GPU Comparison

Head-to-Head Benchmarks

The single head-to-head benchmark available, Geekbench OpenCL, produces a surprising result given the two cards’ positioning. The NVIDIA RTX 6000D scores 388,405, while the NVIDIA B300 SXM6 AC scores 369,831. That is a 4.8% victory for the workstation card, a delta that flips expectations for a product aimed at server racks. The B300 SXM6 AC, despite its massive 288 GB HBM3e memory and 8.19 TB/s bandwidth, trails the RTX 6000D in this synthetic compute test.

Context matters here. The B300’s nearest rival, the NVIDIA B200, averages 345,482, meaning the B300 leads its own server-class sibling by 7%. Against the H200 NVL, the B300 is 10.4% ahead (334,891), and it extends that margin to 16.3% over the AMD Instinct MI300X (317,994). The L40S trails by 25% at 295,763. So the B300 is clearly the dominant force in its own weight class. But the RTX 6000D’s OpenCL score of 388,405 places it ahead of every one of the B300’s rivals, including the B200.

What does this imply? The RTX 6000D’s higher raw FP32 throughput, 97.04 TFLOPS versus 76.99 TFLOPS, likely explains the OpenCL outcome. OpenCL workloads often scale with shading-unit count and clock speed, and the RTX 6000D has both: 19,968 shading units running at a 2,430 MHz boost, compared to the B300’s 18,944 units at 2,032 MHz. The data does not lie, but it also does not tell the whole story. The B300’s strengths lie elsewhere, in memory capacity and bandwidth, which OpenCL’s compute-heavy but bandwidth-light kernel mix may not fully stress.

The RTX 6000D’s own rival list shows a different competitive landscape. It sits just 0.8% above the Tesla V100S PCIe 32 GB (194,415) in average benchmark score, and 4.7% above the A100 SXM4 40 GB (187,147). Yet it also trails the A100 PCIe 80 GB by 5.4% (207,124) in that same average metric. The RTX 5000 Ada Generation is 6.1% behind at 184,664. This is a curious pattern: the RTX 6000D wins the head-to-head OpenCL test decisively but posts a lower average benchmark score than the B300, because the B300’s single OpenCL result is its entire average (369,831), while the RTX 6000D’s average (195,964) is dragged down by its 3DMark Steel Nomad DX12 score of 3,522. The two cards are not even measuring the same workloads in their benchmark suites.

Architecture Differences

The B300 SXM6 AC and RTX 6000D diverge fundamentally at the silicon level. The B300 uses the GB110 chip on Blackwell Ultra architecture, fabricated on TSMC’s 5 nm node. It packs 208,000 million transistors on a 1,628 mm² die, yielding a transistor density of 127.8M per mm². The RTX 6000D uses the GB202 chip on Blackwell 2.0 architecture, also on TSMC 5 nm, but with just 92,200 million transistors on a 750 mm² die, a density of 122.9M per mm². The B300’s die is more than twice the physical size, and its transistor count is 2.26 times higher.

Memory architecture is the starkest differentiator. The B300 runs 288 GB of HBM3e across an 8,192-bit bus, delivering 8.19 TB/s of bandwidth. The RTX 6000D uses 84 GB of GDDR7 on a 448-bit bus, achieving 1.40 TB/s. That is a 5.85x bandwidth advantage for the B300, and 3.43x more capacity. For workloads that stream large datasets, think inference batches or simulation checkpoints, the B300’s memory subsystem is in a different league. The RTX 6000D’s GDDR7 runs at 25 Gbps effective, while the B300’s HBM3e runs at 8 Gbps effective, but the B300’s bus width compensates overwhelmingly.

