NVIDIA B200 SXM6 vs NVIDIA GeForce RTX 4090 Mobile Comparison

FAQ

Q: Which GPU has a larger memory capacity?

A: The NVIDIA B200 SXM6 has 180 GB of HBM3e memory, while the NVIDIA GeForce RTX 4090 Mobile has 16 GB of GDDR6 memory. The B200’s memory capacity is over eleven times larger.

Q: How do the two GPUs compare in raw FP32 compute performance?

A: The B200 SXM6 delivers 69.34 TFLOPS of FP32 compute, which is roughly 2.1 times the 32.98 TFLOPS of the RTX 4090 Mobile. The B200 also matches its FP16 output at 69.34 TFLOPS (1:1), whereas the RTX 4090 Mobile produces 32.98 TFLOPS in FP16.

Q: What are the memory bandwidth figures for each GPU?

A: The B200 SXM6 reaches 8.19 TB/s of memory bandwidth, while the RTX 4090 Mobile delivers 576.0 GB/s. The B200’s bandwidth is approximately 14 times higher.

Q: Which architecture does each GPU use?

A: The B200 SXM6 is based on the Blackwell architecture with the GB100 chip, while the RTX 4090 Mobile uses the Ada Lovelace architecture with the AD103 chip. Both are built on a 5 nm process at TSMC.

Q: What is the thermal design power (TDP) difference?

A: The B200 SXM6 has a TDP of 1000 W with a suggested PSU of 1400 W, while the RTX 4090 Mobile has a TDP of 120 W and no suggested PSU listed. The B200 consumes over eight times the power envelope.

Q: Does the RTX 4090 Mobile support modern graphics APIs?

A: Yes, the RTX 4090 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The B200 SXM6 has no API support listed for DirectX, OpenGL, or Vulkan.

Architecture Differences

The two GPUs represent distinct architectural lineages from NVIDIA. The B200 SXM6 uses the GB100 chip built on the Blackwell architecture, belonging to the Server Blackwell (Bxx) generation. The RTX 4090 Mobile uses the AD103 chip based on Ada Lovelace, part of the GeForce 40 Mobile generation. Both are fabricated on a 5 nm process at TSMC, but the transistor counts differ substantially: the B200 integrates 208,000 million transistors on a 1628 mm² die, while the RTX 4090 Mobile packs 45,900 million transistors on a 379 mm² die. The transistor density is 127.8M per mm² for the B200 versus 121.1M per mm² for the RTX 4090 Mobile.

The memory subsystems are fundamentally different. The B200 uses 180 GB of HBM3e across an 8192-bit bus, yielding 8.19 TB/s of bandwidth. The RTX 4090 Mobile uses 16 GB of GDDR6 across a 256-bit bus, delivering 576.0 GB/s. The B200’s memory clock is listed at 2000 MHz (8 Gbps effective), while the RTX 4090 Mobile runs at 2250 MHz (18 Gbps effective). The B200’s memory bandwidth advantage is over fourteen times the RTX 4090 Mobile’s figure.

Compute resources also diverge sharply. The B200 has 18,944 shading units, 592 TMUs, and 24 ROPs, with 592 tensor cores. The RTX 4090 Mobile has 9,728 shading units, 304 TMUs, and 112 ROPs, with 76 RT cores and 304 tensor cores. The B200’s shading unit count is roughly double the RTX 4090 Mobile’s, but the RTX 4090 Mobile has 112 ROPs versus the B200’s 24, contributing to its higher pixel rate of 189.8 GPixel/s versus 43.92 GPixel/s for the B200. Texture rate is higher on the B200 at 1,083.4 GTexel/s versus 515.3 GTexel/s.

The B200 is a server module with an SXM slot width, PCIe 6.0 x16 interface, and no display outputs. The RTX 4090 Mobile is an integrated GPU (IGP) with a PCIe 4.0 x16 interface and display outputs described as portable device dependent. The B200 has no power connectors listed, while the RTX 4090 Mobile lists none as well. The B200’s production status is active, released on 2024-10-31, with a predecessor of Server Hopper and successor of Server Rubin. The RTX 4090 Mobile is also active, released on 2023-01-02, with a predecessor of GeForce 30 Mobile and successor of GeForce 50 Mobile.

The Verdict

The recorded data shows a clear split in design intent. The B200 SXM6 is a server accelerator with massive memory capacity, extreme bandwidth, and double the FP32 compute of the RTX 4090 Mobile. Its 180 GB HBM3e pool and 8.19 TB/s bandwidth are optimized for large-scale data processing and high-throughput workloads, not for graphics output, as indicated by its lack of display outputs and API support.

The RTX 4090 Mobile is a portable graphics solution with full DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 support. It delivers 189.8 GPixel/s pixel rate, which is over four times the B200’s 43.92 GPixel/s, and its 112 ROPs enable rasterization tasks that the B200 cannot handle. The RTX 4090 Mobile also has a much lower power envelope at 120 W versus the B200’s 1000 W, making it suitable for mobile systems.

