NVIDIA B300 vs NVIDIA N1X 40SM Comparison

The Verdict

The data shows two fundamentally different NVIDIA parts. The B300 is a dedicated server accelerator built for maximum compute throughput, while the N1X 40SM is an integrated graphics processor (IGP) designed for a different role entirely. The B300 delivers 76.99 TFLOPS of FP32 performance versus 24.02 TFLOPS for the N1X 40SM, a 3.2x advantage in raw shader throughput. The B300 also carries 144 GB of HBM3e memory with 4.10 TB/s of bandwidth, dwarfing the N1X 40SM's 128 GB of LPDDR5X at 273.2 GB/s. For anyone running server-class AI training, scientific simulation, or large-scale data center workloads, the B300 is the only choice based on these specifications.

The N1X 40SM counters with a higher boost clock of 2346 MHz versus 2032 MHz, a much smaller 382 mm² die, and a pixel rate of 93.84 GPixel/s that exceeds the B300's 48.77 GPixel/s. It also includes 40 ray tracing cores, which the B300 does not list. The N1X 40SM is an IGP with a single HDMI output and no power connectors, indicating a low-power integrated solution. The B300 uses an SXM module slot with a 1400 W TDP and requires an 1800 W suggested PSU. The data clearly separates these products: the B300 is for compute density, the N1X 40SM is for embedded or edge scenarios where integration and display output matter more than raw FP32 throughput.

Architecture Differences

The B300 uses the GB110 chip built on the Blackwell Ultra architecture, while the N1X 40SM uses the GB20B chip on the Blackwell 2.0 architecture. Both are fabricated on a 5 nm process at TSMC, but the transistor counts diverge sharply. The B300 integrates 104,000 million transistors, while the N1X 40SM's transistor count is listed as unknown. The B300's die size is not recorded, but the N1X 40SM has a 382 mm² die. The B300 belongs to the Server Blackwell (Bxx) generation, whereas the N1X 40SM is part of the Blackwell IGP (N1x) generation.

The B300 packs 18,944 shading units, 592 TMUs, and 24 ROPs, alongside 592 tensor cores. The N1X 40SM has 5,120 shading units, 320 TMUs, and 40 ROPs, with 160 tensor cores and 40 ray tracing cores. The B300 does not list ray tracing cores, a notable absence for a server part. The memory subsystems are entirely different: the B300 uses 144 GB of HBM3e with a 4096-bit bus, while the N1X 40SM uses 128 GB of LPDDR5X on a 256-bit bus. The memory clock for the B300 is 2000 MHz with 8 Gbps effective transfer, while the N1X 40SM runs at 1067 MHz with 8.5 Gbps effective.

The N1X 40SM has no DirectX, OpenGL, or Vulkan API support listed, all marked as N/A. It does have a single HDMI display output. The B300 has no display outputs at all. The B300 uses PCIe 5.0 x16, and the N1X 40SM also uses PCIe 5.0 x16, but the N1X 40SM is an IGP with no power connectors and an unknown TDP. The B300 has a 1400 W TDP and uses an SXM module slot. The B300's release date is 2025-09-10, while the N1X 40SM arrived later on 2026-05-31.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The B300 delivers 76.99 TFLOPS in FP32, which is 3.2 times the 24.02 TFLOPS of the N1X 40SM.

Q: What are the memory capacities and types?

A: The B300 has 144 GB of HBM3e with a 4096-bit bus and 4.10 TB/s bandwidth. The N1X 40SM has 128 GB of LPDDR5X with a 256-bit bus and 273.2 GB/s bandwidth.

Q: Does either GPU include ray tracing cores?

A: The N1X 40SM includes 40 ray tracing cores, while the B300 does not list any ray tracing cores in the recorded data.

Q: What is the clock speed difference?

A: The B300 has a base clock of 1665 MHz and a boost of 2032 MHz. The N1X 40SM has a base of 741 MHz and a boost of 2346 MHz, giving it a higher boost clock.

Q: Which GPU has a higher pixel fill rate?

A: The N1X 40SM achieves 93.84 GPixel/s, nearly double the B300's 48.77 GPixel/s.

Q: How do the power requirements compare?

A: The B300 has a 1400 W TDP and a suggested PSU of 1800 W, while the N1X 40SM has an unknown TDP and no power connectors, indicating a much lower power draw.

Specification Differences

| Specification | NVIDIA B300 | 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 |

| Transistors | 104,000 million | unknown |

| Die Size | null | 382 mm² |

| 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 | 144 GB | 128 GB |

| Memory Type | HBM3e | LPDDR5X |

| Memory Bus Width | 4096 bit | 256 bit |

| Memory Bandwidth | 4.10 TB/s | 273.2 GB/s |

| Shading Units | 18944 | 5120 |

| TMUs | 592 | 320 |

| ROPs | 24 | 40 |

| Ray Tracing 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 Performance | 76.99 TFLOPS | 24.02 TFLOPS |

| FP16 Performance | 1,231.8 TFLOPS (16:1) | 24.02 TFLOPS (1:1) |

| TDP | 1400 W | unknown |

| Slot Width | SXM Module | IGP |

| Power Connectors | null | None |

| Suggested PSU | 1800 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 | 2025-09-10 | 2026-05-31 |

Head-to-Head Benchmarks

The B300 dominates in compute throughput. Its FP32 score of 76.99 TFLOPS is more than triple the N1X 40SM's 24.02 TFLOPS. The gap widens dramatically in FP16: the B300 delivers 1,231.8 TFLOPS using a 16:1 ratio, while the N1X 40SM manages 24.02 TFLOPS at a 1:1 ratio. That represents a 51.3x difference in peak FP16 throughput, underscoring the B300's purpose as a tensor-heavy accelerator. The texture rate also favors the B300 at 1,202.9 GTexel/s versus 750.7 GTexel/s, a 1.6x advantage.

Memory bandwidth is another decisive win for the B300. With 4.10 TB/s from HBM3e across a 4096-bit bus, the B300 moves data at 15 times the rate of the N1X 40SM's 273.2 GB/s from LPDDR5X on a 256-bit bus. The B300's memory capacity of 144 GB also exceeds the N1X 40SM's 128 GB, though the margin there is smaller. The transistor count of 104,000 million for the B300 versus unknown for the N1X 40SM further indicates the scale difference.

The N1X 40SM wins in pixel throughput. Its 93.84 GPixel/s is nearly double the B300's 48.77 GPixel/s, driven by its higher ROP count of 40 versus 24 and a boost clock of 2346 MHz. The N1X 40SM also carries 40 ray tracing cores, a feature entirely absent from the B300's listed specifications. The N1X 40SM's boost clock is 314 MHz higher than the B300's, and its 382 mm² die is physically smaller, suggesting a more integrated, less power-hungry design.

The B300's FP16 performance of 1,231.8 TFLOPS at a 16:1 ratio indicates a heavy bias toward tensor operations, whereas the N1X 40SM's FP16 and FP32 are identical at 24.02 TFLOPS, reflecting a balanced 1:1 architecture. The B300's shading unit count of 18,944 is 3.7 times the N1X 40SM's 5,120, and its tensor core count of 592 is 3.7 times the N1X 40SM's 160. The B300's TDP of 1400 W and suggested PSU of 1800 W stand in contrast to the N1X 40SM's unknown TDP and lack of power connectors, reinforcing that the B300 is a high-power server module while the N1X 40SM is an integrated solution. The B300 was released on 2025-09-10, and the N1X 40SM followed on 2026-05-31, with the B300's predecessor listed as Server Hopper and successor as Server Rubin, while the N1X 40SM has no predecessor or successor recorded.