NVIDIA H20 vs NVIDIA L20 Comparison

Head-to-Head Benchmarks

The NVIDIA H20 and NVIDIA L20 are both active server accelerators from NVIDIA, but they target distinctly different roles within a data center. The recorded data shows no direct head-to-head benchmark suite linking the two, so the comparison relies on the L20’s available benchmark scores and the H20’s specification profile. The H20 does not have benchmark scores in the database, making a direct score-based comparison impossible.

The L20 delivers a Geekbench OpenCL score of 274,276 and a Geekbench Vulkan score of 228,018, with an average benchmark score of 251,147. This places it in the 99th percentile of all GPUs, which is a very strong showing. Its nearest rivals in the database include the NVIDIA PG506-232 with an average score of 225,124 (11.6% lower), the AMD Radeon PRO W7900D with 219,827 (14.2% lower), the NVIDIA L40 with 284,111 (11.6% higher), and the NVIDIA RTX 6000 Ada Generation with 287,237 (12.6% higher). The L20 sits comfortably above the PG506-232 and the AMD part, but trails the L40 and RTX 6000 Ada by more than a tenth.

The H20, by contrast, has no recorded benchmark entries and a 50th percentile ranking among all GPUs, with an average benchmark score of zero. That percentile is not a performance verdict; it reflects the absence of measured data for this part. The H20’s strengths are visible in its silicon specifications. It uses the GH100 chip on the Hopper architecture, fabricated by TSMC on a 5 nm process, with 80,000 million transistors on a 814 mm² die. The L20 uses the AD102 chip on the Ada Lovelace architecture, also on TSMC 5 nm, with 76,300 million transistors on a 609 mm² die. The H20 has a larger die and more transistors, but the L20 has a higher transistor density at 125.3M per mm² versus 98.3M per mm² for the H20.

Clock speeds differ substantially. The H20 runs at a base clock of 1830 MHz and a boost clock of 1980 MHz, while the L20 has a lower base of 1440 MHz but a much higher boost of 2520 MHz. Memory configurations are fundamentally different. The H20 uses 96 GB of HBM3 on a 6144-bit bus, delivering 4.03 TB/s of bandwidth. The L20 uses 48 GB of GDDR6 on a 384-bit bus, with 864.0 GB/s of bandwidth. The H20 has more than four times the memory bandwidth and double the capacity.

Compute throughput favors the L20 in raw FP32. The L20 delivers 59.35 TFLOPS FP32, while the H20 delivers 39.54 TFLOPS. In FP16, the H20 offers 79.07 TFLOPS with a 2:1 ratio, while the L20 offers 59.35 TFLOPS with a 1:1 ratio. Pixel and texture rates also favor the L20. The L20 reaches 322.6 GPixel/s and 927.4 GTexel/s, compared to the H20’s 47.52 GPixel/s and 617.8 GTexel/s. The L20 has 11,776 shading units, 368 TMUs, and 128 ROPs, while the H20 has 9,984 shading units, 312 TMUs, and only 24 ROPs. The L20 also includes 92 RT cores and 368 tensor cores, versus 312 tensor cores for the H20.

Power and form factor are also distinct. The H20 is an SXM module with a 500 W TDP and a suggested PSU of 900 W. The L20 is a dual-slot card with a 275 W TDP, a single 16-pin power connector, and a suggested PSU of 600 W. The L20 has display outputs (4x DisplayPort 1.4a), while the H20 has no display outputs. The L20 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the H20 lists no graphics API support. The H20 uses PCIe 5.0 x16, while the L20 uses PCIe 4.0 x16.

The Verdict

The data indicates two different deployment profiles. The L20 is a fully featured, high-frequency workstation-class card with strong FP32 compute, graphics API support, and display outputs. Its benchmark scores place it in the 99th percentile, and it beats the PG506-232 and the AMD Radeon PRO W7900D by 11.6% and 14.2% respectively. It trails the L40 and RTX 6000 Ada, but those are larger, more expensive-class accelerators.

The H20 is a compute-focused SXM module with no display outputs and no graphics API support. It has double the memory capacity of the L20 and more than four times the memory bandwidth. Its FP16 throughput is higher than the L20’s, but its FP32 is lower. The H20’s 50th percentile ranking and zero average benchmark score mean the database has no measured performance data for it, so any comparison based on benchmarks is not possible. The H20 is not slower by evidence; it is simply unmeasured.

Strictly from the data, the L20 is the part for workloads that rely on FP32 compute, rasterization, ray tracing, or graphics output. Its 99th percentile ranking and benchmark scores confirm it is a high-performance card. The H20 is the part for memory-bound or FP16-heavy workloads that need large capacity and extreme bandwidth, but the database provides no score to quantify its performance. Users who need a benchmark-verified accelerator should choose the L20. Users who require 96 GB of HBM3 with 4.03 TB/s bandwidth should choose the H20, accepting that its performance is unverified.

Architecture Differences

The H20 and L20 come from different NVIDIA architectures. The H20 is based on the Hopper architecture with the GH100 chip, classified in the Server Hopper generation. The L20 is based on the Ada Lovelace architecture with the AD102 chip, classified in the Server Ada generation. The H20’s predecessor is listed as Server Ada and its successor is Server Blackwell. The L20’s predecessor is Server Ampere and its successor is Server Hopper, meaning the L20 sits one generation before the H20 in NVIDIA’s server lineup.

