NVIDIA H20 NVL16 vs NVIDIA N1 20SM Comparison

FAQ

Q: What are the core architectural differences between the NVIDIA H20 NVL16 and the NVIDIA N1 20SM?

A: The H20 NVL16 is built on the Hopper architecture using the GH100 chip, fabricated on a 5 nm process at TSMC with 80,000 million transistors. The N1 20SM uses the Blackwell 2.0 architecture with the GB20B chip, also on a 5 nm TSMC process, but its transistor count is unknown. The H20 NVL16 has a die size of 814 mm², while the N1 20SM has a die size of 382 mm².

Q: How do the memory subsystems compare between these two GPUs?

A: The H20 NVL16 features 96 GB of HBM3 memory on a 6144-bit bus, delivering 4.03 TB/s of bandwidth. The N1 20SM has 128 GB of LPDDR5X memory on a 256-bit bus, providing 273.2 GB/s of bandwidth. The H20 NVL16 has significantly higher memory bandwidth, while the N1 20SM has a larger memory capacity.

Q: What are the clock speed differences between the two products?

A: The H20 NVL16 has a base clock of 1830 MHz and a boost clock of 1980 MHz, with memory running at 1313 MHz (5.3 Gbps effective). The N1 20SM has a base clock of 741 MHz and a boost clock of 2346 MHz, with memory at 1067 MHz (8.5 Gbps effective). The N1 20SM has a higher boost clock, while the H20 NVL16 has a much higher base clock.

Q: How do the compute capabilities differ in terms of FP32 and FP16 performance?

A: The H20 NVL16 delivers 39.54 TFLOPS of FP32 performance and 79.07 TFLOPS of FP16 performance (2:1 ratio). The N1 20SM provides 12.01 TFLOPS of FP32 and 12.01 TFLOPS of FP16 (1:1 ratio). The H20 NVL16 is roughly 3.3 times faster in FP32 and about 6.6 times faster in FP16.

Q: What are the physical form factor and interface differences?

A: The H20 NVL16 is an SXM Module with a 400 W TDP and a suggested PSU of 800 W, using a PCIe 5.0 x16 interface. The N1 20SM is an IGP (integrated graphics processor) with no power connectors, also using a PCIe 5.0 x16 interface. The N1 20SM has one HDMI display output, while the H20 NVL16 has no display outputs.

Q: What are the release dates and production status for both products?

A: The H20 NVL16 was released on September 1, 2025, and is currently Active in production. The N1 20SM was released on May 31, 2026, and is also Active in production.

Architecture Differences

The H20 NVL16 and N1 20SM represent two distinct architectural approaches within NVIDIA's server and integrated product lines. The H20 NVL16 is built on the Hopper architecture with the GH100 chip, belonging to the Server Hopper (Hxx) generation. The N1 20SM uses the Blackwell 2.0 architecture with the GB20B chip, classified under the Blackwell IGP (N1x) generation.

The compute resources differ substantially. The H20 NVL16 contains 9984 shading units, 312 texture mapping units, and 24 raster output pipelines. It also includes 312 tensor cores. The N1 20SM has 2560 shading units, 160 TMUs, and 24 ROPs, along with 20 ray tracing cores and 80 tensor cores. The H20 NVL16 has no dedicated RT cores listed, while the N1 20SM includes them.

Both chips are fabricated on a 5 nm process at TSMC, but the transistor counts diverge. The H20 NVL16 packs 80,000 million transistors into an 814 mm² die, resulting in a transistor density of 98.3M per mm². The N1 20SM's transistor count is unknown, but its die size is 382 mm², roughly 47% of the H20 NVL16's area.

Memory architecture represents a fundamental split. The H20 NVL16 uses 96 GB of HBM3 memory across a 6144-bit bus, achieving 4.03 TB/s bandwidth. The N1 20SM employs 128 GB of LPDDR5X on a 256-bit bus with 273.2 GB/s bandwidth. This means the H20 NVL16 has roughly 14.7 times the memory bandwidth of the N1 20SM, while the N1 20SM has 32 GB more capacity.

