NVIDIA B300 SXM6 AC vs NVIDIA RTX A4500 Comparison

Head-to-Head Benchmarks

The database contains one directly comparable benchmark result between the NVIDIA B300 SXM6 AC and the NVIDIA RTX A4500: Geekbench OpenCL. In this test, the B300 SXM6 AC scores 369,831, while the RTX A4500 scores 141,837. This represents a 160.7% delta, meaning the B300 SXM6 AC delivers roughly 2.6 times the raw compute throughput of the RTX A4500 in this workload. The margin is decisive and reflects the fundamental positioning of these two products.

The RTX A4500, however, has additional benchmark entries in the database that the B300 SXM6 AC lacks. It records a 3DMark Steel Nomad DX12 score of 3,196 and a Geekbench Vulkan score of 129,980. The B300 SXM6 AC has no corresponding entries for these graphics-focused tests, as its API support is listed as N/A for DirectX, OpenGL, and Vulkan. This absence is telling: the B300 SXM6 AC is not designed for traditional graphics workloads, while the RTX A4500 is a workstation card with full graphics API support.

When examining the broader benchmark context, the B300 SXM6 AC sits at the 100th percentile among all GPUs in the database, while the RTX A4500 sits at the 93rd percentile. The average benchmark score for the B300 SXM6 AC is 369,831 (its sole benchmark), while the RTX A4500 averages 91,671 across its three tests. The RTX A4500's nearest rivals in the database include the NVIDIA RTX A4500 Mobile (average score 91,134, delta 0.6%), the AMD Radeon Instinct MI60 (average score 92,466, delta -0.9%), the NVIDIA Quadro GP100 (average score 87,445, delta 4.8%), and the AMD Radeon PRO W7600 (average score 87,108, delta 5.2%). These tight margins indicate that the RTX A4500 is squarely within the mid-range workstation segment, competing closely with mobile variants and previous-generation flagship workstation cards.

The B300 SXM6 AC, by contrast, faces a different set of rivals. Its nearest competitors include the NVIDIA B200 (average score 345,482, delta 7%), the NVIDIA H200 NVL (average score 334,891, delta 10.4%), the AMD Instinct MI300X (average score 317,994, delta 16.3%), and the NVIDIA L40S (average score 295,763, delta 25%). The B300 SXM6 AC leads each of these by substantial margins, and its closest rival, the B200, is still 7% behind. This places the B300 SXM6 AC at the very top of the accelerator hierarchy in the database.

Architecture Differences

The architectural gap between these two GPUs is generational and foundational. The B300 SXM6 AC is built on the Blackwell Ultra architecture with the GB110 chip, fabricated on a 5 nm process at TSMC. The RTX A4500 uses the Ampere architecture with the GA102 chip, fabricated on an 8 nm process at Samsung. The process node difference alone accounts for significant efficiency and density advantages for the newer part.

Transistor counts underscore the scale disparity. The B300 SXM6 AC packs 208,000 million transistors on a die size of 1,628 mm², yielding a transistor density of 127.8M per mm². The RTX A4500 contains 28,300 million transistors on a 628 mm² die, with a density of 45.1M per mm². The B300 SXM6 AC has roughly 7.3 times the transistor count and 2.6 times the die area, but nearly three times the transistor density. This reflects both the newer process node and the more advanced design.

Memory architecture differs fundamentally. The B300 SXM6 AC uses 288 GB of HBM3e with an 8,192-bit bus and 8.19 TB/s of bandwidth. The RTX A4500 uses 20 GB of GDDR6 with a 320-bit bus and 640.0 GB/s of bandwidth. The B300 SXM6 AC offers 12.8 times the bandwidth, which is critical for large-scale compute workloads that saturate memory. The RTX A4500's memory clock is listed at 2000 MHz with 16 Gbps effective, while the B300 SXM6 AC's memory clock is 2000 MHz with 8 Gbps effective, though the HBM3e implementation achieves far higher aggregate throughput due to the wider bus.

Compute resources also diverge sharply. The B300 SXM6 AC has 18,944 shading units, 592 TMUs, 24 ROPs, and 592 tensor cores. The RTX A4500 has 7,168 shading units, 224 TMUs, 96 ROPs, 56 RT cores, and 224 tensor cores. The B300 SXM6 AC has more than 2.6 times the shading units and TMUs, but the RTX A4500 has four times the ROP count. The B300 SXM6 AC does not list RT cores, while the RTX A4500 has 56, reflecting the B300 SXM6 AC's server compute focus versus the RTX A4500's workstation graphics focus.

