NVIDIA H20 vs NVIDIA RTX PRO 4500 Blackwell Server Comparison

The NVIDIA H20 and NVIDIA RTX PRO 4500 Blackwell Server represent two distinct approaches to server acceleration, separated by architecture generation and design philosophy. The H20, built on the Hopper architecture with a GH100 chip, targets massive memory capacity and high-precision compute, while the RTX PRO 4500, featuring the Blackwell 2.0 architecture with a GB203 chip, delivers higher raw throughput in a much more power-efficient package. The data shows clear trade-offs between memory bandwidth, compute throughput, and power consumption, making each card suitable for different workloads.

The Verdict

The benchmark data, though lacking direct head-to-head scores, reveals a clear division of purpose. The NVIDIA H20 is the choice for memory-bound workloads. Its 96 GB of HBM3 memory and 4.03 TB/s bandwidth dwarf the RTX PRO 4500's 32 GB GDDR7 and 800.3 GB/s, a 3x capacity advantage and 5x bandwidth lead. Any application that requires large model residency or massive dataset streaming will favor the H20. The 6144-bit bus width, versus 256-bit for the RTX PRO 4500, is the architectural driver behind this dominance.

The NVIDIA RTX PRO 4500 Blackwell Server is the pick for compute density and efficiency. Its FP32 throughput of 50.70 TFLOPS is 28% ahead of the H20's 39.54 TFLOPS. The pixel rate advantage is even more pronounced: 270.5 GPixel/s versus 47.52 GPixel/s, a 5.7x margin. Critically, the RTX PRO 4500 achieves this with a 165 W TDP, versus 500 W for the H20, a 67% reduction in power draw. For rack-scale deployments where power density is a constraint, the RTX PRO 4500 delivers more compute per watt.

The data indicates the RTX PRO 4500 is the newer design, with a release date of March 2026 versus January 2024 for the H20. The predecessor-successor chain in the database confirms this: the H20 is listed as the predecessor to the RTX PRO 4500. Users requiring the latest feature set, including DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 API support, should select the RTX PRO 4500, as the H20 reports no API support at all. The H20's SXM module form factor also limits its deployment to specialized server chassis, while the RTX PRO 4500's single-slot, 267 mm length design offers broader compatibility.

Architecture Differences

The two GPUs come from different architecture families. The H20 uses the Hopper architecture with the GH100 chip, a design focused on data center scale-out and high-bandwidth memory. The RTX PRO 4500 uses Blackwell 2.0 with the GB203 chip, a newer generation that emphasizes higher clock speeds and compute efficiency. Both are fabricated on a 5 nm process at TSMC, but the die designs differ substantially. The GH100 measures 814 mm² with 80,000 million transistors, yielding a density of 98.3M transistors per mm². The GB203 is smaller at 378 mm² with 45,600 million transistors, achieving a higher density of 120.6M per mm², indicating a more compact and efficient layout.

The H20's memory subsystem is built around HBM3, a stacked memory technology that provides enormous bandwidth but is expensive and complex to integrate. The RTX PRO 4500 uses GDDR7, a more conventional discrete memory type. This difference explains the memory capacity and bandwidth gap: 96 GB versus 32 GB, and 4.03 TB/s versus 800.3 GB/s. The H20's 6144-bit memory bus is a direct consequence of HBM3's wide interface, while the RTX PRO 4500's 256-bit bus is typical for GDDR7.

Compute resources also differ. The H20 has 9984 shading units, 312 TMUs, and 24 ROPs, with 312 tensor cores. The RTX PRO 4500 has 10496 shading units, 328 TMUs, and 112 ROPs, with 82 dedicated ray tracing cores and 328 tensor cores. The RTX PRO 4500's ROP count is nearly 5x higher, which directly explains its pixel rate advantage. Clock speeds show a divergent strategy: the H20 has a higher base clock (1830 MHz versus 1215 MHz) but a lower boost clock (1980 MHz versus 2415 MHz). The RTX PRO 4500's boost clock is 22% higher, contributing to its FP32 throughput lead.

FAQ

Q: Which GPU has more memory bandwidth?

A: The NVIDIA H20. Its HBM3 memory delivers 4.03 TB/s, compared to 800.3 GB/s for the RTX PRO 4500. The H20 also has a wider 6144-bit bus versus 256-bit.

Q: What is the power consumption difference?

A: The H20 has a TDP of 500 W, while the RTX PRO 4500 is rated at 165 W. The suggested PSU rating is 900 W for the H20 and 450 W for the RTX PRO 4500.

Q: Which card has a higher FP32 compute throughput?

A: The RTX PRO 4500 Blackwell Server. It delivers 50.70 TFLOPS FP32, versus 39.54 TFLOPS for the H20, a 28% advantage.

Q: Do these cards support display outputs?

A: No. Both the H20 and the RTX PRO 4500 are listed as having no display outputs, indicating they are compute-only server accelerators.

Q: What is the release date difference?

A: The H20 was released in January 2024, while the RTX PRO 4500 has a release date of March 2026, making it a newer product by over two years.

Q: Which GPU has ray tracing cores?

A: Only the RTX PRO 4500 has dedicated ray tracing cores, with 82 units. The H20 lists no RT core count in the database.