The clock behavior also differs. The H20 NVL16 operates at a base clock of 1830 MHz with a boost to 1980 MHz, while the N1 20SM starts at 741 MHz and boosts to 2346 MHz. The H20 NVL16's base clock is 1089 MHz higher, but the N1 20SM's boost clock exceeds the H20 NVL16's by 366 MHz.

Power and physical characteristics separate the two further. The H20 NVL16 is an SXM Module with a 400 W TDP and requires a suggested PSU of 800 W. The N1 20SM is an IGP with no power connectors and an unknown TDP. The H20 NVL16 has no display outputs, while the N1 20SM provides a single HDMI output.

The H20 NVL16's predecessor is Server Ada, and its successor is Server Blackwell. The N1 20SM lists no predecessor or successor in the database. Both products use PCIe 5.0 x16 as their bus interface.

The Verdict

The data indicates a clear performance hierarchy between these two GPUs. The H20 NVL16 is the compute-focused solution, with substantially higher FP32 and FP16 throughput, significantly greater memory bandwidth, and a much larger transistor budget. The N1 20SM is the integrated solution, offering a larger memory pool, a higher boost clock, and display output capability.

For compute-heavy server workloads that depend on raw floating-point throughput and massive memory bandwidth, the H20 NVL16 is the appropriate choice. Its FP32 performance of 39.54 TFLOPS and FP16 performance of 79.07 TFLOPS dwarf the N1 20SM's 12.01 TFLOPS in both categories. The 4.03 TB/s memory bandwidth also provides a decisive advantage for memory-bound operations.

For applications requiring a larger memory footprint, the N1 20SM's 128 GB capacity exceeds the H20 NVL16's 96 GB. The N1 20SM also offers integrated graphics functionality with a display output, which the H20 NVL16 lacks entirely. The N1 20SM's higher boost clock of 2346 MHz suggests it can reach higher instantaneous clock speeds in certain conditions, though its base clock is much lower.

The H20 NVL16 was released earlier, on September 1, 2025, while the N1 20SM arrived later on May 31, 2026. Both are active products. The H20 NVL16 targets the server accelerator segment with its SXM Module form factor, while the N1 20SM is designed as an IGP solution.

Neither product has benchmark scores recorded in the database, and both sit at the 50th percentile against all GPUs. The head-to-head benchmark comparison is empty, so the analysis relies on the specification data alone.

Specification Differences

The two GPUs differ across nearly every specification category in the database.

Chip and Architecture: The H20 NVL16 uses the GH100 chip with Hopper architecture, while the N1 20SM uses the GB20B chip with Blackwell 2.0 architecture. The H20 NVL16 belongs to the Server Hopper (Hxx) generation, and the N1 20SM belongs to the Blackwell IGP (N1x) generation.

Process and Die: Both use 5 nm TSMC process. The H20 NVL16 has 80,000 million transistors, while the N1 20SM's transistor count is unknown. The die sizes are 814 mm² for the H20 NVL16 and 382 mm² for the N1 20SM. The H20 NVL16 has a transistor density of 98.3M per mm²; the N1 20SM's density is not recorded.

Clocks: The H20 NVL16 has a base clock of 1830 MHz and boost of 1980 MHz. The N1 20SM has a base clock of 741 MHz and boost of 2346 MHz. Memory clocks are 1313 MHz (5.3 Gbps effective) for the H20 NVL16 and 1067 MHz (8.5 Gbps effective) for the N1 20SM.

Memory: The H20 NVL16 has 96 GB HBM3 on a 6144-bit bus with 4.03 TB/s bandwidth. The N1 20SM has 128 GB LPDDR5X on a 256-bit bus with 273.2 GB/s bandwidth.

Compute Units: The H20 NVL16 has 9984 shading units, 312 TMUs, 24 ROPs, no listed RT cores, and 312 tensor cores. The N1 20SM has 2560 shading units, 160 TMUs, 24 ROPs, 20 RT cores, and 80 tensor cores.

