NVIDIA B300 SXM6 AC vs NVIDIA GeForce RTX 5080 Comparison

The NVIDIA B300 SXM6 AC and the NVIDIA GeForce RTX 5080 represent two distinct extremes of NVIDIA’s Blackwell generation. The B300 is a server accelerator engineered for massive compute throughput, while the RTX 5080 is a client graphics card optimized for rendering and interactive workloads. The recorded data shows a single direct benchmark comparison between the two, but the broader benchmark suites and architectural specifications reveal a clear division of labor.

Where Each One Wins

The NVIDIA B300 SXM6 AC is the uncontested winner in raw compute performance. In the sole head-to-head benchmark recorded, Geekbench OpenCL, the B300 scores 369,831 against the RTX 5080’s 235,901. That is a 56.8% lead for the server part. The B300 also sits at the 100th percentile of all GPUs in the database, meaning no other recorded GPU outperforms it in average benchmark score. Its nearest rival, the NVIDIA B200, scores 345,482, which is 7% lower, and the AMD Instinct MI300X trails by 16.3% with a score of 317,994. The B300’s average benchmark score of 369,831 places it in a class of its own.

The RTX 5080 wins in every category related to client-side rendering and graphics output. It is the only one of the two with display outputs, offering 1x HDMI 2.1b and 3x DisplayPort 2.1b. It also supports a full suite of graphics APIs: DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The B300 lists no display outputs and its API support is marked as N/A. The RTX 5080’s benchmark suite is far more diverse, covering DirectX 9, 10, 11, 12, 2D, 3D, and compute tests. Its PassMark G3D score is 36,565, and its 3DMark Steel Nomad DX12 score is 8,637. These measurements indicate the RTX 5080 is designed for real-time graphics, while the B300 has no graphics pipeline to speak of.

The RTX 5080 also excels in pixel throughput. Its pixel rate is 293.1 GPixel/s, compared to the B300’s 48.77 GPixel/s. This is a direct consequence of the RTX 5080 having 112 ROPs versus the B300’s 24 ROPs. For any workload that requires rasterization, the RTX 5080 is the only viable option between the two.

Architecture Differences

Both chips are fabricated on a 5 nm TSMC process, but they diverge sharply in scale and composition. The B300 uses the GB110 chip with the Blackwell Ultra architecture, while the RTX 5080 uses the GB203 chip with the Blackwell 2.0 architecture. The B300 integrates 208,000 million transistors on a 1628 mm² die, resulting in a transistor density of 127.8 million per mm². The RTX 5080 has 45,600 million transistors on a 378 mm² die, with a density of 120.6 million per mm². The B300’s die is over four times larger in area and contains nearly five times the transistor count.

Memory configurations are equally divergent. The B300 features 288 GB of HBM3e memory on an 8192-bit bus, delivering 8.19 TB/s of bandwidth. The RTX 5080 uses 16 GB of GDDR7 on a 256-bit bus, with 960.0 GB/s of bandwidth. The B300’s memory bandwidth is more than eight times higher, which is critical for large-scale data processing. The B300’s memory clock is listed as 2000 MHz with 8 Gbps effective, while the RTX 5080 runs at 1875 MHz with 30 Gbps effective. The B300’s advantage comes from the sheer bus width, not the clock speed.

The compute units also differ. The B300 has 18,944 shading units, 592 TMUs, and 592 tensor cores. The RTX 5080 has 10,752 shading units, 336 TMUs, and 336 tensor cores, plus 84 RT cores. The B300 does not list RT cores, while the RTX 5080 includes dedicated ray tracing hardware. In terms of raw throughput, the B300 delivers 76.99 TFLOPS for both FP32 and FP16 (1:1 ratio). The RTX 5080 delivers 56.28 TFLOPS for both FP32 and FP16 (1:1 ratio). The B300 also leads in texture rate with 1,202.9 GTexel/s versus 879.3 GTexel/s for the RTX 5080.

Power and physical design reflect their intended environments. The B300 is an SXM Module with a 1100 W TDP and a suggested PSU of 1500 W. The RTX 5080 is a dual-slot card with a 360 W TDP and a suggested PSU of 750 W. The B300 connects via PCIe 6.0 x16, while the RTX 5080 uses PCIe 5.0 x16. The RTX 5080 has physical dimensions of 304 mm length, 137 mm height, and 40 mm width, while the B300’s dimensions are not recorded. The B300 has no power connectors listed, whereas the RTX 5080 uses a single 16-pin connector.

