NVIDIA B300 vs NVIDIA N1X 48SM Comparison

The Verdict

The NVIDIA B300 and NVIDIA N1X 48SM occupy completely different positions in the database, despite sharing the same 5 nm TSMC process node. The B300 is a dedicated server accelerator built around the GB110 chip with Blackwell Ultra architecture, while the N1X 48SM is an integrated graphics processor (IGP) using the GB20B chip with Blackwell 2.0 architecture. The data shows two products with fundamentally different design goals: the B300 prioritizes raw compute density and memory bandwidth for server workloads, whereas the N1X 48SM delivers a compact, power-efficient IGP solution with display output.

Benchmark results indicate that neither product has recorded benchmark scores in the database, and both hold a 50th percentile ranking among all GPUs. The absence of head-to-head benchmark data means the comparison rests entirely on specification differences. For compute-heavy server deployments, the B300 is the clear choice: it delivers 76.99 TFLOPS of FP32 performance versus 28.83 TFLOPS for the N1X 48SM, a 2.67x advantage. The B300 also provides 144 GB of HBM3e memory with 4.10 TB/s bandwidth, compared to the N1X 48SM's 128 GB of LPDDR5X at 273.2 GB/s, a 15x bandwidth gap.

For systems requiring integrated graphics with a display output, the N1X 48SM is the only option, as the B300 has no display outputs. The N1X 48SM also delivers a significantly higher pixel rate at 112.6 GPixel/s versus 48.77 GPixel/s for the B300, and it includes 48 ray tracing cores, which the B300 does not list. The N1X 48SM uses no power connectors and is specified as an IGP, whereas the B300 requires a 1400 W TDP and an 1800 W suggested PSU. The B300 targets the server rack; the N1X 48SM targets the motherboard.

Architecture Differences

The B300 uses the GB110 chip, fabricated by TSMC on a 5 nm process, containing 104,000 million transistors. Its architecture is Blackwell Ultra, belonging to the Server Blackwell (Bxx) generation. The N1X 48SM uses the GB20B chip, also fabricated by TSMC on 5 nm, with a die size of 382 mm². Its architecture is Blackwell 2.0, belonging to the Blackwell IGP (N1x) generation. The transistor count for the GB20B is not recorded in the database.

The B300 packs 18,944 shading units, 592 texture mapping units, and 24 raster output pipelines. It also includes 592 tensor cores. The N1X 48SM contains 6,144 shading units, 384 texture mapping units, and 48 raster output pipelines, plus 48 ray tracing cores and 192 tensor cores. The B300 does not list ray tracing cores in its specifications.

Memory architecture differs substantially. The B300 uses 144 GB of HBM3e with a 4096-bit bus and 4.10 TB/s bandwidth. The N1X 48SM uses 128 GB of LPDDR5X with a 256-bit bus and 273.2 GB/s bandwidth. The B300's memory clock is listed at 2000 MHz with 8 Gbps effective, while the N1X 48SM runs at 1067 MHz with 8.5 Gbps effective.

Clock behavior diverges sharply. The B300 has a base clock of 1665 MHz and a boost clock of 2032 MHz. The N1X 48SM has a much lower base clock of 741 MHz but a higher boost clock of 2346 MHz. This suggests the N1X 48SM relies on aggressive boost behavior, while the B300 maintains a higher sustained baseline.

The B300 is a PCIe 5.0 x16 SXM module with no display outputs. The N1X 48SM is also PCIe 5.0 x16 but is classified as an IGP and includes one HDMI output. The B300's APIs for DirectX, OpenGL, and Vulkan are not listed, while the N1X 48SM explicitly reports N/A for all three.

FAQ

Q: Which GPU has more FP32 compute performance?

A: The B300 delivers 76.99 TFLOPS of FP32 performance, which is 2.67x higher than the N1X 48SM's 28.83 TFLOPS.

Q: Which GPU has faster memory bandwidth?

A: The B300 provides 4.10 TB/s of bandwidth over a 4096-bit HBM3e interface. The N1X 48SM provides 273.2 GB/s over a 256-bit LPDDR5X interface. The B300's bandwidth is approximately 15x higher.

Q: Can either GPU output video to a display?

A: Only the N1X 48SM has a display output, which is a single HDMI port. The B300 has no display outputs at all.

Q: What is the difference in ray tracing capability?

A: The N1X 48SM includes 48 ray tracing cores. The B300 does not list any ray tracing cores in its specifications.

