NVIDIA GB10 vs NVIDIA L20 Comparison

FAQ

Q: Which GPU shows a higher average benchmark score in the database, the NVIDIA L20 or the NVIDIA GB10?

A: The NVIDIA L20, with an average benchmark score of 251147, compared to the NVIDIA GB10's 117393, a difference of more than double.

Q: What do the Geekbench OpenCL scores reveal about the performance gap?

A: The L20 scores 274276 in Geekbench OpenCL, while the GB10 scores 120137. The delta percentage is 128.3%, meaning the L20 performs 128.3% better in this specific test.

Q: In which graphics API test does the L20's lead narrow the most, and by how much?

A: The lead narrows in Geekbench Vulkan. The L20 scores 228018 versus the GB10's 114648, for a delta percentage of 98.9%. While still a dominant lead, it is smaller than the 128.3% margin seen in OpenCL.

Q: How does the GB10's average score compare to its closest rival in the database?

A: The GB10 has an average score of 117393, which is just 0.3% higher than the NVIDIA RTX 4000 SFF Ada Generation's score of 117088, making them extremely close in overall performance.

Q: Where does the L20 rank among all GPUs in the database, and who is its immediate performance rival?

A: The L20 sits in the 99th percentile of all GPUs. Its nearest rival is the NVIDIA L40, which scores 284111, a figure that is 11.6% higher than the L20's average.

Q: What is the difference in memory capacity between the two cards?

A: The NVIDIA L20 features 48 GB of GDDR6 memory, while the NVIDIA GB10 features 128 GB of LPDDR5X memory, making the GB10 the card with significantly more memory capacity.

Architecture Differences

The NVIDIA L20 and NVIDIA GB10 represent two distinct architectural approaches from the same manufacturer. The L20 is built on the Ada Lovelace architecture, specifically using the AD102 chip, and belongs to the Server Ada (Lxx) generation. In contrast, the GB10 uses the newer Blackwell 2.0 architecture with the GB20B chip, placing it in the Server Blackwell (Bxx) generation. This generational difference is not just a naming convention; it signifies a shift in design priorities and technological focus.

Manufacturing processes are identical for both GPUs at 5 nm at TSMC. However, the physical design diverges sharply. The L20's AD102 chip is a large, complex die measuring 609 mm² and containing 76,300 million transistors, resulting in a transistor density of 125.3M per mm². The GB10's die size is considerably smaller at 382 mm², and its transistor count is listed as unknown in the database. This size disparity suggests a fundamentally different approach to chip design, with the L20 focusing on raw compute capability and the GB10 on a more integrated, efficient package.

The rendering pipelines highlight major differences in core composition. The L20 is equipped with 11,776 shading units, 368 TMUs, and 128 ROPs. The GB10, while having fewer shading units at 6,144, actually has more TMUs at 384, but significantly fewer ROPs at 48. This configuration suggests the L20 is built for high-fill-rate tasks, while the GB10's design might favor different workload types. Ray tracing and tensor core counts also differ, with the L20 having 92 RT cores and 368 Tensor Cores, while the GB10 has 48 RT cores and 384 Tensor Cores. The GB10's higher TMU and Tensor Core count relative to its shading units indicates a specialized focus on texture and matrix operations.

Clock speeds show another divergence. The GB10 has a higher base clock at 1665 MHz compared to the L20's 1440 MHz. However, the L20 has a higher boost clock at 2520 MHz versus the GB10's 2418 MHz. This suggests the L20 can push higher peak performance when power and thermal headroom allow, while the GB10 maintains a higher baseline pace.

Memory architecture is a stark point of differentiation. The L20 uses a 384-bit bus with 48 GB of GDDR6, delivering a massive 864.0 GB/s of bandwidth. The GB10, on the other hand, uses a 256-bit bus with 128 GB of LPDDR5X, but its bandwidth is only 273.2 GB/s. The L20's focus on bandwidth is clear, while the GB10 prioritizes capacity and power efficiency.

Finally, the platform integration differs. The L20 is a dual-slot, discrete card requiring a 16-pin power connector and a 600 W suggested PSU. The GB10 is an IGP (Integrated Graphics Processor) with no power connectors and a 300 W suggested PSU. The L20 supports a full suite of APIs including DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the GB10 lists N/A for all these APIs, indicating a different software ecosystem or intended use case.

The Verdict

Based on the recorded data, the choice between the NVIDIA L20 and NVIDIA GB10 is a clear one for raw compute performance. The L20 is the definitive winner in every benchmark. Its Geekbench OpenCL score of 274276 is 128.3% higher than the GB10's 120137. In Vulkan, the L20's 228018 is 98.9% higher than the GB10's 114648. For any workload where raw graphics or compute throughput is the primary metric, the L20 is the superior card. Its 99th percentile ranking versus the GB10's 95th percentile further solidifies this position.

However, the data also paints a picture of two different use cases. The GB10, with its 128 GB of memory, 140 W TDP, and IGP form factor, is not designed to compete on raw speed. It is a high-capacity, low-power solution. Its average score of 117393 places it in the same performance class as the NVIDIA RTX 4000 SFF Ada Generation, which scores 117088, a mere 0.3% difference. This suggests the GB10 is positioned for environments where power constraints and memory capacity are more critical than peak FLOPS.

The L20, with its 48 GB of memory and 864.0 GB/s of bandwidth, is built for bandwidth-intensive compute tasks. Its nearest rival in the database is the NVIDIA L40, which is 11.6% faster, and the NVIDIA RTX 6000 Ada Generation, which is 12.6% faster. This places the L20 in a high-performance tier. Users requiring maximum compute throughput for simulations, rendering, or AI inference should select the L20. Users who need to handle very large datasets within a strict power envelope and can accept lower throughput should consider the GB10, despite its significant performance deficit.