Head-to-Head Benchmarks

The only direct benchmark comparison in the database is Geekbench OpenCL. The B300 scores 369,831, and the RTX 5080 scores 235,901. The delta is 56.8% in favor of the B300. This single result is consistent with the B300’s position at the 100th percentile of all GPUs, while the RTX 5080 sits at the 87th percentile.

The RTX 5080’s average benchmark score across its entire suite is 56,083, which is dragged down by low PassMark DirectX scores (151 for DX12, 208 for DX10, 324 for DX11, 389 for DX9). Its strongest result is the Geekbench Vulkan score of 255,450, which is higher than its OpenCL score of 235,901. The B300 has no Vulkan score recorded, so the OpenCL result is the only point of comparison.

The B300’s nearest rivals provide context for its performance. The NVIDIA B200 scores 345,482 (7% lower), the NVIDIA H200 NVL scores 334,891 (10.4% lower), and the AMD Instinct MI300X scores 317,994 (16.3% lower). The NVIDIA L40S scores 295,763 (25% lower). The B300 leads all of them by a wide margin. The RTX 5080’s nearest rivals are much closer: the AMD Radeon 8060S scores 55,757 (0.6% lower), the AMD Radeon RX 6750 GRE 12 GB scores 55,698 (0.7% lower), and the AMD Radeon Pro W5700X scores 54,828 (2.3% lower). The AMD Radeon RX 9070 GRE scores 57,367, which is 2.2% higher than the RTX 5080’s average.

The data shows that the B300 is not just faster than the RTX 5080; it is in a different performance tier entirely. The 56.8% delta in OpenCL is larger than the gap between the B300 and its closest server rival, the B200, which is only 7%. The RTX 5080, by contrast, trades blows with AMD client GPUs within a 2.3% range.

The Verdict

The data indicates that the NVIDIA B300 SXM6 AC is the choice for compute-intensive workloads where memory capacity and bandwidth are paramount. Its 288 GB HBM3e memory, 8.19 TB/s bandwidth, and 76.99 TFLOPS FP32 performance place it at the top of the database’s performance rankings. The 100th percentile ranking and the 56.8% OpenCL lead over the RTX 5080 confirm its dominance in general-purpose compute. The B300’s nearest rivals, the B200 and H200 NVL, are 7% and 10.4% slower, respectively, which shows the B300 is the current leader in its class.

The NVIDIA GeForce RTX 5080 is the only option for interactive graphics and display output. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, and it provides HDMI and DisplayPort connections. Its 293.1 GPixel/s pixel rate and 112 ROPs are essential for rasterization, which the B300 cannot perform due to its lack of display outputs and minimal ROP count. The RTX 5080’s 84 RT cores enable hardware ray tracing, a feature entirely absent from the B300’s specification list. The RTX 5080 also has a significantly lower power requirement at 360 W versus 1100 W, making it suitable for a standard desktop environment, whereas the B300 requires a server platform.

The Verdict is straightforward: the B300 is for data centers and high-performance computing, where its massive memory and compute resources are used for AI training and scientific simulation. The RTX 5080 is for workstations and gaming systems, where its graphics pipeline and display outputs are necessary. No single GPU can replace the other in its intended role.

FAQ

Q: Which GPU has a higher OpenCL score?

A: The NVIDIA B300 SXM6 AC scores 369,831 in Geekbench OpenCL, which is 56.8% higher than the NVIDIA GeForce RTX 5080’s score of 235,901.

Q: What are the memory sizes and types?

A: The B300 has 288 GB of HBM3e memory, while the RTX 5080 has 16 GB of GDDR7 memory.

Q: Which GPU supports ray tracing?

A: The RTX 5080 includes 84 RT cores for hardware ray tracing. The B300 does not list RT cores in its specifications.

Q: What is the power consumption difference?

A: The B300 has a TDP of 1100 W with a suggested PSU of 1500 W. The RTX 5080 has a TDP of 360 W with a suggested PSU of 750 W.

Q: Which GPU has display outputs?

A: Only the RTX 5080 has display outputs, offering 1x HDMI 2.1b and 3x DisplayPort 2.1b. The B300 has no display outputs.

Q: How do their nearest rivals compare?

A: The B300’s closest rival is the NVIDIA B200 with an average score of 345,482, which is 7% lower. The RTX 5080’s closest rival is the AMD Radeon 8060S with a score of 55,757, which is 0.6% lower.