NVIDIA RTX PRO 4500 Blackwell Server vs NVIDIA Rubin GPU Comparison

Head-to-Head Benchmarks

The recorded data shows a stark performance separation between the NVIDIA RTX PRO 4500 Blackwell Server and the NVIDIA Rubin GPU. Although the benchmark suite contains no direct head-to-head scores for either part, the specification-level measurements provide a quantitative basis for comparison. The most decisive gap occurs in raw compute throughput: the Rubin GPU delivers 130.0 TFLOPS of FP32 performance, which is 156% higher than the RTX PRO 4500's 50.70 TFLOPS. That difference translates into the Rubin GPU being roughly 2.56 times faster in single-precision workloads, a margin that dominates any other comparative metric.

The FP16 comparison widens further. The RTX PRO 4500 delivers 50.70 TFLOPS of FP16 with a 1:1 ratio, meaning its FP16 throughput equals its FP32 figure. The Rubin GPU, however, achieves 260.0 TFLOPS of FP16 with a 2:1 ratio, which is over five times the FP16 output of the RTX PRO 4500. This 5.13x advantage in half-precision compute is the single largest performance delta between the two parts in the database. For workloads that rely heavily on FP16 tensor operations, such as large-scale neural network training or inference, the Rubin GPU holds an overwhelming lead.

Memory bandwidth presents another major divergence. The RTX PRO 4500 uses a 256-bit GDDR7 interface with 800.3 GB/s of bandwidth. The Rubin GPU, by contrast, employs a 16384-bit HBM4 interface delivering 22.1 TB/s. That is a 27.6-fold increase in memory bandwidth, which fundamentally changes what each card can accomplish. The RTX PRO 4500's bandwidth is sufficient for typical server-side rendering or moderate AI inference, but the Rubin GPU's 22.1 TB/s is in a different class entirely, enabling it to feed its 28672 shading units without memory stalls.

Texture throughput also favors the Rubin GPU decisively. The RTX PRO 4500 achieves 792.1 GTexel/s from 328 TMUs, while the Rubin GPU reaches 2,031.2 GTexel/s from 896 TMUs. That is a 2.56x advantage in texture rate, consistent with the FP32 core count ratio. Pixel rate, however, tells a different story: the RTX PRO 4500 outputs 270.5 GPixel/s from 112 ROPs, whereas the Rubin GPU manages only 54.41 GPixel/s from a mere 24 ROPs. The RTX PRO 4500 is 4.97 times faster in pixel throughput, which is a surprising inversion given the Rubin GPU's dominance elsewhere.

The shading unit count reinforces the compute gap. The Rubin GPU packs 28,672 shading units against the RTX PRO 4500's 10,496, a 2.73x difference. Tensor core counts follow the same pattern: 896 tensor cores on the Rubin GPU versus 328 on the RTX PRO 4500. The RTX PRO 4500 does include 82 dedicated RT cores, while the Rubin GPU's RT core count is not listed in the database, so ray tracing parity cannot be established numerically. Clock speeds also diverge, with the RTX PRO 4500 boosting to 2415 MHz versus the Rubin GPU's 2267 MHz, but the lower clock on the Rubin GPU is more than compensated by its massive core count.

The Verdict

The data points to two entirely different deployment profiles. The NVIDIA RTX PRO 4500 Blackwell Server is a single-slot, 165 W PCIe 5.0 x16 card designed for density-sensitive server environments that need moderate compute with minimal power draw. Its 32 GB of GDDR7 memory and 800.3 GB/s bandwidth are adequate for many server-side visualization or inference tasks. The Rubin GPU, in contrast, is a 2300 W SXM module with 288 GB of HBM4 memory and 22.1 TB/s of bandwidth, built for maximum throughput in HPC and AI clusters where power and space constraints are secondary.