Specification Differences

The two cards differ across nearly every major specification category.

• Architecture: L20 uses Ada Lovelace, GB10 uses Blackwell 2.0.
• Chip: L20 uses AD102, GB10 uses GB20B.
• Generation: L20 is from Server Ada (Lxx), GB10 is from Server Blackwell (Bxx).
• Die Size: L20 is 609 mm², GB10 is 382 mm².
• Transistor Density: L20 has 125.3M / mm², GB10 has no recorded value.
• Base Clock: L20 runs at 1440 MHz, GB10 runs at 1665 MHz.
• Boost Clock: L20 boosts to 2520 MHz, GB10 boosts to 2418 MHz.
• Memory Size: L20 has 48 GB, GB10 has 128 GB.
• Memory Type: L20 uses GDDR6, GB10 uses LPDDR5X.
• Memory Bus Width: L20 has a 384 bit bus, GB10 has a 256 bit bus.
• Memory Bandwidth: L20 delivers 864.0 GB/s, GB10 delivers 273.2 GB/s.
• Shading Units: L20 has 11,776, GB10 has 6,144.
• ROPs: L20 has 128, GB10 has 48.
• RT Cores: L20 has 92, GB10 has 48.
• Tensor Cores: L20 has 368, GB10 has 384.
• Pixel Rate: L20 is 322.6 GPixel/s, GB10 is 116.1 GPixel/s.
• Texture Rate: L20 is 927.4 GTexel/s, GB10 is 928.5 GTexel/s.
• FP32 Performance: L20 is 59.35 TFLOPS, GB10 is 29.71 TFLOPS.
• FP16 Performance: L20 is 59.35 TFLOPS (1:1), GB10 is 29.71 TFLOPS (1:1).
• TDP: L20 is 275 W, GB10 is 140 W.
• Slot Width: L20 is Dual-slot, GB10 is IGP.
• Power Connectors: L20 has 1x 16-pin, GB10 has None.
• Suggested PSU: L20 is 600 W, GB10 is 300 W.
• Bus Interface: L20 is PCIe 4.0 x16, GB10 is PCIe 5.0 x16.
• Display Outputs: L20 has 4x DisplayPort 1.4a, GB10 has 1x HDMI.
• API Support: L20 supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, GB10 lists N/A for all.
• Dimensions: L20 is 267 mm long and 111 mm high, GB10 is 150 mm long, 51 mm high, and 150 mm wide.
• Release Date: L20 released in November 2023, GB10 released in October 2025.

Head-to-Head Benchmarks

The database contains two direct comparison benchmarks between these GPUs, and the NVIDIA L20 wins both decisively.

In the Geekbench OpenCL test, the L20 scores 274276 points. The GB10 manages a score of 120137 points. This results in a delta percentage of 128.3%, meaning the L20 is more than twice as fast in this compute-oriented API test. This is the largest performance gap recorded between the two cards.

The second benchmark, Geekbench Vulkan, shows a similar but slightly less extreme outcome. The L20 scores 228018 points, while the GB10 scores 114648 points. The delta percentage here is 98.9%. While the L20's lead is nearly double, it is proportionally smaller than the OpenCL margin. This indicates that the L20's advantage is consistent across different graphics and compute APIs, though the specific workload characteristics of Vulkan may slightly favor the GB10's architecture compared to OpenCL.

These results show a clear and substantial performance hierarchy. The L20's average benchmark score of 251147, which combines these two tests, dwarfs the GB10's average of 117393. The L20 also holds a 99th percentile ranking among all GPUs in the database, while the GB10 sits at the 95th percentile. The data confirms that for general compute and graphics workloads, the L20 is the far more powerful processor.

Where Each One Wins

NVIDIA L20 Wins: Raw Compute and Graphics Throughput

The L20 is the clear victor in all measured performance benchmarks. Its 128.3% lead in OpenCL and 98.9% lead in Vulkan make it the superior choice for any application that directly translates to these scores. The L20's FP32 performance of 59.35 TFLOPS is exactly double the GB10's 29.71 TFLOPS, highlighting its dominance in single-precision compute tasks. Its pixel rate of 322.6 GPixel/s versus the GB10's 116.1 GPixel/s shows a significant advantage in fill-rate-bound rendering. The L20's 864.0 GB/s of memory bandwidth is over three times the GB10's 273.2 GB/s, making it far more capable for data-intensive workloads. This card wins for high-performance computing, professional rendering, and any task where speed is the primary requirement.

NVIDIA GB10 Wins: Memory Capacity and Power Efficiency

The GB10's advantages are not in raw speed but in capacity and integration. It offers 128 GB of memory, which is 80 GB more than the L20's 48 GB, making it the better option for workloads that require loading very large datasets into memory at once. Its 140 W TDP is nearly half the L20's 275 W, and it requires no external power connectors, operating as an IGP with a suggested PSU of 300 W. This makes it suitable for compact, power-constrained systems. The GB10 also has a higher base clock (1665 MHz vs 1440 MHz) and more Tensor Cores (384 vs 368), suggesting a potential edge in certain sustained, low-power matrix operations. Its texture rate of 928.5 GTexel/s is also marginally higher than the L20's 927.4 GTexel/s, a negligible but notable tie-breaker. The GB10 wins for applications where memory size, low power draw, and a small physical footprint are more critical than peak speed.