NVIDIA B300 SXM6 AC vs NVIDIA RTX 4000 Ada Generation Comparison

Where Each One Wins

The benchmark record splits cleanly along workload boundaries. The NVIDIA B300 SXM6 AC wins the only shared test in the database, the Geekbench OpenCL suite, with a score of 369,831 versus 146,593 for the NVIDIA RTX 4000 Ada Generation. That is a 152.3% delta, a decisive margin that places the B300 in the 100th percentile of all GPUs tracked, meaning no other recorded part scores higher. The RTX 4000 Ada, by contrast, sits in the 95th percentile with an average benchmark score of 135,218 across its two recorded tests, and it has one additional result, Geekbench Vulkan at 123,842, that the B300 cannot match because the B300 has no graphics API support at all.

The B300 SXM6 AC is clearly optimized for compute-heavy, data-center-style workloads. Its single OpenCL score of 369,831 is its entire benchmark footprint, and its hardware profile reinforces that focus: 288 GB of HBM3e memory, 8.19 TB/s of bandwidth, 18,944 shading units, and 592 tensor cores. There are no display outputs, no DirectX, OpenGL, or Vulkan support, and the board is an SXM module, not a plug-in card. The data indicates this part exists for massive parallel throughput, large model training, and scientific simulation where a single GPU must absorb enormous data sets.

The RTX 4000 Ada Generation wins the practical versatility category. It posts a Vulkan score of 123,842, a result that is entirely absent for the B300, and it offers 4x DisplayPort 1.4a outputs, DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 support. Its 20 GB of GDDR6 memory with 360.0 GB/s bandwidth is far smaller than the B300, but its 139.2 GPixel/s pixel rate is nearly triple the B300's 48.77 GPixel/s, and its 64 ROPs dwarf the B300's 24. The RTX 4000 is built for rasterization, real-time graphics, and workstation visualization, while the B300 is built for raw number crunching. Benchmark results indicate that each card wins in its own domain, with no overlap in the shared OpenCL test being remotely competitive.

Architecture Differences

The two GPUs come from different architectural families and target different market segments. The B300 uses the GB110 chip on the Blackwell Ultra architecture, fabricated by TSMC on a 5 nm process. It packs 208,000 million transistors into a 1628 mm² die, giving a transistor density of 127.8 million per square millimeter. The RTX 4000 Ada uses the AD104 chip on the Ada Lovelace architecture, also TSMC 5 nm, but with 35,800 million transistors on a 294 mm² die, a density of 121.8 million per square millimeter. The B300 has nearly six times the transistor count and a die over five times larger, a scale difference that explains its compute dominance.

Memory systems are fundamentally different. The B300 uses 288 GB of HBM3e across an 8192-bit bus, delivering 8.19 TB/s of bandwidth. The RTX 4000 uses 20 GB of GDDR6 on a 160-bit bus, delivering 360.0 GB/s. That is a 22.75x bandwidth advantage for the B300, which is the single largest architectural gap between the two parts. Memory clock rates also differ: the B300 runs at 2000 MHz with 8 Gbps effective, while the RTX 4000 runs at 2250 MHz with 18 Gbps effective, but the narrower bus on the RTX 4000 negates the per-pin speed advantage.

Compute resources diverge sharply. The B300 has 18,944 shading units, 592 TMUs, and 592 tensor cores, but only 24 ROPs. The RTX 4000 has 6,144 shading units, 192 TMUs, 64 ROPs, 48 RT cores, and 192 tensor cores. The B300 has no RT core count listed, and its API support is marked N/A across the board. The RTX 4000 has dedicated RT cores and full graphics API coverage. The B300's FP32 throughput is 76.99 TFLOPS with FP16 at 76.99 TFLOPS (1:1), while the RTX 4000 delivers 26.73 TFLOPS for both FP32 and FP16 (1:1). The B300 is roughly 2.88x faster in raw floating-point work, but the RTX 4000's pixel rate of 139.2 GPixel/s versus 48.77 GPixel/s shows that rasterization throughput favors the workstation card.

Power and physical design also differ. The B300 is an SXM module with a 1100 W TDP and a suggested PSU of 1500 W, plus PCIe 6.0 x16 connectivity. The RTX 4000 is a single-slot card, 245 mm long and 112 mm tall, with a 130 W TDP, a suggested PSU of 300 W, one 16-pin power connector, and PCIe 4.0 x16. The B300 has no power connector listed because it is a module, not a card. The RTX 4000 has no display outputs on the B300, while the RTX 4000 provides four DisplayPort 1.4a connections. The B300's release date is September 10, 2025, and its predecessor is Server Hopper, while the RTX 4000 launched August 8, 2023, with Workstation Ampere as its predecessor.