Benchmark results indicate that the Rubin GPU wins decisively in FP32, FP16, texture rate, and memory bandwidth, with leads ranging from 2.56x to 27.6x. The RTX PRO 4500 wins only in pixel rate, where its 270.5 GPixel/s is 4.97x higher than the Rubin GPU's 54.41 GPixel/s, and in clock speed, where its 2415 MHz boost exceeds the Rubin GPU's 2267 MHz. The RTX PRO 4500 also supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the Rubin GPU lists N/A for all three APIs, meaning the Rubin GPU is not positioned for graphics API workloads.

The Rubin GPU's transistor count of 336,000 million on a 1456 mm² die is 7.37 times the RTX PRO 4500's 45,600 million transistors on a 378 mm² die. The process node difference, 3 nm versus 5 nm, partially explains how the Rubin GPU fits its enormous transistor budget. The RTX PRO 4500's transistor density is 120.6M per mm², while the Rubin GPU reaches 230.8M per mm², a 1.91x density improvement. For any workload that can utilize massive parallelism, the Rubin GPU is the clear choice. For tasks requiring rasterization throughput or graphics API compatibility, the RTX PRO 4500 is the only viable option between the two.

Architecture Differences

The two GPUs belong to different architectural generations. The RTX PRO 4500 uses the GB203 chip built on the Blackwell 2.0 architecture, which the database classifies under the Server Blackwell (Bxx) generation. The Rubin GPU uses the GR100 chip on the Rubin architecture, classified under Server Rubin (Rxx). This architectural separation is the root cause of nearly every performance difference recorded.

The fabrication process differs by two nodes: the RTX PRO 4500 is built on TSMC's 5 nm process, while the Rubin GPU uses TSMC's 3 nm process. The die sizes reflect the scale disparity, with the RTX PRO 4500 at 378 mm² and the Rubin GPU at 1456 mm². Transistor counts scale accordingly, from 45,600 million to 336,000 million. The transistor density also improves, from 120.6M per mm² on the RTX PRO 4500 to 230.8M per mm² on the Rubin GPU.

Memory architecture is fundamentally different. The RTX PRO 4500 uses GDDR7 on a 256-bit bus, which is a conventional graphics memory design. The Rubin GPU uses HBM4 on a 16384-bit bus, a stacked memory configuration that explains the 22.1 TB/s bandwidth figure. The RTX PRO 4500's memory clock is 1563 MHz with 25 Gbps effective, while the Rubin GPU runs at 2695 MHz with 10.8 Gbps effective per pin, but the massive bus width multiplies total bandwidth.

The compute feature sets differ as well. The RTX PRO 4500 supports FP16 at a 1:1 ratio with FP32, meaning no throughput penalty for half-precision. The Rubin GPU uses a 2:1 ratio, doubling FP16 throughput relative to FP32. This indicates a design optimized for mixed-precision AI workloads. The RTX PRO 4500 includes RT cores (82 of them), but the Rubin GPU's RT core count is not recorded in the database. The API support also diverges: the RTX PRO 4500 lists DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the Rubin GPU lists N/A for all three.

Specification Differences

The RTX PRO 4500 has 10,496 shading units, 328 TMUs, and 112 ROPs. The Rubin GPU has 28,672 shading units, 896 TMUs, and 24 ROPs. The shading unit and TMU counts are roughly proportional, but the ROP count is drastically lower on the Rubin GPU, which explains its pixel rate deficit.

Memory capacity differs by 9x: 32 GB on the RTX PRO 4500 versus 288 GB on the Rubin GPU. Memory type differs as GDDR7 versus HBM4. Bus width differs from 256 bit to 16384 bit. Bandwidth differs from 800.3 GB/s to 22.1 TB/s.

The RTX PRO 4500 has a base clock of 1215 MHz and a boost clock of 2415 MHz. The Rubin GPU has a base clock of 700 MHz and a boost clock of 2267 MHz. The RTX PRO 4500 has lower base but higher boost, while the Rubin GPU's lower clocks are offset by its core count.

