NVIDIA B300 SXM6 AC vs NVIDIA RTX A4500 Mobile Comparison

Head-to-Head Benchmarks

The database records a single head-to-head comparison between these two accelerators, and the result is decisively one-sided. In the Geekbench OpenCL test, the NVIDIA B300 SXM6 AC scores 369,831 points against 105,307 points for the NVIDIA RTX A4500 Mobile. That is a 251.2% advantage for the server part, meaning the B300 delivers roughly three and a half times the raw compute throughput of the mobile workstation GPU in this workload.

Context from the nearest rivals list reinforces how dominant the B300 result is. The B300 sits at the 100th percentile of all GPUs in the database, a perfect score that no other recorded part matches. Its closest competitor, the NVIDIA B200, averages 345,482 points, which is 7% behind. The NVIDIA H200 NVL trails by 10.4% with 334,891 points, while the AMD Instinct MI300X scores 317,994, a 16.3% deficit. Even the NVIDIA L40S, a substantial data center accelerator in its own right, manages only 295,763 points, 25% below the B300.

The RTX A4500 Mobile, by contrast, occupies the 93rd percentile across all GPUs. Its average benchmark score across the two recorded tests is 91,134 points. Its nearest rival, the desktop NVIDIA RTX A4500, scores 91,671 points, which is actually 0.6% higher than the mobile part. The AMD Radeon Instinct MI60 is 1.4% ahead at 92,466 points. The NVIDIA Quadro GP100 trails the mobile part by 4.2% with 87,445 points, and the AMD Radeon PRO W7600 is 4.6% behind at 87,108 points. In other words, the mobile GPU is competitive within its own class, but that class operates on a completely different performance plane from the B300.

The OpenCL gap of 251.2% is not a marginal difference that could be explained by driver tuning or thermal conditions. It reflects a fundamental divide in silicon scale, memory bandwidth, and power envelope between a 1100 W server module and a 140 W mobile workstation GPU. The B300's single recorded benchmark score of 369,831 is more than three times the A4500 Mobile's best OpenCL result, and the delta is large enough that no workload optimization on the mobile side could plausibly close it.

Architecture Differences

The two GPUs come from different generations of NVIDIA's design roadmaps. The B300 SXM6 AC is built on the Blackwell Ultra architecture, using the GB110 chip, and belongs to the Server Blackwell (Bxx) generation. It is fabricated on a 5 nm TSMC process node and packs 208,000 million transistors onto a 1628 mm² die, yielding a transistor density of 127.8M per mm². The RTX A4500 Mobile uses the older Ampere architecture with the GA104 chip, from the Ampere-MW (Ax000) generation. It uses an 8 nm Samsung process, with 17,400 million transistors on a 392 mm² die, giving a transistor density of 44.4M per mm².

The transistor count disparity is enormous: the B300 integrates roughly twelve times as many transistors as the A4500 Mobile. This is not simply a matter of a bigger chip, though the die area is more than four times larger. The B300 also achieves a much higher transistor density, 127.8M per mm² versus 44.4M per mm², reflecting both the newer process node and the design priorities of a data center accelerator.

Memory architecture separates the two even further. The B300 ships with 288 GB of HBM3e memory on an 8192 bit bus, delivering 8.19 TB/s of bandwidth. The A4500 Mobile has 16 GB of GDDR6 on a 256 bit bus, with 512.0 GB/s of bandwidth. The B300 therefore offers 18 times the memory capacity and 16 times the memory bandwidth. For workloads that scale with memory footprint or bandwidth, such as large language model inference or high-resolution scientific computing, this gap is decisive.

Compute resources also diverge sharply. The B300 has 18,944 shading units, 592 TMUs, and 24 ROPs. The A4500 Mobile has 5,888 shading units, 184 TMUs, and 96 ROPs. The B300 leads in shading units and texture units by wide margins, but the A4500 Mobile has four times the ROP count. That is a notable architectural difference: the mobile GPU has a higher pixel rate of 144.0 GPixel/s versus 48.77 GPixel/s for the B300, and it achieves this with far fewer resources because its ROP count is 96 versus 24. The B300 compensates with a massive texture rate of 1,202.9 GTexel/s compared to 276.0 GTexel/s.