Performance Rates: The H20 NVL16 delivers a pixel rate of 47.52 GPixel/s and texture rate of 617.8 GTexel/s. The N1 20SM provides a pixel rate of 56.30 GPixel/s and texture rate of 375.4 GTexel/s.

Power and Form Factor: The H20 NVL16 has a 400 W TDP, SXM Module slot width, and an 800 W suggested PSU. The N1 20SM has an unknown TDP, IGP slot width, and no power connectors or suggested PSU.

Outputs and Interface: The H20 NVL16 has no display outputs. The N1 20SM has 1x HDMI. Both use PCIe 5.0 x16.

APIs: Both list DirectX, OpenGL, and Vulkan as N/A.

Release and Status: The H20 NVL16 released on September 1, 2025, with predecessor Server Ada and successor Server Blackwell. The N1 20SM released on May 31, 2026, with no predecessor or successor. Both are Active.

Head-to-Head Benchmarks

The database contains no recorded head-to-head benchmark results for these two GPUs, and no individual benchmark scores exist for either product. The head-to-head benchmark array is empty, and both products show zero wins in the comparison. The average benchmark score for both is zero, and each sits at the 50th percentile against all GPUs.

Given the absence of benchmark data, the specification comparison provides the only quantitative basis for analysis. The FP32 performance gap is substantial: the H20 NVL16 outputs 39.54 TFLOPS versus the N1 20SM's 12.01 TFLOPS, a difference of 27.53 TFLOPS. In FP16, the H20 NVL16 delivers 79.07 TFLOPS compared to the N1 20SM's 12.01 TFLOPS, a gap of 67.06 TFLOPS.

Memory bandwidth shows the largest relative difference. The H20 NVL16's 4.03 TB/s is approximately 14.7 times the N1 20SM's 273.2 GB/s. The memory bus width difference is equally stark: 6144 bits versus 256 bits.

The texture rate favors the H20 NVL16 at 617.8 GTexel/s versus 375.4 GTexel/s for the N1 20SM, a difference of 242.4 GTexel/s. However, the pixel rate favors the N1 20SM, which achieves 56.30 GPixel/s against the H20 NVL16's 47.52 GPixel/s, a difference of 8.78 GPixel/s.

The N1 20SM has a higher boost clock by 366 MHz but a lower base clock by 1089 MHz. The N1 20SM also has 32 GB more memory capacity, though with far lower bandwidth.

Where Each One Wins

The H20 NVL16 wins decisively in raw compute throughput. Its FP32 performance is 3.3 times higher, and its FP16 performance is 6.6 times higher than the N1 20SM. This makes it the preferred option for workloads that depend heavily on floating-point arithmetic, such as large-scale matrix operations and high-precision simulation tasks.

The H20 NVL16 also dominates in memory bandwidth, with 4.03 TB/s compared to 273.2 GB/s. Applications that stream large datasets through the GPU, such as certain inference workloads or data-intensive processing, will benefit from this bandwidth advantage. The 6144-bit memory bus provides a wide path for data movement.

The texture rate of 617.8 GTexel/s for the H20 NVL16 exceeds the N1 20SM's 375.4 GTexel/s, giving it an advantage in texture-heavy rendering workloads. The H20 NVL16 also has 312 tensor cores versus 80 for the N1 20SM, suggesting greater tensor operation throughput.

The N1 20SM wins in memory capacity, offering 128 GB versus 96 GB. Workloads that require holding very large models or datasets in memory, rather than streaming them, may prefer the larger pool. The N1 20SM also has a higher pixel rate at 56.30 GPixel/s versus 47.52 GPixel/s, giving it an edge in fill-rate-bound scenarios.

The N1 20SM has a higher boost clock of 2346 MHz, which may allow it to reach higher instantaneous performance in burst workloads. It also includes 20 ray tracing cores, a feature not listed for the H20 NVL16, potentially making it more suitable for ray-traced rendering tasks.

The N1 20SM provides a display output via HDMI, while the H20 NVL16 has none, making the N1 20SM the only option for tasks requiring direct display connectivity. Its IGP form factor with no power connectors also makes it more adaptable to systems without dedicated GPU power delivery.