GPU Comparison

# NVIDIA B300 SXM6 AC vs NVIDIA L20

The NVIDIA B300 SXM6 AC is decisively faster than the NVIDIA L20 in raw compute performance, with the only shared benchmark showing a 34.8% advantage for the B300 SXM6 AC. The B300 SXM6 AC achieves a Geekbench OpenCL score of 369,831 against the L20's 274,276, placing it in the 100th percentile of all GPUs, while the L20 sits at the 99th percentile. This is not a close contest, the B300 SXM6 AC is built for maximum compute density, while the L20 is a more modest server accelerator with a different set of strengths.

Head-to-Head Benchmarks

The single direct comparison available, Geekbench OpenCL, shows the B300 SXM6 AC scoring 369,831 versus the L20's 274,276, a delta of 34.8%. That is the entire head-to-head dataset, but it is telling. The B300 SXM6 AC's score is also 7% above the NVIDIA B200's average of 345,482, and 10.4% above the H200 NVL's 334,891, meaning it leads not just the L20 but the entire nearest-rival field in its own tier. The L20, by contrast, sits below the NVIDIA L40 (284,111) and RTX 6000 Ada Generation (287,237) in its own nearest-rival list, with deltas of -11.6% and -12.6% respectively.

The magnitude of the B300 SXM6 AC's win is substantial. A 34.8% lead over the L20 in OpenCL translates into a clear compute advantage for workloads that scale with raw throughput. The B300 SXM6 AC also carries an average benchmark score of 369,831 across all tests, while the L20 averages 251,147, a gap of roughly 47% when comparing the two averages, though that figure mixes different test sets. The L20 does have a Geekbench Vulkan score of 228,018, which the B300 SXM6 AC lacks entirely, so the B300 SXM6 AC's advantage is measured only in OpenCL.

For the L20, the head-to-head result is not flattering, but it is also not the full story. The L20's nearest rivals include the PG506-232 at 225,124 (11.6% lower) and the Radeon PRO W7900D at 219,827 (14.2% lower), so the L20 is competitive within its own segment. It is simply outclassed by the B300 SXM6 AC, which belongs to a different performance class altogether.

Where Each One Wins

The B300 SXM6 AC wins on every metric where both are measured. Its FP32 throughput of 76.99 TFLOPS exceeds the L20's 59.35 TFLOPS, and its FP16 is also 76.99 TFLOPS (1:1) versus the L20's 59.35 TFLOPS (1:1). Texture rate is 1,202.9 GTexel/s for the B300 SXM6 AC versus 927.4 GTexel/s for the L20. Memory bandwidth is 8.19 TB/s against 864.0 GB/s, a factor of nearly 9.5 in favor of the B300 SXM6 AC. Memory capacity is 288 GB versus 48 GB. The B300 SXM6 AC has 18,944 shading units, 592 TMUs, and 592 tensor cores, while the L20 has 11,776 shading units, 368 TMUs, and 368 tensor cores.

The L20's wins are narrower but real. It has a higher boost clock at 2520 MHz versus 2032 MHz, and its pixel rate of 322.6 GPixel/s dwarfs the B300 SXM6 AC's 48.77 GPixel/s. The L20 also has 128 ROPs versus just 24, and it includes 92 RT cores, while the B300 SXM6 AC lists none. The L20 has display outputs (4x DisplayPort 1.4a), while the B300 SXM6 AC has no outputs. The L20 supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4; the B300 SXM6 AC lists N/A for all three. For rendering or rasterization-heavy tasks, the L20's pixel throughput and API support give it an edge the B300 SXM6 AC cannot match.

FAQ

Q: Which GPU is faster in Geekbench OpenCL?

A: The NVIDIA B300 SXM6 AC scores 369,831, which is 34.8% higher than the L20's 274,276.

Q: How does the B300 SXM6 AC compare to other high-end server GPUs?

A: It leads the NVIDIA B200 by 7% (369,831 vs 345,482), the H200 NVL by 10.4% (369,831 vs 334,891), and the AMD Instinct MI300X by 16.3% (369,831 vs 317,994).

Q: Does the L20 have any advantage in graphics or display capabilities?

A: Yes. The L20 has 4x DisplayPort 1.4a outputs and supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The B300 SXM6 AC has no display outputs and lists N/A for all three APIs.

Q: What is the memory configuration difference?

A: The B300 SXM6 AC has 288 GB of HBM3e on an 8192-bit bus with 8.19 TB/s bandwidth. The L20 has 48 GB of GDDR6 on a 384-bit bus with 864.0 GB/s bandwidth.