Tensor core counts follow the same pattern as TMUs: 592 on the B300 versus 184 on the A4500 Mobile. The B300 also lists 592 tensor cores, matching its TMU count, while the A4500 Mobile has 46 RT cores, a feature the B300 does not list. FP32 throughput is 76.99 TFLOPS on the B300 versus 17.66 TFLOPS on the A4500 Mobile, and both parts deliver FP16 at a 1:1 ratio with their FP32 figures.

Clocks and power draw tell the rest of the story. The B300 runs at a 1665 MHz base and 2032 MHz boost, while the A4500 Mobile runs at 930 MHz base and 1500 MHz boost. The B300's thermal design power is 1100 W with a suggested PSU of 1500 W, while the A4500 Mobile has a 140 W TDP and no power connectors listed, relying on the host laptop's power delivery. The B300 uses PCIe 6.0 x16, while the A4500 Mobile uses PCIe 4.0 x16. The B300 has no display outputs, while the A4500 Mobile's outputs are listed as dependent on the portable device.

FAQ

Q: Which GPU has the higher benchmark score in the database?

A: The NVIDIA B300 SXM6 AC scores 369,831 in Geekbench OpenCL, while the NVIDIA RTX A4500 Mobile scores 105,307 in the same test, a 251.2% difference in favor of the B300.

Q: How does the B300 compare to its closest rival, the NVIDIA B200?

A: The B300 scores 369,831, which is 7% higher than the B200's average score of 345,482. The H200 NVL trails by 10.4% at 334,891, the AMD Instinct MI300X trails by 16.3% at 317,994, and the L40S trails by 25% at 295,763.

Q: Is the RTX A4500 Mobile competitive with its desktop counterpart?

A: The mobile part averages 91,134 points across two tests, while the desktop RTX A4500 averages 91,671 points, a 0.6% deficit. The AMD Radeon Instinct MI60 is 1.4% ahead, and the Quadro GP100 is 4.2% behind the mobile part.

Q: What memory configurations do the two GPUs use?

A: The B300 uses 288 GB of HBM3e on an 8192 bit bus with 8.19 TB/s bandwidth. The A4500 Mobile uses 16 GB of GDDR6 on a 256 bit bus with 512.0 GB/s bandwidth.

Q: Which GPU has more shading units?

A: The B300 has 18,944 shading units, while the A4500 Mobile has 5,888. The B300 also has 592 TMUs versus 184, and 592 tensor cores versus 184.

Q: What is the production status of each GPU?

A: The B300 is listed as Active, released in 2025, while the A4500 Mobile is listed as End-of-life, released in 2022.