Q: How do the boost clocks compare?

A: The N1X 48SM boosts to 2346 MHz, which is higher than the B300's 2032 MHz boost clock. However, the N1X 48SM has a lower base clock at 741 MHz versus 1665 MHz for the B300.

Q: Which GPU has a larger die area?

A: The N1X 48SM has a recorded die size of 382 mm². The B300's die size is not listed in the database.

Specification Differences

The two GPUs differ across nearly every recorded specification field.

| Specification | NVIDIA B300 | NVIDIA N1X 48SM |

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

| Chip | GB110 | GB20B |

| Architecture | Blackwell Ultra | Blackwell 2.0 |

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

| Process Node | 5 nm | 5 nm |

| Foundry | TSMC | TSMC |

| Transistors | 104,000 million | unknown |

| Die Size | not listed | 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 | 18,944 | 6,144 |

| TMUs | 592 | 384 |

| ROPs | 24 | 48 |

| Ray Tracing Cores | not listed | 48 |

| Tensor Cores | 592 | 192 |

| Pixel Rate | 48.77 GPixel/s | 112.6 GPixel/s |

| Texture Rate | 1,202.9 GTexel/s | 900.9 GTexel/s |

| FP32 Performance | 76.99 TFLOPS | 28.83 TFLOPS |

| FP16 Performance | 1,231.8 TFLOPS (16:1) | 28.83 TFLOPS (1:1) |

| TDP | 1400 W | unknown |

| Slot Width | SXM Module | IGP |

| Power Connectors | not listed | None |

| Suggested PSU | 1800 W | not listed |

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

| Display Outputs | No outputs | 1x HDMI |

| DirectX | not listed | N/A |

| OpenGL | not listed | N/A |

| Vulkan | not listed | N/A |

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

| Predecessor | Server Hopper | not listed |

| Successor | Server Rubin | not listed |

Head-to-Head Benchmarks

The database contains no recorded head-to-head benchmark results between the B300 and N1X 48SM, nor any individual benchmark scores for either product. The comparison below relies on the recorded specification data and the computed rates derived from those specifications.

The B300 dominates in raw compute throughput. Its FP32 output of 76.99 TFLOPS is 2.67x the N1X 48SM's 28.83 TFLOPS. In FP16 workloads, the gap widens dramatically: the B300 delivers 1,231.8 TFLOPS using a 16:1 ratio, while the N1X 48SM delivers 28.83 TFLOPS at a 1:1 ratio. This makes the B300 approximately 42.7x faster in FP16 operations, reflecting its tensor core design optimized for AI training and inference workloads.

Texture processing also favors the B300. The B300 achieves a texture rate of 1,202.9 GTexel/s, which is 1.34x the N1X 48SM's 900.9 GTexel/s. This advantage stems from the B300's 592 TMUs versus 384 TMUs, combined with its higher boost clock of 2032 MHz. The N1X 48SM's 2346 MHz boost clock partially compensates for its lower TMU count, but not enough to close the gap.

Memory bandwidth represents the largest single-point advantage for the B300. With 4.10 TB/s across a 4096-bit HBM3e interface, the B300 offers roughly 15x the bandwidth of the N1X 48SM's 273.2 GB/s across a 256-bit LPDDR5X interface. This bandwidth differential is critical for large model parameter access and high-throughput data movement in server environments.

The N1X 48SM wins in pixel processing. Its pixel rate of 112.6 GPixel/s is 2.31x the B300's 48.77 GPixel/s, driven by 48 ROPs versus 24 ROPs. This suggests the N1X 48SM is better suited for display-centric workloads despite its lower overall compute capacity. The N1X 48SM also includes 48 ray tracing cores, a feature absent from the B300's recorded specifications.

Power requirements reflect the design divergence. The B300 carries a 1400 W TDP with an 1800 W suggested PSU, while the N1X 48SM has no recorded TDP, uses no power connectors, and is classified as an IGP. The B300's release date of 2025-09-10 precedes the N1X 48SM's 2026-05-31, and the B300 has recorded predecessor (Server Hopper) and successor (Server Rubin) generations, while the N1X 48SM lists neither.

The release timeline and product positioning indicate the B300 anchors the high end of NVIDIA's server lineup, while the N1X 48SM serves as an integrated solution with modest compute but integrated display capability. The data confirms that these products do not compete in the same segment; they address different system integration points within the same architectural family.