Both chips are fabricated by TSMC on a 5 nm process, but the H20’s die is larger at 814 mm² versus 609 mm² for the L20. The H20 packs 80,000 million transistors, while the L20 has 76,300 million. The L20 has a higher transistor density at 125.3M per mm², versus 98.3M per mm² for the H20. The H20’s larger die and higher transistor count align with its HBM3 memory controller, which spans a 6144-bit bus. The L20 uses a 384-bit GDDR6 interface.

Memory type and capacity are major architectural separators. The H20 uses HBM3 with 96 GB capacity and 4.03 TB/s bandwidth. The L20 uses GDDR6 with 48 GB capacity and 864.0 GB/s bandwidth. The H20’s memory bandwidth is 4.67 times higher. Clock behavior also differs. The H20 has a higher base clock (1830 MHz) and a lower boost clock (1980 MHz). The L20 has a lower base (1440 MHz) and a higher boost (2520 MHz), indicating a design that relies on dynamic boosting.

Shader and fixed-function hardware differ. The L20 has 11,776 shading units, 368 TMUs, 128 ROPs, 92 RT cores, and 368 tensor cores. The H20 has 9,984 shading units, 312 TMUs, 24 ROPs, and 312 tensor cores, with no RT core count listed. The L20’s ROP count is more than five times the H20’s, which explains the large gap in pixel rate (322.6 GPixel/s vs 47.52 GPixel/s). Texture rate is also higher on the L20 (927.4 GTexel/s vs 617.8 GTexel/s).

Compute ratios are distinct. The H20’s FP16 is 79.07 TFLOPS with a 2:1 ratio relative to FP32, meaning it doubles FP16 throughput. The L20’s FP16 is 59.35 TFLOPS with a 1:1 ratio, meaning it does not accelerate FP16 beyond FP32. This makes the H20 more suited to mixed-precision workloads. The L20’s FP32 of 59.35 TFLOPS is 50% higher than the H20’s 39.54 TFLOPS.

The H20 is an SXM module, which typically requires a server chassis with a baseboard. The L20 is a dual-slot card with a 267 mm length and 111 mm height, using a single 16-pin power connector. The H20 has a 500 W TDP and a suggested PSU of 900 W. The L20 has a 275 W TDP and a suggested PSU of 600 W. The L20 supports PCIe 4.0 x16, while the H20 supports PCIe 5.0 x16, giving the H20 double the interface bandwidth. The L20 supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the H20 lists none of these. The L20 also has four DisplayPort 1.4a outputs, which the H20 lacks entirely.

FAQ

Q: Which GPU has a higher benchmark score, the H20 or the L20?

A: The L20 has measured benchmark scores: 274,276 in Geekbench OpenCL, 228,018 in Geekbench Vulkan, and an average of 251,147. The H20 has no recorded benchmark scores in the database.

Q: How does the L20 compare to its nearest rivals?

A: The L20 is 11.6% above the NVIDIA PG506-232 and 14.2% above the AMD Radeon PRO W7900D. It is 11.6% below the NVIDIA L40 and 12.6% below the NVIDIA RTX 6000 Ada Generation.

Q: What is the memory capacity difference?

A: The H20 has 96 GB of HBM3, while the L20 has 48 GB of GDDR6. The H20 has double the capacity.

Q: Which card has higher memory bandwidth?

A: The H20 has 4.03 TB/s of bandwidth, while the L20 has 864.0 GB/s. The H20 has more than four times the bandwidth.

Q: Which card supports display outputs?

A: The L20 has 4x DisplayPort 1.4a outputs. The H20 has no display outputs.

Q: What is the power consumption difference?

A: The H20 has a 500 W TDP and a suggested PSU of 900 W. The L20 has a 275 W TDP and a suggested PSU of 600 W.

Where Each One Wins

The L20 wins in raw FP32 compute, delivering 59.35 TFLOPS versus the H20’s 39.54 TFLOPS. It also wins in pixel rate (322.6 GPixel/s vs 47.52 GPixel/s) and texture rate (927.4 GTexel/s vs 617.8 GTexel/s). The L20 has more shading units, TMUs, and ROPs, and it adds 92 RT cores that the H20 does not list. It is the only one of the two with graphics API support (DirectX 12 Ultimate, OpenGL 4.6, Vulkan 1.4) and display outputs (4x DisplayPort 1.4a). Its benchmark average of 251,147 and 99th percentile ranking confirm strong measured performance. It uses less power (275 W vs 500 W) and has a lower suggested PSU (600 W vs 900 W). It is a dual-slot card with a physical length of 267 mm, making it suitable for standard server or workstation slots.

The H20 wins in memory capacity and bandwidth. It has 96 GB of HBM3 versus 48 GB of GDDR6, and 4.03 TB/s versus 864.0 GB/s. This gives it a decisive advantage for workloads that are memory-capacity-bound or bandwidth-bound, such as large model inference or data-parallel FP16 workloads. The H20 also has higher FP16 throughput at 79.07 TFLOPS versus 59.35 TFLOPS, and it uses a 2:1 FP16 ratio, meaning it can double its FP32 rate when operating in FP16. The H20 has a higher base clock (1830 MHz vs 1440 MHz), a larger die (814 mm² vs 609 mm²), and more transistors (80,000 million vs 76,300 million). It uses PCIe 5.0 x16, which is double the interface bandwidth of the L20’s PCIe 4.0 x16. It is an SXM module, which is the standard form factor for dense server deployments.

The choice between them is clear from the data. The L20 is the measured performance leader with verified benchmark scores, high FP32 throughput, graphics capabilities, and lower power. The H20 is the memory leader with double the capacity and more than four times the bandwidth, plus higher FP16 throughput and a newer PCIe interface, but its performance is unverified in the database.