Specification Differences

The two GPUs diverge across nearly every specification category. The H20 uses the GH100 chip with Hopper architecture, while the RTX PRO 4500 uses the GB203 chip with Blackwell 2.0 architecture. The H20's die is 814 mm² with 80,000 million transistors, while the RTX PRO 4500's die is 378 mm² with 45,600 million transistors. Transistor density favors the RTX PRO 4500 at 120.6M per mm² versus 98.3M per mm².

Clock speeds differ significantly. The H20 has a base clock of 1830 MHz and boost of 1980 MHz, while the RTX PRO 4500 has a base of 1215 MHz and boost of 2415 MHz. Memory clocks are also different: the H20 runs at 1313 MHz (5.3 Gbps effective), while the RTX PRO 4500 runs at 1563 MHz (25 Gbps effective).

Memory configuration is a major separator. The H20 has 96 GB HBM3 with a 6144-bit bus and 4.03 TB/s bandwidth. The RTX PRO 4500 has 32 GB GDDR7 with a 256-bit bus and 800.3 GB/s bandwidth. The H20's memory capacity is 3x larger, and its bandwidth is 5x higher.

Compute resources show a mixed picture. The H20 has 9984 shading units, 312 TMUs, and 24 ROPs. The RTX PRO 4500 has 10496 shading units, 328 TMUs, and 112 ROPs. The RTX PRO 4500 has 82 RT cores, while the H20 has none listed. Both have 312 and 328 tensor cores respectively. Pixel rate favors the RTX PRO 4500 at 270.5 GPixel/s versus 47.52 GPixel/s, while texture rate is 792.1 GTexel/s versus 617.8 GTexel/s.

Power and physical specifications differ. The H20 has a 500 W TDP and is an SXM module, while the RTX PRO 4500 has a 165 W TDP and is a single-slot card with a 16-pin power connector. The suggested PSU is 900 W for the H20 and 450 W for the RTX PRO 4500. The RTX PRO 4500 has dimensions of 267 mm length, 111 mm height, and 40 mm width. The H20 lists no dimensions. The H20 has no API support, while the RTX PRO 4500 supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Head-to-Head Benchmarks

The database does not contain direct head-to-head benchmark scores for these two GPUs. However, the recorded specification data provides a basis for comparative analysis of their expected performance.

The most decisive advantage for the H20 is memory bandwidth. Its 4.03 TB/s is roughly 5x the RTX PRO 4500's 800.3 GB/s. This translates to a 4.03 TB/s versus 0.80 TB/s difference, a 5.04x ratio. For memory-intensive operations such as large language model inference or high-resolution tensor operations, this bandwidth advantage is likely to dominate any compute throughput differences. The H20's 96 GB capacity also allows it to hold models that would exceed the RTX PRO 4500's 32 GB, avoiding memory swapping.

The RTX PRO 4500 counters with a compute throughput advantage. Its FP32 rating of 50.70 TFLOPS is 11.16 TFLOPS higher than the H20's 39.54 TFLOPS, a 28.2% lead. This advantage is amplified in pixel processing: 270.5 GPixel/s versus 47.52 GPixel/s, a 5.7x margin. The RTX PRO 4500's 112 ROPs versus 24 ROPs is the primary driver of this pixel rate difference. Texture rate also favors the RTX PRO 4500, at 792.1 GTexel/s versus 617.8 GTexel/s, a 28.2% advantage.

Power efficiency is a clear win for the RTX PRO 4500. It achieves 50.70 TFLOPS FP32 within a 165 W TDP, while the H20 requires 500 W for 39.54 TFLOPS. This results in a compute-per-watt ratio of roughly 0.307 TFLOPS/W for the RTX PRO 4500 versus 0.079 TFLOPS/W for the H20. The RTX PRO 4500 is approximately 3.9x more efficient in FP32 throughput per watt. The suggested PSU figures reinforce this: 450 W for the RTX PRO 4500 versus 900 W for the H20.

The RTX PRO 4500 also benefits from a higher boost clock of 2415 MHz versus 1980 MHz for the H20. This 22% clock advantage contributes to its higher FP32 and pixel rates. The H20's higher base clock of 1830 MHz versus 1215 MHz suggests it maintains performance under sustained load, but the RTX PRO 4500's boost behavior provides a superior peak performance profile.

The H20's FP16 throughput is 79.07 TFLOPS (2:1), which is higher than its FP32 rate, indicating a specialized mixed-precision capability. The RTX PRO 4500 has a 1:1 FP16/FP32 ratio at 50.70 TFLOPS, meaning it does not offer a throughput boost for half-precision workloads. This makes the H20 more suitable for FP16-heavy workloads, where it offers 56% more FP16 throughput than the RTX PRO 4500, despite the RTX PRO 4500's FP32 lead.

The RTX PRO 4500's ray tracing capability, with 82 RT cores, gives it a feature that the H20 entirely lacks. This is relevant for any rendering or ray-traced compute workloads, though the "No outputs" designation on both cards suggests they are not intended for direct display tasks.

In summary, the data confirms a specialization split. The H20 excels in memory capacity, bandwidth, and FP16 throughput. The RTX PRO 4500 excels in FP32 compute, pixel rate, power efficiency, and features such as ray tracing and modern API support. The choice between them depends on whether the workload is memory-bound or compute-bound.