Compute resources tell a different story. The RTX 6000D has more shading units (19,968 vs 18,944), more TMUs (624 vs 592), and dramatically more ROPs (192 vs 24). The pixel rate difference is enormous: 466.6 GPixel/s for the RTX 6000D versus 48.77 GPixel/s for the B300. Texture rate also favors the RTX 6000D at 1,516.3 GTexel/s versus 1,202.9 GTexel/s. The RTX 6000D also has 156 dedicated RT cores; the B300’s RT core count is not specified in the data. Tensor core counts are close, 624 for the RTX 6000D versus 592 for the B300, but the B300’s tensor cores are presumably optimized for server AI workloads given the architecture positioning.

Clock speeds favor the RTX 6000D: base 1,992 MHz versus 1,665 MHz, boost 2,430 MHz versus 2,032 MHz. Power draw reflects the different design goals: the B300 consumes 1,100 W TDP with a 1,500 W suggested PSU, while the RTX 6000D draws 600 W TDP with a 1,000 W suggested PSU. The B300 is an SXM module with no display outputs; the RTX 6000D is a dual-slot PCIe card with 4x DisplayPort 2.1b. The B300 uses PCIe 6.0 x16, the RTX 6000D uses PCIe 5.0 x16. The RTX 6000D supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4; the B300 lists N/A for all three APIs.

FAQ

Q: Which card wins the Geekbench OpenCL benchmark?

A: The NVIDIA RTX 6000D wins with a score of 388,405 versus the B300 SXM6 AC’s 369,831, a 4.8% margin. This is the only head-to-head benchmark result in the data.

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

A: The B300 leads the NVIDIA B200 by 7% (345,482), the H200 NVL by 10.4% (334,891), the AMD Instinct MI300X by 16.3% (317,994), and the L40S by 25% (295,763). Its percentile rank is 100 among all GPUs.

Q: What is the memory capacity difference?

A: The B300 has 288 GB of HBM3e memory, while the RTX 6000D has 84 GB of GDDR7. The B300’s bandwidth is 8.19 TB/s versus 1.40 TB/s for the RTX 6000D.

Q: Why does the RTX 6000D have a lower average benchmark score than the B300?

A: The RTX 6000D’s average score of 195,964 includes both its OpenCL score (388,405) and its 3DMark Steel Nomad DX12 score (3,522), which drags the average down. The B300’s average equals its single OpenCL score of 369,831.

Q: What are the TDP requirements for each card?

A: The B300 SXM6 AC has a TDP of 1,100 W and a suggested PSU of 1,500 W. The RTX 6000D has a TDP of 600 W and a suggested PSU of 1,000 W.

Q: Which card supports display outputs?

A: Only the RTX 6000D has display outputs, 4x DisplayPort 2.1b. The B300 SXM6 AC has no outputs, consistent with its server module form factor.

