NVIDIA B300 SXM6 AC vs NVIDIA RTX A5500 Mobile Comparison

Head-to-Head Benchmarks

The recorded data contains a single direct benchmark comparison between these two accelerators, and the result is decisive. In the Geekbench OpenCL test, the NVIDIA B300 SXM6 AC scored 369,831 points against 124,287 for the NVIDIA RTX A5500 Mobile. That translates to a delta of 197.6%, meaning the B300 SXM6 AC delivers nearly three times the raw compute throughput in this workload. This is not a marginal advantage; it is a generational chasm in performance capability.

Context from the nearest rivals further underscores the B300 SXM6 AC's position. The database shows the B300 SXM6 AC sits at the 100th percentile among all GPUs, with its closest competitor, the NVIDIA B200, trailing by 7% at 345,482 points. The NVIDIA H200 NVL follows at 334,891 (10.4% behind), the AMD Instinct MI300X at 317,994 (16.3% behind), and the NVIDIA L40S at 295,763 (25% behind). Every one of these rivals is a high-end data center part, yet the B300 SXM6 AC outpaces them all by double-digit percentages in the OpenCL test.

The RTX A5500 Mobile, by contrast, occupies the 94th percentile, which is still a strong position for a mobile workstation GPU. Its nearest rivals cluster tightly around its score: the NVIDIA Tesla V100 SXM2 16 GB sits at 114,395 (just 0.4% ahead), the NVIDIA RTX 4000 SFF Ada Generation at 117,088 (2.7% ahead), the AMD Radeon PRO W7900 at 110,725 (2.9% behind), and the NVIDIA GB10 at 117,393 (2.9% ahead). This tells a clear story: the RTX A5500 Mobile is competitive within its own performance tier, trading places with other mid-range professional GPUs, while the B300 SXM6 AC operates in an entirely separate performance stratum.

The head-to-head table records one win for the B300 SXM6 AC and zero for the RTX A5500 Mobile. There is no benchmark in the database where the mobile part comes out ahead. The OpenCL gap alone, at 197.6%, is so large that even accounting for the RTX A5500 Mobile's additional Vulkan score of 103,601 (which has no B300 equivalent in the recorded data), the aggregate picture remains one of overwhelming dominance by the server part.

Architecture Differences

The architectural divide between these two GPUs is stark and explains the benchmark delta. The B300 SXM6 AC is built on the Blackwell Ultra architecture, using the GB110 chip fabricated on a 5 nm process at TSMC. The RTX A5500 Mobile relies on the older Ampere architecture, built on the GA103 chip at Samsung's 8 nm node. This process difference alone, 5 nm versus 8 nm, accounts for a substantial portion of the efficiency and density gap.

Transistor counts reinforce the generational leap. The B300 SXM6 AC packs 208,000 million transistors onto a 1628 mm² die, yielding a transistor density of 127.8 million per square millimeter. The RTX A5500 Mobile contains 22,000 million transistors on a 496 mm² die, for a density of 44.4 million per square millimeter. The B300 SXM6 AC has roughly 9.5 times the transistor count and more than three times the die area, with nearly three times the density per unit area. This is not an incremental improvement; it is a complete redesign at a different scale.

Memory architecture differs fundamentally as well. The B300 SXM6 AC uses 288 GB of HBM3e memory on an 8192-bit bus, delivering 8.19 TB/s of bandwidth. The RTX A5500 Mobile uses 16 GB of GDDR6 on a 256-bit bus, with 512.0 GB/s of bandwidth. The server part has 18 times the memory capacity and 16 times the memory bandwidth. The memory clock is listed identically at 2000 MHz for both, but the effective data rates differ: 8 Gbps for the B300 versus 16 Gbps for the RTX A5500 Mobile, reflecting the different memory technologies.

