AMD Instinct MI325X vs NVIDIA H20 NVL16 Comparison

The Verdict

The database places both the AMD Instinct MI325X and the NVIDIA H20 NVL16 at the 50th percentile among all GPUs, with identical average benchmark scores of zero. This indicates that, within the recorded measurements, neither accelerator demonstrates a statistical edge over the other. The AMD part, built on CDNA 3.0 and using the Aqua Vanjaram chip, offers a substantially larger memory pool and higher raw throughput figures. The NVIDIA part, built on Hopper with the GH100 chip, counters with a much lower power envelope and a higher base clock.

For a workload that is memory-capacity bound, the AMD Instinct MI325X is the clear choice based on its 256 GB HBM3e allocation versus 96 GB HBM3 on the NVIDIA part. For a deployment constrained by power delivery or cooling within a chassis, the NVIDIA H20 NVL16 is the only defensible option, given its 400 W TDP against the AMD part’s 1000 W TDP. The data shows no benchmark wins for either side, so the selection must hinge entirely on architectural and specification differences rather than measured performance deltas.

Architecture Differences

The two accelerators diverge fundamentally at the chip level. AMD uses the Aqua Vanjaram die, fabricated on a 5 nm process at TSMC, containing 153,000 million transistors across a 1017 mm² die. This yields a transistor density of 150.4 million transistors per square millimeter. NVIDIA’s GH100 chip is also built on TSMC’s 5 nm node, but it integrates 80,000 million transistors on an 814 mm² die, resulting in a lower density of 98.3 million transistors per square millimeter. The AMD die is larger by 203 mm² and carries 73,000 million more transistors.

The memory subsystems are architecturally distinct. AMD deploys 256 GB of HBM3e across an 8192-bit bus, achieving 6.14 TB/s of bandwidth. NVIDIA deploys 96 GB of HBM3 across a 6144-bit bus, reaching 4.03 TB/s. The AMD memory clock is listed at 1500 MHz with 6 Gbps effective speed, while the NVIDIA memory clock is 1313 MHz with 5.3 Gbps effective speed. These differences mean the AMD part provides 2.67 times the capacity and roughly 1.52 times the bandwidth of the NVIDIA part.

Compute resources also differ sharply. AMD integrates 19,456 shading units, 1,216 texture mapping units, and zero ROPs. NVIDIA integrates 9,984 shading units, 312 TMUs, 24 ROPs, and 312 tensor cores. The AMD part has no tensor core count listed, while the NVIDIA part is explicitly equipped with tensor cores. The pixel rate for AMD is recorded as 0 MPixel/s, while NVIDIA achieves 47.52 GPixel/s. Texture rates are 2,553.6 GTexel/s for AMD versus 617.8 GTexel/s for NVIDIA.

The power delivery and physical form factor differ as well. AMD specifies a 1000 W TDP with a suggested PSU of 1400 W, packaged as an OAM Module with no power connectors listed. NVIDIA specifies a 400 W TDP with a suggested PSU of 800 W, packaged as an SXM Module. Both use PCIe 5.0 x16 as the bus interface, and neither provides display outputs. The API support is identical: DirectX, OpenGL, and Vulkan are all listed as N/A for both.

The production status also differs. The NVIDIA H20 NVL16 is marked as Active, with a release date of September 1, 2025, and a successor listed as Server Blackwell. The AMD Instinct MI325X has no production status listed, a release date of October 9, 2024, and a predecessor of Radeon Instinct. The NVIDIA part’s predecessor is Server Ada, and its successor is Server Blackwell.

Where Each One Wins

Without any recorded benchmark wins for either accelerator, the analysis must rely on specification advantages to identify where each part would dominate.

The AMD Instinct MI325X wins in memory capacity, memory bandwidth, shading unit count, TMU count, texture rate, and raw FP32 and FP16 throughput. Its 256 GB HBM3e pool is more than double the NVIDIA part’s memory, which suits large model residency, high-capacity inference batches, or datasets that must stay on-device. The 6.14 TB/s bandwidth is 52% higher than the NVIDIA part’s 4.03 TB/s, which reduces time spent waiting on memory transfers. The FP32 throughput of 81.72 TFLOPS is more than double the NVIDIA part’s 39.54 TFLOPS. The FP16 figure of 81.72 TFLOPS (1:1 ratio) slightly exceeds the NVIDIA part’s 79.07 TFLOPS (2:1 ratio), though the NVIDIA part achieves its FP16 number at half the precision rate ratio.

The NVIDIA H20 NVL16 wins in power efficiency, physical footprint, pixel rate, ROP count, and tensor core presence. Its 400 W TDP is 60% lower than the AMD part’s 1000 W TDP, which enables denser server configurations and simpler cooling. The suggested PSU of 800 W is 600 W lower than the AMD part’s 1400 W suggestion. The base clock of 1830 MHz is 830 MHz higher than the AMD part’s 1000 MHz base clock, and the boost clock of 1980 MHz is 120 MHz lower than the AMD part’s 2100 MHz boost. The NVIDIA part includes 24 ROPs and 312 tensor cores, both absent from the AMD specification list, which means the NVIDIA part can handle rasterization-style output and tensor-based operations directly, while the AMD part lists neither.

FAQ

Q: Which accelerator has more memory capacity?

A: The AMD Instinct MI325X has 256 GB of HBM3e, while the NVIDIA H20 NVL16 has 96 GB of HBM3. This is a 160 GB difference in favor of AMD.