Specification Differences

| Field | NVIDIA B300 SXM6 AC | NVIDIA RTX 6000D |

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

| Chip | GB110 | GB202 |

| Architecture | Blackwell Ultra | Blackwell 2.0 |

| Transistors | 208,000 million | 92,200 million |

| Die Size | 1628 mm² | 750 mm² |

| Transistor Density | 127.8M / mm² | 122.9M / mm² |

| Base Clock | 1665 MHz | 1992 MHz |

| Boost Clock | 2032 MHz | 2430 MHz |

| Memory Clock | 2000 MHz 8 Gbps effective | 1560 MHz 25 Gbps effective |

| Memory Size | 288 GB | 84 GB |

| Memory Type | HBM3e | GDDR7 |

| Memory Bus Width | 8192 bit | 448 bit |

| Memory Bandwidth | 8.19 TB/s | 1.40 TB/s |

| Shading Units | 18944 | 19968 |

| TMUs | 592 | 624 |

| ROPs | 24 | 192 |

| RT Cores | Not specified | 156 |

| Tensor Cores | 592 | 624 |

| Pixel Rate | 48.77 GPixel/s | 466.6 GPixel/s |

| Texture Rate | 1,202.9 GTexel/s | 1,516.3 GTexel/s |

| FP32 | 76.99 TFLOPS | 97.04 TFLOPS |

| FP16 | 76.99 TFLOPS (1:1) | 97.04 TFLOPS (1:1) |

| TDP | 1100 W | 600 W |

| Slot Width | SXM Module | Dual-slot |

| Power Connectors | Not specified | 1x 16-pin |

| Suggested PSU | 1500 W | 1000 W |

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

| Display Outputs | No outputs | 4x DisplayPort 2.1b |

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

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.4 |

| Dimensions (LxHxW) | Not specified | 304 mm x 137 mm x 40 mm |

| Release Date | 2025-09-10 | 2025-07-13 |

| Successor | Server Rubin | Not specified |

| Launch MSRP | Not specified | 8,565 USD |

Where Each One Wins

The B300 SXM6 AC wins decisively on memory capacity and bandwidth. With 288 GB versus 84 GB, and 8.19 TB/s versus 1.40 TB/s, the B300 is built for datasets that exceed the RTX 6000D’s total memory. The B300’s 100th percentile ranking among all GPUs, and its 7% lead over the B200, place it at the top of the server hierarchy. Its 25% margin over the L40S and 16.3% over the MI300X further cement that position. The B300 also draws more power (1,100 W) and uses an SXM module form factor, which suits dense server deployments where per-GPU power is less constrained.

The RTX 6000D wins on raw compute throughput and graphics features. Its FP32 performance of 97.04 TFLOPS exceeds the B300’s 76.99 TFLOPS by 26%. The RTX 6000D has 156 RT cores, which the B300 lacks entirely in the specification data. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, the B300 supports none of these APIs. The RTX 6000D’s 4x DisplayPort 2.1b outputs enable direct display connectivity, which the B300 cannot offer. Its 466.6 GPixel/s pixel rate is 9.6x higher than the B300’s 48.77 GPixel/s, making it the obvious choice for rasterization-heavy workflows. The RTX 6000D also wins the OpenCL head-to-head by 4.8%, despite its lower average benchmark score overall.

The RTX 6000D’s rival list shows it is competitive in the professional GPU space: it edges out the Tesla V100S by 0.8% and the A100 SXM4 by 4.7%, while trailing the A100 PCIe 80 GB by 5.4% and beating the RTX 5000 Ada by 6.1%. These margins are narrow, suggesting the RTX 6000D sits near the top of its class but does not dominate it. The B300’s rival margins are much larger, indicating a clearer performance tier separation in the server segment.

The Verdict

The data points to two different buyers. The B300 SXM6 AC is for organizations running large-scale AI inference or training where memory capacity is the bottleneck. Its 288 GB HBM3e pool and 8.19 TB/s bandwidth are unmatched by anything in its rival set. The 7% lead over the B200 and 10.4% over the H200 NVL show it is the fastest server GPU in its immediate family. The lack of display outputs, the SXM form factor, and the 1,100 W TDP all signal a data-center-only product. Its 100th percentile ranking reflects that it is the absolute top performer in the aggregate benchmark database.

The RTX 6000D is for professionals who need both compute and graphics. It wins the OpenCL test, offers 26% more FP32 throughput, and adds RT cores, display outputs, and full graphics API support. Its 600 W TDP and dual-slot design make it installable in standard workstation chassis. The 4x DisplayPort 2.1b outputs mean it can drive multiple high-resolution displays. The 3,522 score in 3DMark Steel Nomad DX12, while not directly comparable to the B300 (which has no such result), indicates it can handle modern graphics workloads. Its rivals, the V100S, A100 variants, and RTX 5000 Ada, are all older or lower-tier products, and the RTX 6000D beats three of the four in average score.

Choose the B300 if the workload is pure compute with massive memory requirements. Choose the RTX 6000D if the workload demands graphics, display output, or higher FP32 throughput. The 4.8% OpenCL gap is real but narrow; the memory gap is enormous. The B300’s 288 GB is 3.43x the RTX 6000D’s 84 GB, and its bandwidth is 5.85x higher. No benchmark in the data shows the RTX 6000D beating the B300 on memory-bound tasks, because no such test exists. The absence of that data is itself informative: the two cards serve different masters.