NVIDIA H20 vs NVIDIA RTX PRO 4000 Blackwell Comparison

The Verdict

The NVIDIA H20 and NVIDIA RTX PRO 4000 Blackwell serve fundamentally different purposes, and the data makes that split explicit. The H20 is a server-oriented Hopper part with a massive 96 GB HBM3 memory pool, a 6144-bit bus, and no display outputs, built for memory-bound data center workloads. The RTX PRO 4000 Blackwell is a workstation GPU with 24 GB GDDR7, four DisplayPort outputs, and full graphics API support, designed for professional visualization and compute. The recorded benchmarks only cover the RTX PRO 4000 Blackwell, which holds a 72nd percentile ranking among all GPUs, while the H20 has no benchmark scores in the database, giving it a 50th percentile default. The H20 wins on raw memory capacity and bandwidth, while the RTX PRO 4000 Blackwell wins on graphics features, API compatibility, and power efficiency. Users who need massive memory for large model inference should choose the H20; users who need a single-slot workstation card with display outputs and modern graphics APIs should choose the RTX PRO 4000 Blackwell.

Architecture Differences

The two GPUs come from different architectural generations. The H20 uses the GH100 chip on the Hopper architecture, built on a 5 nm process at TSMC, with 80,000 million transistors on a die size of 814 mm², resulting in a transistor density of 98.3M per mm². The RTX PRO 4000 Blackwell uses the GB203 chip on the Blackwell 2.0 architecture, also on a 5 nm process at TSMC, but with 45,600 million transistors on a much smaller die of 378 mm², achieving a higher transistor density of 120.6M per mm². The H20 belongs to the Server Hopper (Hxx) generation, while the RTX PRO 4000 Blackwell belongs to the Blackwell PRO W (x000) generation. The H20's predecessor is Server Ada, and its successor is Server Blackwell; the RTX PRO 4000 Blackwell's predecessor is Workstation Ada, and it has no successor listed.

The H20's memory subsystem is its defining feature: 96 GB of HBM3 on a 6144-bit bus with 4.03 TB/s bandwidth. The RTX PRO 4000 Blackwell uses 24 GB of GDDR7 on a 192-bit bus with 672.0 GB/s bandwidth. The H20 has no display outputs, while the RTX PRO 4000 Blackwell has 4x DisplayPort 2.1b outputs. API support also differs sharply: the H20 lists DirectX, OpenGL, and Vulkan as N/A, while the RTX PRO 4000 Blackwell supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The H20 is an SXM Module with a 500 W TDP and a 900 W suggested PSU; the RTX PRO 4000 Blackwell is a single-slot card with a 140 W TDP, a 1x 16-pin power connector, and a 300 W suggested PSU.

The H20 has more shading units (9984 vs 8960), more TMUs (312 vs 280), and more tensor cores (312 vs 280), but far fewer ROPs (24 vs 96). The RTX PRO 4000 Blackwell has 70 ray tracing cores, while the H20 lists none. Clock speeds favor the RTX PRO 4000 Blackwell in boost terms: the H20 has a base clock of 1830 MHz and a boost of 1980 MHz, while the RTX PRO 4000 Blackwell has a base of 1230 MHz and a boost of 2055 MHz. Memory clocks differ significantly: the H20 runs at 1313 MHz with 5.3 Gbps effective, while the RTX PRO 4000 Blackwell runs at 1750 MHz with 28 Gbps effective.

FAQ

Q: Which GPU has more memory bandwidth?

A: The NVIDIA H20 has 4.03 TB/s of bandwidth from its 96 GB HBM3 memory on a 6144-bit bus. The RTX PRO 4000 Blackwell has 672.0 GB/s from 24 GB GDDR7 on a 192-bit bus.

Q: Does the H20 support display outputs?

A: No. The H20 lists "No outputs" for display outputs, while the RTX PRO 4000 Blackwell has 4x DisplayPort 2.1b.

Q: Which GPU supports modern graphics APIs?

A: The RTX PRO 4000 Blackwell supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The H20 lists DirectX, OpenGL, and Vulkan as N/A.

Q: What are the power requirements for each?

A: The H20 has a 500 W TDP with a 900 W suggested PSU. The RTX PRO 4000 Blackwell has a 140 W TDP with a 300 W suggested PSU.

Q: Which GPU has more ray tracing cores?

A: The RTX PRO 4000 Blackwell has 70 ray tracing cores. The H20 lists no ray tracing core count in the database.

Q: What is the release timeline for these GPUs?

A: The H20 was released on 2024-01-31, and the RTX PRO 4000 Blackwell was released on 2025-03-17. Both are listed as Active in production status.

Specification Differences

The two GPUs differ across nearly every measurable specification. Process node is identical at 5 nm from TSMC, but transistor count, die size, and density all differ. The H20 has 80,000 million transistors on 814 mm², while the RTX PRO 4000 Blackwell has 45,600 million on 378 mm². Transistor density is higher on the Blackwell part: 120.6M per mm² vs 98.3M per mm².

Clock speeds differ in both base and boost. The H20 runs at 1830 MHz base and 1980 MHz boost; the RTX PRO 4000 Blackwell runs at 1230 MHz base and 2055 MHz boost. Memory clocks are 1313 MHz (5.3 Gbps effective) for the H20 and 1750 MHz (28 Gbps effective) for the RTX PRO 4000 Blackwell.

Memory capacity, type, bus width, and bandwidth all favor the H20: 96 GB HBM3 on 6144-bit with 4.03 TB/s vs 24 GB GDDR7 on 192-bit with 672.0 GB/s. Compute units also differ: the H20 has 9984 shading units, 312 TMUs, 24 ROPs, and 312 tensor cores; the RTX PRO 4000 Blackwell has 8960 shading units, 280 TMUs, 96 ROPs, 70 RT cores, and 280 tensor cores.