Power specifications differ dramatically. The RTX PRO 4500 has a TDP of 165 W with a suggested PSU of 450 W, and uses a single 16-pin power connector. The Rubin GPU has a TDP of 2300 W with a suggested PSU of 2700 W, and lists no power connectors because it uses an SXM module form factor. The RTX PRO 4500 is single-slot, while the Rubin GPU is an SXM module with no listed dimensions. The bus interface also differs: PCIe 5.0 x16 for the RTX PRO 4500 versus PCIe 6.0 x16 for the Rubin GPU.

The RTX PRO 4500 has physical dimensions of 267 mm length, 111 mm height, and 40 mm width. The Rubin GPU has no recorded dimensions. Both have no display outputs. The RTX PRO 4500's release date is 2026-03-16, while the Rubin GPU's release date is 2025-12-31. The RTX PRO 4500's predecessor is Server Hopper and its successor is Server Rubin, which is the other item in this comparison. The Rubin GPU's predecessor is Server Blackwell, which is the generation of the RTX PRO 4500.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The NVIDIA Rubin GPU delivers 130.0 TFLOPS of FP32, which is 2.56 times the RTX PRO 4500's 50.70 TFLOPS.

Q: How does memory bandwidth compare between the two?

A: The Rubin GPU has 22.1 TB/s of bandwidth from its 16384-bit HBM4 interface, while the RTX PRO 4500 has 800.3 GB/s from its 256-bit GDDR7 interface, making the Rubin GPU 27.6 times faster in memory bandwidth.

Q: Does the RTX PRO 4500 support graphics APIs?

A: Yes, the RTX PRO 4500 supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The Rubin GPU lists N/A for all three APIs, indicating no graphics API support.

Q: What is the pixel rate difference?

A: The RTX PRO 4500 achieves 270.5 GPixel/s, which is 4.97 times higher than the Rubin GPU's 54.41 GPixel/s, due to the RTX PRO 4500's 112 ROPs versus the Rubin GPU's 24 ROPs.

Q: Which GPU has more shading units?

A: The Rubin GPU has 28,672 shading units, which is 2.73 times the RTX PRO 4500's 10,496 shading units.

Q: What are the power requirements?

A: The RTX PRO 4500 has a TDP of 165 W and a suggested PSU of 450 W. The Rubin GPU has a TDP of 2300 W and a suggested PSU of 2700 W.

Where Each One Wins

The RTX PRO 4500 wins in pixel throughput, delivering 270.5 GPixel/s against the Rubin GPU's 54.41 GPixel/s. This makes it the better choice for workloads that are rasterization-bound, such as traditional rendering pipelines that rely on ROP output. The RTX PRO 4500 also holds a clock speed advantage, with a 2415 MHz boost versus 2267 MHz, which benefits latency-sensitive tasks that do not scale perfectly with core count. The single-slot form factor and 165 W TDP make it suitable for dense server configurations where power and space are limited. Its support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 means it can run graphics applications directly, whereas the Rubin GPU cannot.

The Rubin GPU wins in every compute-heavy category. Its FP32 output of 130.0 TFLOPS is 2.56x higher, its FP16 output of 260.0 TFLOPS is 5.13x higher, and its texture rate of 2,031.2 GTexel/s is 2.56x higher. The 22.1 TB/s memory bandwidth is 27.6x higher than the RTX PRO 4500's 800.3 GB/s, which is essential for feeding its 28,672 shading units and 896 tensor cores. The 288 GB of HBM4 memory is 9x the capacity of the 32 GB GDDR7 on the RTX PRO 4500, enabling much larger datasets to reside on-chip. The Rubin GPU's 2:1 FP16 ratio indicates specialized optimization for half-precision AI workloads. Its PCIe 6.0 x16 interface is one generation newer than the RTX PRO 4500's PCIe 5.0 x16.

For AI training and inference at scale, the Rubin GPU's tensor core count of 896, combined with its 260.0 TFLOPS FP16 throughput and 22.1 TB/s bandwidth, positions it as the dominant part. For server-side visualization, graphics API compatibility, or any workload requiring high pixel fill rates, the RTX PRO 4500 is the only one of the two that can operate in that space. The Rubin GPU's N/A API support and 24 ROPs make it unsuitable for those tasks, regardless of its compute superiority.