Benchmark data exists only for the RTX 4090 Mobile, with an average benchmark score of 43,667 and a percentile of 84 among all GPUs. Its nearest rivals include the NVIDIA Quadro M6000 at 43,301 (0.8% higher), the GeForce RTX 5050 Mobile at 43,268 (0.9% higher), the Quadro M6000 24 GB at 43,262 (0.9% higher), and the RTX A6000 at 44,075 (0.9% lower). No benchmark scores are recorded for the B200, so direct performance comparisons rely on the specification differences above.

The choice between these GPUs depends entirely on workload type. For compute-heavy server tasks requiring massive memory and bandwidth, the B200 is the only option with its HBM3e configuration. For interactive graphics, rendering, or any application needing display output and modern API support, the RTX 4090 Mobile is the functional choice. The B200’s lack of API support and display outputs makes it unsuitable for client-side graphics work.

Specification Differences

| Specification | NVIDIA B200 SXM6 | NVIDIA GeForce RTX 4090 Mobile |

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

| Chip | GB100 | AD103 |

| Architecture | Blackwell | Ada Lovelace |

| Generation | Server Blackwell (Bxx) | GeForce 40 Mobile |

| Transistors | 208,000 million | 45,900 million |

| Die Size | 1628 mm² | 379 mm² |

| Transistor Density | 127.8M / mm² | 121.1M / mm² |

| Base Clock | 120 MHz | 1335 MHz |

| Boost Clock | 1830 MHz | 1695 MHz |

| Memory Clock | 2000 MHz 8 Gbps effective | 2250 MHz 18 Gbps effective |

| Memory Size | 180 GB | 16 GB |

| Memory Type | HBM3e | GDDR6 |

| Memory Bus Width | 8192 bit | 256 bit |

| Memory Bandwidth | 8.19 TB/s | 576.0 GB/s |

| Shading Units | 18,944 | 9,728 |

| TMUs | 592 | 304 |

| ROPs | 24 | 112 |

| RT Cores | null | 76 |

| Tensor Cores | 592 | 304 |

| Pixel Rate | 43.92 GPixel/s | 189.8 GPixel/s |

| Texture Rate | 1,083.4 GTexel/s | 515.3 GTexel/s |

| FP32 | 69.34 TFLOPS | 32.98 TFLOPS |

| FP16 | 69.34 TFLOPS (1:1) | 32.98 TFLOPS (1:1) |

| TDP | 1000 W | 120 W |

| Slot Width | SXM Module | IGP |

| Power Connectors | null | None |

| Suggested PSU | 1400 W | null |

| Bus Interface | PCIe 6.0 x16 | PCIe 4.0 x16 |

| Display Outputs | No outputs | Portable Device Dependent |

| DirectX | N/A | 12 Ultimate (12_2) |

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.4 |

| Release Date | 2024-10-31 | 2023-01-02 |

| Predecessor | Server Hopper | GeForce 30 Mobile |

| Successor | Server Rubin | GeForce 50 Mobile |

| Launch MSRP | 34,999 USD | null |

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark scores between these two GPUs. However, the specification data provides clear performance indicators.

The B200 SXM6 dominates in memory bandwidth with 8.19 TB/s versus 576.0 GB/s, a factor of over fourteen. This directly supports its role in data-heavy server workloads. Its FP32 compute of 69.34 TFLOPS is 2.1 times the RTX 4090 Mobile’s 32.98 TFLOPS, and the same ratio applies to FP16 performance. The B200’s texture rate of 1,083.4 GTexel/s is roughly 2.1 times higher than the RTX 4090 Mobile’s 515.3 GTexel/s.

The RTX 4090 Mobile counters in pixel throughput. Its pixel rate of 189.8 GPixel/s is 4.3 times the B200’s 43.92 GPixel/s, driven by its 112 ROPs versus 24 on the B200. The RTX 4090 Mobile also has higher base and boost clocks at 1335 MHz and 1695 MHz versus the B200’s 120 MHz and 1830 MHz. The B200’s boost clock exceeds the RTX 4090 Mobile’s, but the base clock is drastically lower, reflecting different power management strategies.

The RTX 4090 Mobile has recorded benchmark results, including a Geekbench OpenCL score of 180,831, Geekbench Vulkan score of 170,774, Passmark DirectX 10 score of 173, DirectX 11 score of 262, DirectX 12 score of 107, DirectX 9 score of 310, G2D score of 984, G3D score of 27,212, and GPU compute score of 12,347. Its average benchmark score is 43,667 with a percentile of 84. The B200 has no benchmark scores listed, so its performance in standard graphics benchmarks cannot be quantified.

The RTX 4090 Mobile’s nearest rivals show tight competition: the Quadro M6000 scores 43,301 (0.8% higher), the RTX 5050 Mobile scores 43,268 (0.9% higher), the Quadro M6000 24 GB scores 43,262 (0.9% higher), and the RTX A6000 scores 44,075 (0.9% lower). These deltas indicate the RTX 4090 Mobile sits near the middle of its peer group in average benchmark score.

The B200’s 50th percentile among all GPUs, combined with zero recorded benchmarks, suggests it is not evaluated on the same consumer-oriented test suite as the RTX 4090 Mobile. The data indicates the B200 is designed for server compute, where its memory capacity and bandwidth matter more than pixel rate or API support. The RTX 4090 Mobile, with its 84th percentile and comprehensive API support, serves a distinct market segment focused on graphics and mobile workloads.