Pixel rate heavily favors the RTX PRO 4000 Blackwell at 197.3 GPixel/s vs 47.52 GPixel/s for the H20. Texture rate slightly favors the H20 at 617.8 GTexel/s vs 575.4 GTexel/s. FP32 compute is close: the H20 delivers 39.54 TFLOPS, and the RTX PRO 4000 Blackwell delivers 36.83 TFLOPS. FP16 differs in ratio: the H20 delivers 79.07 TFLOPS (2:1), while the RTX PRO 4000 Blackwell delivers 36.83 TFLOPS (1:1).

Form factor and power differ substantially. The H20 is an SXM Module with a 500 W TDP and 900 W suggested PSU; the RTX PRO 4000 Blackwell is single-slot, 241 mm long, 111 mm tall, 20 mm wide, with a 140 W TDP, a 1x 16-pin power connector, and a 300 W suggested PSU. Bus interface is PCIe 5.0 x16 for both. The H20 has no display outputs; the RTX PRO 4000 Blackwell has 4x DisplayPort 2.1b. The H20 has no API support listed, while the RTX PRO 4000 Blackwell supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Head-to-Head Benchmarks

The database contains benchmark scores for the RTX PRO 4000 Blackwell only. The H20 has zero recorded benchmarks, so direct comparisons rely on the RTX PRO 4000 Blackwell's absolute scores and its nearest rival deltas. The RTX PRO 4000 Blackwell achieves an average benchmark score of 27135, placing it in the 72nd percentile of all GPUs. Its nearest rivals are the AMD Radeon RX 6700 XT with an average score of 27425 (1.1% higher), the NVIDIA GeForce RTX 4070 Mobile with 27435 (1.1% higher), the NVIDIA GeForce RTX 3090 with 27565 (1.6% higher), and the NVIDIA RTX A4000 with 26683 (1.7% lower). This puts the RTX PRO 4000 Blackwell in a tight cluster, slightly behind the RX 6700 XT, RTX 4070 Mobile, and RTX 3090, but slightly ahead of the RTX A4000.

Individual benchmark scores for the RTX PRO 4000 Blackwell show its strongest result in Geekbench Vulkan with 194168 points. In 3DMark Steel Nomad DX12, it scores 4648. PassMark results include G3D at 28427, GPU Compute at 14805, G2D at 1265, DirectX 9 at 354, DirectX 11 at 276, DirectX 10 at 173, and DirectX 12 at 97. The spread between DirectX 9 (354) and DirectX 12 (97) shows a pattern where older API workloads score higher, while the Vulkan score dominates all others by a wide margin.

Since the H20 has no benchmark entries, the head-to-head comparison is one-sided. The database records zero wins for the H20 and zero wins for the RTX PRO 4000 Blackwell in head-to-head benchmarks, because no shared tests exist. The RTX PRO 4000 Blackwell's percentile of 72 versus the H20's 50 reflects the availability of benchmark data more than intrinsic performance, as the H20's score is a default placeholder.

Where Each One Wins

The RTX PRO 4000 Blackwell wins in every measurable graphics benchmark category because it is the only one with recorded scores. Its 72nd percentile ranking and average score of 27135 place it competitively among its nearest rivals, all within a 3% band. The GPU compute score of 14805 indicates solid compute throughput for a workstation card, while the 197.3 GPixel/s pixel rate and 96 ROPs make it suitable for rasterization-heavy tasks. The 70 RT cores and DirectX 12 Ultimate support give it a clear path for ray-traced workloads, and the 4x DisplayPort 2.1b outputs enable multi-monitor professional setups.

The H20 wins on memory capacity and bandwidth by an enormous margin: 96 GB vs 24 GB, and 4.03 TB/s vs 672.0 GB/s. This makes it the choice for workloads where model size or dataset footprint exceeds 24 GB, which the RTX PRO 4000 Blackwell cannot accommodate. The H20's FP16 throughput of 79.07 TFLOPS (2:1) doubles its FP32 rate, which is advantageous for mixed-precision training and inference. Its 312 tensor cores versus 280 on the RTX PRO 4000 Blackwell provides more parallel tensor throughput. The H20's SXM form factor and lack of display outputs indicate it belongs in a server chassis, not a workstation desk.

The RTX PRO 4000 Blackwell wins on power efficiency: 140 W TDP versus 500 W, with a 300 W suggested PSU versus 900 W. It also wins on physical footprint, as a single-slot card with defined dimensions (241 mm length, 111 mm height, 20 mm width) versus an SXM module. The RTX PRO 4000 Blackwell has a higher boost clock (2055 MHz vs 1980 MHz) and a higher pixel rate (197.3 GPixel/s vs 47.52 GPixel/s), which benefits graphics-bound tasks. The H20 has a higher texture rate (617.8 GTexel/s vs 575.4 GTexel/s) and slightly higher FP32 (39.54 TFLOPS vs 36.83 TFLOPS), which benefits compute-bound tasks.

For users choosing between these two, the decision hinges on workload type. The H20 targets server-side inference and training with its 96 GB memory pool, while the RTX PRO 4000 Blackwell targets workstation graphics, visualization, and API-complete compute. The RTX PRO 4000 Blackwell's release date of 2025-03-17 is later than the H20's 2024-01-31, and it benefits from the Blackwell 2.0 architecture's higher transistor density. The H20's 80 billion transistors on a 814 mm² die show a different design priority: raw memory bandwidth over graphics features. Both are Active in production, and both use PCIe 5.0 x16, but their target environments are distinct. The data shows a clear split: memory-heavy server compute versus feature-complete workstation graphics.