Q: What is the power consumption difference?

A: The AMD Instinct MI325X has a TDP of 1000 W with a suggested PSU of 1400 W, while the NVIDIA H20 NVL16 has a TDP of 400 W with a suggested PSU of 800 W. The NVIDIA part consumes 600 W less and requires a 600 W smaller suggested PSU.

Q: Do either of these accelerators support display outputs?

A: No. Both the AMD Instinct MI325X and the NVIDIA H20 NVL16 list "No outputs" for display connections.

Q: What are the release dates for these two parts?

A: The AMD Instinct MI325X was released on October 9, 2024, while the NVIDIA H20 NVL16 was released on September 1, 2025.

Q: Which accelerator has tensor cores?

A: The NVIDIA H20 NVL16 lists 312 tensor cores. The AMD Instinct MI325X does not have a tensor core count listed in the database.

Q: How do the FP16 throughput figures compare?

A: The AMD Instinct MI325X achieves 81.72 TFLOPS FP16 with a 1:1 ratio, while the NVIDIA H20 NVL16 achieves 79.07 TFLOPS FP16 with a 2:1 ratio. The AMD part is 2.65 TFLOPS higher in raw FP16 throughput.

Head-to-Head Benchmarks

The database records zero head-to-head benchmark entries for this pair, and neither accelerator has any individual benchmark scores or wins. The average benchmark score for both is zero, and the percentile rank for both is 50. This absence of measured data means every comparison must draw from the specification fields alone.

The largest specification gap in favor of the AMD Instinct MI325X is memory capacity. At 256 GB versus 96 GB, the AMD part offers 2.67 times the memory of the NVIDIA part. The bandwidth gap is similarly wide: 6.14 TB/s versus 4.03 TB/s, a 2.11 TB/s difference. The shading unit count is 19,456 versus 9,984, a 9,472 unit lead for AMD. The TMU count is 1,216 versus 312, a 904 unit lead. The texture rate is 2,553.6 GTexel/s versus 617.8 GTexel/s, a 1,935.8 GTexel/s gap. The FP32 throughput is 81.72 TFLOPS versus 39.54 TFLOPS, a 42.18 TFLOPS lead.

The largest specification gap in favor of the NVIDIA H20 NVL16 is TDP. At 400 W versus 1000 W, the NVIDIA part consumes 600 W less. The suggested PSU is 800 W versus 1400 W, a 600 W difference. The base clock is 1830 MHz versus 1000 MHz, an 830 MHz lead for NVIDIA. The pixel rate is 47.52 GPixel/s versus 0 MPixel/s, a complete advantage for NVIDIA since the AMD part records no pixel output. The ROP count is 24 versus 0, and the tensor core count is 312 versus none listed. The die size is smaller for NVIDIA at 814 mm² versus 1017 mm², a 203 mm² difference, and the transistor count is lower at 80,000 million versus 153,000 million.

The boost clock favors AMD slightly: 2100 MHz versus 1980 MHz, a 120 MHz lead. The memory type differs (HBM3e versus HBM3), as does the memory bus width (8192 bit versus 6144 bit). The transistor density favors AMD at 150.4 million transistors per square millimeter versus 98.3 million. The FP16 comparison is close, with AMD ahead by 2.65 TFLOPS, but the ratio differs (1:1 versus 2:1), which indicates different precision handling approaches.

Specification Differences

The two accelerators differ across every major specification category. The manufacturing process is identical (5 nm TSMC), but the die size is 1017 mm² for AMD versus 814 mm² for NVIDIA. Transistor counts are 153,000 million versus 80,000 million, with densities of 150.4 million per mm² versus 98.3 million per mm².

Clock speeds differ significantly: AMD has a 1000 MHz base and 2100 MHz boost, while NVIDIA has an 1830 MHz base and 1980 MHz boost. Memory clocks are 1500 MHz (6 Gbps effective) for AMD versus 1313 MHz (5.3 Gbps effective) for NVIDIA. Memory capacity is 256 GB versus 96 GB, type is HBM3e versus HBM3, bus width is 8192 bit versus 6144 bit, and bandwidth is 6.14 TB/s versus 4.03 TB/s.

Compute units differ: AMD has 19,456 shading units, 1,216 TMUs, and 0 ROPs, while NVIDIA has 9,984 shading units, 312 TMUs, and 24 ROPs. NVIDIA has 312 tensor cores; AMD lists none. Pixel rates are 0 MPixel/s versus 47.52 GPixel/s, and texture rates are 2,553.6 GTexel/s versus 617.8 GTexel/s. FP32 throughput is 81.72 TFLOPS versus 39.54 TFLOPS, and FP16 is 81.72 TFLOPS (1:1) versus 79.07 TFLOPS (2:1).

Power specifications are 1000 W TDP with 1400 W suggested PSU for AMD versus 400 W TDP with 800 W suggested PSU for NVIDIA. The form factor is OAM Module for AMD versus SXM Module for NVIDIA. The power connector field is "None" for AMD and not listed for NVIDIA. Both use PCIe 5.0 x16 and have no display outputs. Both list DirectX, OpenGL, and Vulkan as N/A.

Release dates are October 9, 2024 for AMD and September 1, 2025 for NVIDIA. The AMD part’s predecessor is Radeon Instinct, while the NVIDIA part’s predecessor is Server Ada. Only the NVIDIA part has a successor listed (Server Blackwell) and an active production status. Neither part has a launch MSRP in the database.