Q: Which GPU has higher pixel throughput?

A: The L20 has a pixel rate of 322.6 GPixel/s, while the B300 SXM6 AC is at 48.77 GPixel/s. The L20 also has 128 ROPs versus 24.

Q: How do the average benchmark scores compare?

A: The B300 SXM6 AC averages 369,831 across its benchmark set, placing it in the 100th percentile. The L20 averages 251,147, placing it in the 99th percentile.

Specification Differences

The two GPUs diverge sharply on nearly every specification. The B300 SXM6 AC uses 208,000 million transistors on a 1628 mm² die, while the L20 uses 76,300 million on a 609 mm² die. Transistor density is similar, 127.8M / mm² versus 125.3M / mm², but the sheer scale is different. The B300 SXM6 AC has a base clock of 1665 MHz and boost of 2032 MHz; the L20 has a lower base of 1440 MHz but a higher boost of 2520 MHz. Memory clocks are 2000 MHz (8 Gbps effective) for the B300 SXM6 AC versus 2250 MHz (18 Gbps effective) for the L20.

Shading units: 18,944 versus 11,776. TMUs: 592 versus 368. ROPs: 24 versus 128. Tensor cores: 592 versus 368. RT cores: the B300 SXM6 AC lists none, the L20 has 92. The B300 SXM6 AC's FP32 is 76.99 TFLOPS; the L20's is 59.35 TFLOPS. Both have FP16 at 1:1 ratio with identical TFLOPS as FP32. TDP is 1100 W for the B300 SXM6 AC versus 275 W for the L20. The B300 SXM6 AC is an SXM module; the L20 is dual-slot with a 16-pin connector. Suggested PSU is 1500 W versus 600 W. Bus interface is PCIe 6.0 x16 for the B300 SXM6 AC and PCIe 4.0 x16 for the L20. The L20 measures 267 mm in length and 111 mm in height; the B300 SXM6 AC has no listed dimensions.

Architecture Differences

The B300 SXM6 AC is built on the Blackwell Ultra architecture with the GB110 chip, belonging to the Server Blackwell (Bxx) generation. The L20 uses the Ada Lovelace architecture with the AD102 chip, in the Server Ada (Lxx) generation. Both are manufactured by TSMC on a 5 nm process, but the B300 SXM6 AC is far larger, 1628 mm² versus 609 mm². The B300 SXM6 AC uses HBM3e memory with an 8192-bit bus, while the L20 uses GDDR6 with a 384-bit bus. The B300 SXM6 AC has no RT cores listed and no display outputs; the L20 has 92 RT cores and 4x DisplayPort 1.4a. The B300 SXM6 AC supports PCIe 6.0 x16; the L20 supports PCIe 4.0 x16. The B300 SXM6 AC's predecessor is Server Hopper and successor is Server Rubin; the L20's predecessor is Server Ampere and successor is Server Hopper. Release dates are September 10, 2025 for the B300 SXM6 AC and November 15, 2023 for the L20. Both are active in production.

The Verdict

The NVIDIA B300 SXM6 AC is the clear choice for compute-bound workloads. It leads the L20 by 34.8% in OpenCL, holds the 100th percentile ranking, and outperforms every nearest rival including the B200, H200 NVL, and MI300X. Its 288 GB of HBM3e memory with 8.19 TB/s bandwidth is unmatched, and its FP32/FP16 throughput of 76.99 TFLOPS is roughly 30% above the L20's 59.35 TFLOPS. If the task is large-scale AI training, scientific simulation, or any workload that saturates memory bandwidth and tensor cores, the B300 SXM6 AC is the data-backed winner.

The NVIDIA L20 is the pick for different reasons. Its 322.6 GPixel/s pixel rate, 128 ROPs, and 92 RT cores make it suitable for rendering and graphics tasks, and its support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 means it can handle a broader range of graphics APIs. It also has display outputs, which the B300 SXM6 AC lacks entirely. The L20's 275 W TDP and 600 W suggested PSU make it a far lighter power load, and its dual-slot form factor fits standard server chassis with a 16-pin connector. For a workstation or server that needs graphics output, API compatibility, and rasterization performance, the L20 is the appropriate choice.

The data does not support any middle ground. The B300 SXM6 AC wins the only shared benchmark decisively, and its specifications align with that result. The L20 wins where the two are not directly compared, graphics, display, and API support. Choose the B300 SXM6 AC for compute density and memory capacity; choose the L20 for rendering, graphics, and flexibility.