Specification Differences

| Specification | NVIDIA B300 SXM6 AC | NVIDIA RTX A4500 Mobile |

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

| Architecture | Blackwell Ultra | Ampere |

| Chip | GB110 | GA104 |

| Generation | Server Blackwell (Bxx) | Ampere-MW (Ax000) |

| Process node | 5 nm | 8 nm |

| Foundry | TSMC | Samsung |

| Transistors | 208,000 million | 17,400 million |

| Die size | 1628 mm² | 392 mm² |

| Transistor density | 127.8M / mm² | 44.4M / mm² |

| Base clock | 1665 MHz | 930 MHz |

| Boost clock | 2032 MHz | 1500 MHz |

| Memory size | 288 GB | 16 GB |

| Memory type | HBM3e | GDDR6 |

| Memory bus width | 8192 bit | 256 bit |

| Memory bandwidth | 8.19 TB/s | 512.0 GB/s |

| Shading units | 18944 | 5888 |

| TMUs | 592 | 184 |

| ROPs | 24 | 96 |

| RT cores | Not listed | 46 |

| Tensor cores | 592 | 184 |

| Pixel rate | 48.77 GPixel/s | 144.0 GPixel/s |

| Texture rate | 1,202.9 GTexel/s | 276.0 GTexel/s |

| FP32 | 76.99 TFLOPS | 17.66 TFLOPS |

| FP16 | 76.99 TFLOPS (1:1) | 17.66 TFLOPS (1:1) |

| TDP | 1100 W | 140 W |

| Power connectors | Not listed | None |

| Suggested PSU | 1500 W | Not listed |

| 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 |

| Production status | Active | End-of-life |

| Release date | 2025 | 2022 |

| Predecessor | Server Hopper | Quadro Turing-M |

| Successor | Server Rubin | Ada-MW |

Where Each One Wins

The B300 SXM6 AC wins in every compute-heavy category that matters for data center workloads. Its FP32 throughput of 76.99 TFLOPS is more than four times the A4500 Mobile's 17.66 TFLOPS. Its texture rate of 1,202.9 GTexel/s is 4.4 times higher. Its memory bandwidth of 8.19 TB/s is 16 times higher, and its 288 GB capacity dwarfs the mobile part's 16 GB. For AI training, large-scale inference, and scientific simulation, the B300 is in a different league. The 251.2% OpenCL delta confirms this in practice.

The A4500 Mobile wins in categories related to rasterization efficiency and mobility. Its pixel rate of 144.0 GPixel/s is nearly three times the B300's 48.77 GPixel/s, and its ROP count of 96 is four times higher. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the B300 lists no graphics API support at all. The A4500 Mobile has display outputs, albeit dependent on the host device, while the B300 has none. Its 140 W TDP makes it suitable for laptop integration, while the B300 requires a 1500 W suggested PSU. For graphics rendering, workstation visualization, and portable use cases, the A4500 Mobile is the only one of the two that fits.

The RT cores on the A4500 Mobile, 46 of them, support hardware-accelerated ray tracing, a feature the B300 does not list. That makes the mobile part more appropriate for content creation and rendering workloads that rely on ray tracing. The B300, with no listed RT cores and no display outputs, is clearly not designed for such tasks.

The Verdict

The data supports a straightforward conclusion: these two GPUs are not competitors, and no user should choose between them for the same workload. The NVIDIA B300 SXM6 AC is a server accelerator for compute-heavy data center tasks. Its 369,831 OpenCL score, 100th percentile ranking, 288 GB of HBM3e memory, and 76.99 TFLOPS FP32 throughput make it appropriate for anyone running large-scale AI models, high-performance computing, or memory-bound scientific workloads. It outperforms its nearest rival, the B200, by 7%, and it leads the H200 NVL by 10.4% and the MI300X by 16.3%. The 1100 W TDP and SXM module form factor mean it belongs in a server chassis with substantial power delivery.

The NVIDIA RTX A4500 Mobile is an end-of-life mobile workstation GPU from the Ampere generation. Its 91,134 average score places it at the 93rd percentile, and it trades blows with the desktop RTX A4500 (0.6% behind), the MI60 (1.4% behind), the Quadro GP100 (4.2% ahead), and the Radeon PRO W7600 (4.6% ahead). Its 140 W TDP, 16 GB of GDDR6 memory, and 46 RT cores make it suitable for laptop-based graphics work, CAD, and rendering tasks that need some ray tracing capability. Its DirectX 12 Ultimate support and display outputs are features the B300 completely lacks.

The choice depends entirely on the use case. Buyers who need maximum compute throughput, massive memory capacity, and do not need display output should select the B300 SXM6 AC. Buyers who need a mobile GPU with graphics API support, ray tracing cores, display outputs, and modest power consumption should select the RTX A4500 Mobile. The two parts serve different markets, and the recorded benchmark data reflects that separation. The B300 wins the compute crown by a 251.2% margin in the head-to-head test, but the A4500 Mobile wins the mobility and graphics feature set. Neither part can substitute for the other.