NVIDIA H20 vs NVIDIA RTX PRO 4500 Blackwell Comparison

FAQ

Q: What are the two GPUs compared in this analysis?

A: The NVIDIA H20 is a server-oriented Hopper architecture accelerator built on the GH100 chip, released in January 2024. The NVIDIA RTX PRO 4500 Blackwell is a workstation-focused GPU using the GB203 chip with Blackwell 2.0 architecture, released in March 2025.

Q: How do the memory configurations differ between the H20 and RTX PRO 4500?

A: The H20 uses 96 GB of HBM3 memory with a 6144-bit bus and delivers 4.03 TB/s bandwidth. The RTX PRO 4500 uses 32 GB of GDDR7 memory on a 256-bit bus with 896.0 GB/s bandwidth.

Q: Which GPU has higher FP32 compute throughput?

A: The RTX PRO 4500 delivers 50.53 TFLOPS FP32, which is higher than the H20's 39.54 TFLOPS. However, the H20 has significantly higher FP16 throughput at 79.07 TFLOPS (2:1), while the RTX PRO 4500 provides 50.53 TFLOPS (1:1).

Q: What is the power consumption difference between the two cards?

A: The H20 has a 500 W TDP with a suggested 900 W power supply, while the RTX PRO 4500 has a 200 W TDP with a suggested 550 W power supply. The RTX PRO 4500 uses a single 16-pin power connector, while the H20 is an SXM Module with no listed power connectors.

Q: Does the H20 support display outputs?

A: No, the H20 has no display outputs, making it strictly a compute accelerator for server environments. The RTX PRO 4500 includes 4x DisplayPort 2.1b outputs.

Q: What benchmark scores are available for these GPUs?

A: The database contains benchmark scores only for the RTX PRO 4500, including a 3DMark Steel Nomad DX12 score of 7025, a Geekbench Vulkan score of 221768, and PassMark G3D score of 33360. No benchmark scores are recorded for the H20.

Architecture Differences

The two GPUs belong to different architectural generations with distinct design goals. The H20 uses the GH100 chip built on Hopper architecture, a server-first design with a 5 nm TSMC process. It packs 80,000 million transistors across an 814 mm² die, resulting in a transistor density of 98.3M per mm². The RTX PRO 4500 uses the GB203 chip with Blackwell 2.0 architecture, also on a 5 nm TSMC process, but with 45,600 million transistors on a smaller 378 mm² die, achieving a higher density of 120.6M per mm².

The H20's Hopper architecture is fundamentally server-oriented. It has no display outputs, no DirectX, OpenGL, or Vulkan API support, and is designed as an SXM Module. The RTX PRO 4500, by contrast, is a workstation GPU with full API support including DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, plus four DisplayPort 2.1b outputs. These design differences reflect their intended deployment environments: dense server racks versus professional workstation chassis.

Compute resources differ substantially. The H20 has 9,984 shading units, 312 TMUs, and only 24 ROPs. The RTX PRO 4500 has 10,496 shading units, 328 TMUs, and 112 ROPs. The ROP disparity is notable, with the RTX PRO 4500 providing more than four times the pixel output capability. The H20 has 312 tensor cores with no listed RT cores, while the RTX PRO 4500 provides 328 tensor cores and 82 RT cores, enabling hardware ray tracing that the H20 lacks.

Clock behavior also differs. The H20 runs at a base clock of 1830 MHz and boosts to 1980 MHz. The RTX PRO 4500 has a lower base clock of 1635 MHz but boosts higher to 2407 MHz. The memory clocks differ significantly as well: the H20 uses 1313 MHz (5.3 Gbps effective) HBM3, while the RTX PRO 4500 uses 1750 MHz (28 Gbps effective) GDDR7.

The H20's transistor budget is nearly double that of the RTX PRO 4500, but it is spread across a much larger die with a lower density. The architecture prioritizes memory capacity and bandwidth for large-scale compute workloads, while the RTX PRO 4500 balances compute, graphics, and display capabilities in a smaller, more power-efficient package.

Head-to-Head Benchmarks

Direct benchmark comparisons are limited because the database records scores only for the RTX PRO 4500. The H20 has no recorded benchmark entries, so a full head-to-head score comparison is not possible from the available data. What the data does show is the RTX PRO 4500's performance profile across multiple test suites.

The RTX PRO 4500 achieves a 3DMark Steel Nomad DX12 score of 7025. In Geekbench Vulkan, it records 221768 points. PassMark results show a G3D score of 33360 and a GPU compute score of 19255. DirectX-specific PassMark tests return 204 for DX10, 320 for DX11, 119 for DX12, and 397 for DX9. The G2D test records 1336.

The RTX PRO 4500's average benchmark score is 31532, placing it in the 76th percentile of all GPUs in the database. Its nearest rivals in the database are the NVIDIA TITAN RTX with an average score of 31676 (0.5% higher), the NVIDIA GRID M60-1Q at 31220 (1% lower), the NVIDIA Quadro M5000 at 31206 (1% lower), and the Intel Arc Pro A30M at 31894 (1.1% higher). These deltas are all within roughly one percent, indicating that the RTX PRO 4500 sits in a tightly competitive performance band despite its architectural differences from those older products.