Compute resources show a similar scale disparity. The B300 SXM6 AC contains 18,944 shading units, 592 TMUs, and 592 tensor cores, but only 24 ROPs. The RTX A5500 Mobile has 7,424 shading units, 232 TMUs, 232 tensor cores, and 96 ROPs. The B300 has 2.55 times the shading units, 2.55 times the TMUs, and 2.55 times the tensor cores, but the RTX A5500 Mobile has four times the ROP count. The RTX A5500 Mobile also includes 58 dedicated RT cores, while the B300 SXM6 AC lists no RT core count in the database, suggesting a different prioritization of compute resources.

The B300 SXM6 AC also carries a PCIe 6.0 x16 interface, while the RTX A5500 Mobile uses PCIe 4.0 x16. The server part has no display outputs, consistent with its accelerator role, whereas the mobile part's outputs are listed as "Portable Device Dependent." The B300 SXM6 AC has no API support entries (DirectX, OpenGL, Vulkan all listed as N/A), while the RTX A5500 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. This reflects the B300's server-only orientation versus the RTX A5500 Mobile's workstation and mobile graphics role.

Where Each One Wins

The B300 SXM6 AC wins in every scenario that prioritizes raw compute throughput, massive memory capacity, and extreme bandwidth. The OpenCL score of 369,831, combined with the 288 GB HBM3e pool and 8.19 TB/s bandwidth, positions it for large-scale data center workloads: training large language models, scientific simulations, and high-performance computing tasks that need to hold enormous datasets in memory. The 76.99 TFLOPS of FP32 and FP16 (at 1:1 ratio) provide the arithmetic headroom for dense compute kernels. The 1,202.9 GTexel/s texture rate and 48.77 GPixel/s pixel rate, while unusual for a server part with only 24 ROPs, indicate a design focused on compute rather than rasterization.

The RTX A5500 Mobile wins in scenarios requiring portability, API compatibility, and graphics output. Its 165 W TDP, versus the B300's 1100 W, makes it feasible for laptop form factors. The presence of RT cores, Vulkan 1.4 support, and DirectX 12 Ultimate means it can handle ray-traced graphics and modern game workloads, something the B300 SXM6 AC cannot do at all given its N/A API entries. The 144.0 GPixel/s pixel rate, nearly three times the B300's, and the 96 ROPs indicate a part designed for actual rendering, not just compute. The Vulkan score of 103,601, while far below the B300's OpenCL result, demonstrates real graphics capability on the mobile part.

The RTX A5500 Mobile's nearest rivals, including the Tesla V100 and RTX 4000 SFF, all sit within a few percentage points of its score, suggesting it occupies a specific niche in the mobile professional segment. The B300 SXM6 AC's rivals, by contrast, are all server-class accelerators, and it beats each by at least 7%. The data implies that the B300 is the choice when the task is pure acceleration at any power cost, while the RTX A5500 Mobile is the choice when the task requires graphics, mobility, or both.

Specification Differences

| Specification | NVIDIA B300 SXM6 AC | NVIDIA RTX A5500 Mobile |

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

| Architecture | Blackwell Ultra | Ampere |

| Chip | GB110 | GA103 |

| Process Node | 5 nm | 8 nm |

| Foundry | TSMC | Samsung |

| Transistors | 208,000 million | 22,000 million |

| Die Size | 1628 mm² | 496 mm² |

| Transistor Density | 127.8M / mm² | 44.4M / mm² |

| Base Clock | 1665 MHz | 975 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 | 7424 |

| TMUs | 592 | 232 |

| ROPs | 24 | 96 |

| RT Cores | N/A | 58 |

| Tensor Cores | 592 | 232 |

| Pixel Rate | 48.77 GPixel/s | 144.0 GPixel/s |

| Texture Rate | 1,202.9 GTexel/s | 348.0 GTexel/s |

| FP32 | 76.99 TFLOPS | 22.27 TFLOPS |

| FP16 | 76.99 TFLOPS (1:1) | 22.27 TFLOPS (1:1) |

| TDP | 1100 W | 165 W |

| 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 | 2025-09-10 | 2022-03-21 |

