compute comparison: the B300 delivers 76.99 TFLOPS, and the N1X delivers 24.02 TFLOPS, making the B300 3.2 times faster in single-precision throughput.

Memory bandwidth separates the two more than any other single metric. The B300's 8.19 TB/s versus the N1X's 273.2 GB/s represents a 30-fold advantage, which directly impacts any workload that streams large datasets through the memory subsystem. The B300's 8192-bit bus width against the N1X's 256-bit bus explains most of this gap.

The N1X's wins come in pixel rate, where 93.84 GPixel/s beats 48.77 GPixel/s, and in boost clock, where 2346 MHz exceeds 2032 MHz. The N1X also carries 40 ray tracing cores and a display output, features absent from the B300's specification list. These advantages point to different workload profiles rather than overall performance superiority.

The Verdict

The data directs different buyers to different products. The B300 SXM6 AC serves compute-heavy server workloads that demand maximum FP32 throughput, massive memory capacity, and extreme bandwidth. Its 76.99 TFLOPS FP32 performance, 288 GB HBM3e memory, and 8.19 TB/s bandwidth place it at the top of the database's percentile rankings with a 369,831 OpenCL score. Its 100th percentile standing and 7% lead over the B200 confirm its position as the highest-performing GPU in the recorded measurements. The 1100 W TDP and 1500 W suggested PSU indicate the power infrastructure required to operate it, and the SXM Module form factor targets rack-mounted server deployments.

The N1X 40SM serves a different purpose. Its IGP form factor, no power connectors, and single HDMI output suit integrated systems where the B300 cannot operate. The higher pixel rate of 93.84 GPixel/s, the ray tracing cores, and the higher boost clock of 2346 MHz indicate a design oriented toward graphics output and rendering tasks rather than massive compute throughput. Its 128 GB LPDDR5X memory and 273.2 GB/s bandwidth are modest by comparison but appropriate for its integrated positioning. The lack of recorded benchmark scores means the database cannot confirm its performance level, though its 50th percentile placement suggests mid-pack standing among all GPUs.

The architecture split reinforces the verdict. The B300 belongs to the Server Blackwell generation with a 1628 mm² die and 208,000 million transistors, while the N1X belongs to the Blackwell IGP generation with a 382 mm² die. The B300's predecessor and successor are recorded as Server Hopper and Server Rubin, confirming its place in a server product line. The N1X has no lineage recorded, consistent with a standalone integrated part. The release dates, with the B300 on 2025-09-10 and the N1X on 2026-05-31, show the N1X arriving later but not displacing the B300's role.

For organizations selecting a server accelerator for large-scale compute, the B300 SXM6 AC is the only choice with recorded performance data. For systems requiring an integrated GPU with display output and ray tracing, the N1X 40SM is the available option. The two do not compete in the same segment, and the database's structure reflects that separation through the B300's full benchmark and rival records against the N1X's empty ones.