Clock speeds tell a related story. The B300 SXM6 AC runs at a 1,665 MHz base and 2,032 MHz boost, while the RTX A4500 runs at 1,050 MHz base and 1,650 MHz boost. Despite the lower clocks on the RTX A4500, its pixel rate of 158.4 GPixel/s exceeds the B300 SXM6 AC's 48.77 GPixel/s, because the RTX A4500 has far more ROPs. Texture rate favors the B300 SXM6 AC at 1,202.9 GTexel/s versus 369.6 GTexel/s.

The B300 SXM6 AC delivers 76.99 TFLOPS for both FP32 and FP16 (1:1 ratio). The RTX A4500 delivers 23.65 TFLOPS for both FP32 and FP16 (1:1 ratio). The B300 SXM6 AC has 3.25 times the floating-point throughput in both precisions.

Power and physical specifications also differ substantially. The B300 SXM6 AC has a TDP of 1,100 W and a suggested PSU of 1,500 W, while the RTX A4500 has a TDP of 200 W and a suggested PSU of 550 W. The B300 SXM6 AC is an SXM Module with no display outputs and no power connectors listed, while the RTX A4500 is a dual-slot card with a single 8-pin connector and four DisplayPort 1.4a outputs. The RTX A4500 measures 267 mm in length and 112 mm in height. The B300 SXM6 AC has no physical dimensions listed.

Production statuses differ: the B300 SXM6 AC is Active, while the RTX A4500 is End-of-life. The B300 SXM6 AC released on 2025-09-10, while the RTX A4500 released on 2021-11-22. The B300 SXM6 AC's predecessor is Server Hopper and its successor is Server Rubin. The RTX A4500's predecessor is Quadro Turing and its successor is Workstation Ada.

FAQ

Q: Which GPU has higher raw compute performance?

A: The B300 SXM6 AC delivers 76.99 TFLOPS in both FP32 and FP16, compared to the RTX A4500's 23.65 TFLOPS in both precisions. This represents a 3.25 times advantage for the B300 SXM6 AC.

Q: How do their memory subsystems compare?

A: The B300 SXM6 AC uses 288 GB of HBM3e with an 8,192-bit bus and 8.19 TB/s bandwidth. The RTX A4500 uses 20 GB of GDDR6 with a 320-bit bus and 640.0 GB/s bandwidth. The B300 SXM6 AC has 12.8 times the memory bandwidth and 14.4 times the memory capacity.

Q: Which GPU supports graphics APIs?

A: The RTX A4500 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The B300 SXM6 AC lists N/A for DirectX, OpenGL, and Vulkan, and has no display outputs.

Q: What is the power consumption difference?

A: The B300 SXM6 AC has a TDP of 1,100 W and a suggested PSU of 1,500 W. The RTX A4500 has a TDP of 200 W and a suggested PSU of 550 W. The RTX A4500 consumes 900 W less.

Q: How does the B300 SXM6 AC compare to its nearest rival?

A: The B300 SXM6 AC scores 369,831 in Geekbench OpenCL, which is 7% ahead of the NVIDIA B200 (345,482), 10.4% ahead of the NVIDIA H200 NVL (334,891), 16.3% ahead of the AMD Instinct MI300X (317,994), and 25% ahead of the NVIDIA L40S (295,763).

Q: What is the production status of each GPU?

A: The B300 SXM6 AC is listed as Active, while the RTX A4500 is listed as End-of-life. The B300 SXM6 AC released on 2025-09-10, and the RTX A4500 released on 2021-11-22.