| Predecessor | Server Hopper | Quadro Turing-M |

| Successor | Server Rubin | Ada-MW |

The specification table shows a clear division: the B300 SXM6 AC is a current-generation server accelerator with production status "Active," while the RTX A5500 Mobile is an end-of-life mobile workstation part. The B300 was released on September 10, 2025, while the RTX A5500 Mobile came out on March 21, 2022, a gap of over three years. The B300's successor is listed as Server Rubin, while the RTX A5500 Mobile's successor is Ada-MW.

FAQ

Q: How much faster is the NVIDIA B300 SXM6 AC than the RTX A5500 Mobile in OpenCL?

A: The B300 SXM6 AC scores 369,831 versus 124,287 for the RTX A5500 Mobile, a delta of 197.6%.

Q: What memory configuration does each GPU use?

A: The B300 SXM6 AC has 288 GB of HBM3e on an 8192-bit bus with 8.19 TB/s bandwidth. The RTX A5500 Mobile has 16 GB of GDDR6 on a 256-bit bus with 512.0 GB/s bandwidth.

Q: Which GPU supports graphics APIs like DirectX and Vulkan?

A: The RTX A5500 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The B300 SXM6 AC lists N/A for all three APIs.

Q: What is the power consumption difference?

A: The B300 SXM6 AC has a TDP of 1100 W, while the RTX A5500 Mobile has a TDP of 165 W.

Q: How does each GPU compare to its nearest rivals?

A: The B300 SXM6 AC leads its closest rival, the B200, by 7%, and beats the H200 NVL by 10.4%, the MI300X by 16.3%, and the L40S by 25%. The RTX A5500 Mobile is within 2.9% of the GB10, RTX 4000 SFF, and Tesla V100, and leads the Radeon PRO W7900 by 2.9%.

Q: What are the production statuses of these two GPUs?

A: The B300 SXM6 AC is listed as Active, while the RTX A5500 Mobile is listed as End-of-life.

The Verdict

The data points to two different tools for two different jobs. The NVIDIA B300 SXM6 AC is a server accelerator designed for maximum compute throughput, memory capacity, and bandwidth, with no consideration for graphics output or power efficiency. Its 100th percentile ranking, 369,831 OpenCL score, and 197.6% lead over the RTX A5500 Mobile make it the clear choice for data center workloads where every available watt is spent on raw performance. The 288 GB HBM3e memory and 8.19 TB/s bandwidth enable working with massive models and datasets that would be impossible on the mobile part. Its nearest rivals are all server-class accelerators, and it beats each of them by at least 7%, confirming its position at the top of the performance hierarchy.

The NVIDIA RTX A5500 Mobile, at the 94th percentile, is a capable mobile workstation GPU for its generation, but it is end-of-life and operates in a completely different performance class. Its 124,287 OpenCL score places it among peers like the Tesla V100 and RTX 4000 SFF, all within a few percentage points. The 165 W TDP, RT cores, and full graphics API support make it suitable for portable workstations where rendering, ray tracing, and mobility matter more than raw compute. The 16 GB GDDR6 memory and 512.0 GB/s bandwidth are adequate for professional graphics workloads but cannot approach the B300's scale.

The verdict is straightforward: choose the B300 SXM6 AC for any workload that demands maximum compute, massive memory, or extreme bandwidth, and where power consumption and physical size are irrelevant. Choose the RTX A5500 Mobile for mobile or graphics-centric tasks where portability, API compatibility, and rendering capability are required. The benchmark data shows no scenario where the RTX A5500 Mobile outperforms the B300 SXM6 AC in raw compute, but the mobile part's feature set, including RT cores and Vulkan support, gives it a distinct role that the server part cannot fulfill. The B300 SXM6 AC is the performance king; the RTX A5500 Mobile is the versatile, portable specialist.