Head-to-Head Benchmarks

The only directly comparable benchmark in the database is Geekbench OpenCL. The B300 scores 369,831, and the RTX 4000 scores 146,593. The B300 wins by 152.3%, a gap that places it 7% ahead of the NVIDIA B200, 10.4% ahead of the NVIDIA H200 NVL, 16.3% ahead of the AMD Instinct MI300X, and 25% ahead of the NVIDIA L40S. Those nearest rivals all sit above the RTX 4000's result, reinforcing that the B300 operates in a performance tier that the RTX 4000 cannot reach. The RTX 4000's nearest rivals, by contrast, are the NVIDIA A10M at 135,230 (0% delta), the AMD Radeon PRO W6800 at 135,396 (0.1% behind), the AMD Radeon Pro W6800X Duo at 135,774 (0.4% behind), and the AMD Radeon PRO V620 at 136,472 (0.9% behind). The RTX 4000's average score of 135,218 is essentially tied with these midrange workstation parts, all within a 0.9% band.

The Vulkan result for the RTX 4000, 123,842, is not directly comparable to any B300 number because the B300 has no Vulkan support. However, the RTX 4000's Vulkan score is 15.5% lower than its own OpenCL score, suggesting that even in its strongest API environment, it does not approach the B300's raw compute output. The B300's OpenCL score alone is 2.52x the RTX 4000's OpenCL score, and 2.99x the RTX 4000's Vulkan score. Texture rate tells a similar story: the B300 delivers 1,202.9 GTexel/s versus 417.6 GTexel/s for the RTX 4000, a 2.88x advantage. Pixel rate inverts the trend, with the RTX 4000 at 139.2 GPixel/s versus 48.77 GPixel/s for the B300, a 2.85x advantage for the workstation card.

The B300's 76.99 TFLOPS FP32 performance is 2.88x the RTX 4000's 26.73 TFLOPS, and its 8.19 TB/s memory bandwidth is 22.75x the RTX 4000's 360.0 GB/s. The RTX 4000's higher boost clock, 2175 MHz versus 2032 MHz for the B300, does not compensate for the massive core count difference. The B300's base clock of 1665 MHz is also higher than the RTX 4000's 1500 MHz base. The RTX 4000 does win on ROP count, 64 versus 24, and on pixel fillrate, but those metrics matter for graphics output, which the B300 does not provide.

The Verdict

The data dictates a clear separation of use cases. The NVIDIA B300 SXM6 AC is the choice for compute-bound workloads that need maximum FP32 and FP16 throughput, enormous memory capacity, and extreme bandwidth. Its 369,831 OpenCL score, 100th percentile ranking, 76.99 TFLOPS, and 288 GB HBM3e make it a server-class accelerator for large-scale parallel processing. Its lack of display outputs and graphics API support means it cannot serve as a workstation card for visual tasks. The RTX 4000 Ada Generation is the choice for graphics-intensive workstation workloads that require rasterization, ray tracing, and API compatibility. Its 123,842 Vulkan score, 139.2 GPixel/s pixel rate, 64 ROPs, and 48 RT cores, combined with four DisplayPort outputs, make it a capable single-slot card for professional visualization, though its 20 GB memory and 360.0 GB/s bandwidth limit it to smaller data sets.

The 152.3% OpenCL delta is not a close contest. The B300 outperforms every rival in its nearest category, while the RTX 4000 trades blows within a 0.9% band of its nearest competitors. The B300 has no Vulkan score, and the RTX 4000 has no path to the B300's compute tier. The B300's 1100 W TDP versus the RTX 4000's 130 W TDP also signals different deployment environments: the B300 requires a server chassis with substantial power delivery, while the RTX 4000 fits into a standard workstation with a 300 W PSU recommendation. For buyers who need a display-capable GPU with balanced compute and graphics, the RTX 4000 is the only option in this comparison. For buyers who need maximum compute density and can forgo graphics entirely, the B300 is the clear winner.

FAQ

Q: Which GPU has the higher OpenCL benchmark score?

A: The NVIDIA B300 SXM6 AC scores 369,831, which is 152.3% higher than the NVIDIA RTX 4000 Ada Generation's 146,593 in Geekbench OpenCL.

Q: Does the RTX 4000 Ada Generation support Vulkan?

A: Yes. The RTX 4000 Ada records a Geekbench Vulkan score of 123,842. The B300 SXM6 AC has no Vulkan support, with its API fields marked N/A.

Q: How does memory capacity compare between the two cards?

A: The B300 SXM6 AC has 288 GB of HBM3e memory with an 8192-bit bus and 8.19 TB/s bandwidth. The RTX 4000 Ada has 20 GB of GDDR6 memory with a 160-bit bus and 360.0 GB/s bandwidth.

Q: What is the pixel fillrate difference?

A: The RTX 4000 Ada delivers 139.2 GPixel/s, which is 2.85x the B300's 48.77 GPixel/s. This reflects the RTX 4000's focus on rasterization and display output.

Q: Which GPU is more power-hungry?

A: The B300 SXM6 AC has a 1100 W TDP and a suggested PSU of 1500 W. The RTX 4000 Ada has a 130 W TDP and a suggested PSU of 300 W.

Q: What are the nearest rivals for each GPU?

A: For the B300, nearest rivals include the NVIDIA B200 (7% behind), NVIDIA H200 NVL (10.4% behind), AMD Instinct MI300X (16.3% behind), and NVIDIA L40S (25% behind). For the RTX 4000, nearest rivals include the NVIDIA A10M (0% delta), AMD Radeon PRO W6800 (0.1% behind), AMD Radeon Pro W6800X Duo (0.4% behind), and AMD Radeon PRO V620 (0.9% behind).