Specification Differences

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

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

| Architecture | Blackwell Ultra | Ampere |

| Chip | GB110 | GA102 |

| Process Node | 5 nm | 8 nm |

| Foundry | TSMC | Samsung |

| Transistors | 208,000 million | 28,300 million |

| Die Size | 1,628 mm² | 628 mm² |

| Transistor Density | 127.8M / mm² | 45.1M / mm² |

| Base Clock | 1,665 MHz | 1,050 MHz |

| Boost Clock | 2,032 MHz | 1,650 MHz |

| Memory Size | 288 GB | 20 GB |

| Memory Type | HBM3e | GDDR6 |

| Memory Bus Width | 8,192 bit | 320 bit |

| Memory Bandwidth | 8.19 TB/s | 640.0 GB/s |

| Shading Units | 18,944 | 7,168 |

| TMUs | 592 | 224 |

| ROPs | 24 | 96 |

| RT Cores | Not listed | 56 |

| Tensor Cores | 592 | 224 |

| Pixel Rate | 48.77 GPixel/s | 158.4 GPixel/s |

| Texture Rate | 1,202.9 GTexel/s | 369.6 GTexel/s |

| FP32 | 76.99 TFLOPS | 23.65 TFLOPS |

| FP16 | 76.99 TFLOPS | 23.65 TFLOPS |

| TDP | 1,100 W | 200 W |

| Slot Width | SXM Module | Dual-slot |

| Power Connectors | Not listed | 1x 8-pin |

| Suggested PSU | 1,500 W | 550 W |

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

| Display Outputs | No outputs | 4x DisplayPort 1.4a |

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

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.4 |

| Length | Not listed | 267 mm (10.5 inches) |

| Height | Not listed | 112 mm (4.4 inches) |

| Production Status | Active | End-of-life |

| Release Date | 2025-09-10 | 2021-11-22 |

| Predecessor | Server Hopper | Quadro Turing |

| Successor | Server Rubin | Workstation Ada |

Where Each One Wins

The B300 SXM6 AC wins decisively in compute throughput. Its Geekbench OpenCL score of 369,831 is 160.7% higher than the RTX A4500's 141,837. It has 3.25 times the FP32 and FP16 throughput, 12.8 times the memory bandwidth, and 14.4 times the memory capacity. Its 592 tensor cores versus 224 give it a 2.64 times advantage in tensor operations. The B300 SXM6 AC also has 3.25 times the texture rate, and its 1,202.9 GTexel/s versus 369.6 GTexel/s reflects a much higher fill rate for texture-heavy compute workloads. The B300 SXM6 AC leads its nearest rival, the B200, by 7%, and the H200 NVL by 10.4%, placing it at the top of the database's accelerator rankings.

The RTX A4500 wins in graphics-specific capabilities. It has 96 ROPs versus 24, giving it a pixel rate of 158.4 GPixel/s versus 48.77 GPixel/s. It has 56 RT cores for hardware ray tracing, which the B300 SXM6 AC does not list. The RTX A4500 supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the B300 SXM6 AC has no graphics API support. The RTX A4500 has four DisplayPort 1.4a outputs for display connectivity, while the B300 SXM6 AC has none. The RTX A4500 also wins on power efficiency: its 200 W TDP versus 1,100 W means it draws 900 W less, and its suggested PSU of 550 W versus 1,500 W reflects a much lower system power requirement. The RTX A4500's physical form factor as a dual-slot card with a single 8-pin connector makes it far easier to integrate into workstation systems compared to the SXM Module.

The RTX A4500's benchmark context shows it competing closely with its nearest rivals: it is 0.6% ahead of the RTX A4500 Mobile, 0.9% behind the AMD Radeon Instinct MI60, 4.8% ahead of the Quadro GP100, and 5.2% ahead of the AMD Radeon PRO W7600. These margins indicate the RTX A4500 is a solid mid-range workstation performer, but not a class leader. The B300 SXM6 AC, by contrast, has no rival within 7% in its benchmark, and its 100th percentile ranking confirms its position as the top-performing GPU in the database.

The Verdict

The data supports a clear separation of roles. The NVIDIA B300 SXM6 AC is a server-class accelerator designed for maximum compute density. Its 76.99 TFLOPS FP32 throughput, 288 GB HBM3e memory, and 8.19 TB/s bandwidth make it suitable for large-scale AI training, scientific simulation, and data-center compute workloads. Its 100th percentile ranking and 160.7% benchmark advantage over the RTX A4500 leave no ambiguity about its performance class. The B300 SXM6 AC's lack of display outputs, graphics API support, and RT cores confirms it is not intended for workstation graphics.

The NVIDIA RTX A4500 is a workstation GPU with a different mission. Its 23.65 TFLOPS FP32 throughput, 20 GB GDDR6 memory, and 640.0 GB/s bandwidth are modest by comparison, but its 96 ROPs, 56 RT cores, and full graphics API support (DirectX 12 Ultimate, OpenGL 4.6, Vulkan 1.4) make it suitable for professional visualization, CAD, and content creation. Its four DisplayPort 1.4a outputs enable multi-monitor setups that the B300 SXM6 AC cannot provide. Its 200 W TDP and dual-slot form factor allow it to fit into standard workstation chassis, whereas the B300 SXM6 AC requires a server platform with 1,500 W PSU support.

For buyers selecting between these two, the choice depends entirely on workload type. The B300 SXM6 AC is the correct choice for compute-centric deployments where raw throughput, memory capacity, and bandwidth are the limiting factors. The RTX A4500 is the correct choice for graphics-centric workstations where display output, ray tracing, and API compatibility are required. The B300 SXM6 AC's Active production status and 2025 release date indicate it is a current-generation product, while the RTX A4500's End-of-life status and 2021 release date suggest it is a previous-generation option. The RTX A4500's successor, Workstation Ada, and the B300 SXM6 AC's successor, Server Rubin, point to continued product evolution in both segments. The database shows no scenario where these two GPUs compete for the same workload; they serve distinct markets with distinct requirements.