The H20's absence of benchmark records means its performance can be assessed only through its theoretical specifications. Its FP32 throughput of 39.54 TFLOPS is about 22% lower than the RTX PRO 4500's 50.53 TFLOPS. In FP16, however, the H20's 79.07 TFLOPS is about 56% higher than the RTX PRO 4500's 50.53 TFLOPS. The H20's memory bandwidth of 4.03 TB/s is roughly 4.5 times the RTX PRO 4500's 896.0 GB/s. These specification gaps suggest the H20 is designed for memory-bound and FP16-heavy workloads, while the RTX PRO 4500 favors FP32 and graphics tasks.

Specification Differences

The following specifications differ between the NVIDIA H20 and NVIDIA RTX PRO 4500 Blackwell:

• Chip: GH100 versus GB203
• Architecture: Hopper versus Blackwell 2.0
• Generation: Server Hopper (Hxx) versus Blackwell PRO W (x000)
• Transistors: 80,000 million versus 45,600 million
• Die size: 814 mm² versus 378 mm²
• Transistor density: 98.3M per mm² versus 120.6M per mm²
• Base clock: 1830 MHz versus 1635 MHz
• Boost clock: 1980 MHz versus 2407 MHz
• Memory clock: 1313 MHz (5.3 Gbps effective) versus 1750 MHz (28 Gbps effective)
• Memory size: 96 GB versus 32 GB
• Memory type: HBM3 versus GDDR7
• Memory bus width: 6144 bit versus 256 bit
• Memory bandwidth: 4.03 TB/s versus 896.0 GB/s
• Shading units: 9,984 versus 10,496
• TMUs: 312 versus 328
• ROPs: 24 versus 112
• RT cores: not listed versus 82
• Tensor cores: 312 versus 328
• Pixel rate: 47.52 GPixel/s versus 269.6 GPixel/s
• Texture rate: 617.8 GTexel/s versus 789.5 GTexel/s
• FP32: 39.54 TFLOPS versus 50.53 TFLOPS
• FP16: 79.07 TFLOPS (2:1) versus 50.53 TFLOPS (1:1)
• TDP: 500 W versus 200 W
• Slot width: SXM Module versus Dual-slot
• Power connectors: not listed versus 1x 16-pin
• Suggested PSU: 900 W versus 550 W
• Display outputs: none versus 4x DisplayPort 2.1b
• DirectX support: N/A versus 12 Ultimate (12_2)
• OpenGL support: N/A versus 4.6
• Vulkan support: N/A versus 1.4
• Dimensions: not listed versus 267 mm length, 111 mm height, 40 mm width
• Release date: 2024-01-31 versus 2025-03-17
• Predecessor: Server Ada versus Workstation Ada
• Successor: Server Blackwell versus not listed

Where Each One Wins

The RTX PRO 4500 Blackwell wins in graphics rendering and workstation compute. Its 50.53 TFLOPS FP32 performance exceeds the H20 by roughly 28%, and its 112 ROPs deliver a pixel rate of 269.6 GPixel/s compared to the H20's 47.52 GPixel/s. The RTX PRO 4500 also provides hardware ray tracing with 82 RT cores, full API support across DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, and four DisplayPort 2.1b outputs. Its 200 W TDP is 60% lower than the H20's 500 W, and its dual-slot form factor with a single 16-pin connector makes it suitable for workstation chassis. The recorded benchmark scores, including a PassMark G3D score of 33360 and a Geekbench Vulkan score of 221768, confirm its capability in real-world graphics workloads. The 76th percentile ranking and an average score of 31532 put it in competitive standing against the TITAN RTX, GRID M60-1Q, Quadro M5000, and Arc Pro A30M, all within 1.1% of its average score.

The H20 wins in memory capacity, memory bandwidth, and FP16 compute. Its 96 GB of HBM3 memory provides three times the capacity of the RTX PRO 4500's 32 GB, and its 4.03 TB/s bandwidth is roughly 4.5 times the RTX PRO 4500's 896.0 GB/s. The H20's FP16 throughput of 79.07 TFLOPS is 56% higher than the RTX PRO 4500's 50.53 TFLOPS, making it better suited for workloads that rely on reduced-precision arithmetic. Its 6144-bit memory bus and 500 W TDP indicate a design focused on sustained, high-bandwidth compute in server environments. The H20 has no display outputs and no graphics API support, so its utility is confined to compute-only deployments. Its 9,984 shading units are slightly fewer than the RTX PRO 4500's 10,496, but the H20 compensates with a larger tensor core count per memory subsystem and substantially higher memory throughput.

The data indicates a clear division of roles. The RTX PRO 4500 is the choice for professional graphics, visualization, and general FP32 compute where API support, ray tracing, and display connectivity matter. The H20 is the choice for large-scale memory-intensive compute, especially FP16 workloads where capacity and bandwidth dominate. The H20's 50th percentile ranking versus the RTX PRO 4500's 76th percentile reflects their different target markets rather than a direct performance hierarchy, since the H20 has no benchmark scores in the database to compare directly.