NVIDIA RTX PRO 4500 Blackwell Workstation vs NVIDIA Rubin GPU Comparison

Head-to-Head Benchmarks

The database contains no recorded benchmark scores for either the NVIDIA RTX PRO 4500 Blackwell Workstation or the NVIDIA Rubin GPU. Both entries show an average benchmark score of zero, and the head-to-head benchmark array is empty. Consequently, there are no direct performance comparisons to draw from the recorded data. This absence of measurements means the analysis must rely entirely on the architectural specifications and memory configurations listed for each product.

The RTX PRO 4500 Blackwell Workstation delivers 50.53 TFLOPS of FP32 compute and an identical 50.53 TFLOPS of FP16 performance at a 1:1 ratio. The Rubin GPU, in contrast, provides 130.0 TFLOPS of FP32 and 260.0 TFLOPS of FP16 at a 2:1 ratio. In raw FP32 throughput, the Rubin GPU is roughly 2.57 times higher than the workstation card. For FP16 workloads, the Rubin GPU exceeds the RTX PRO 4500 by a factor of approximately 5.15, assuming the 1:1 FP16 rate for the workstation translates directly to the same number as its FP32 figure.

Memory bandwidth tells a more extreme story. The RTX PRO 4500 uses 32 GB of GDDR7 across a 256-bit bus, yielding 896.0 GB/s of bandwidth. The Rubin GPU employs 288 GB of HBM4 across a 16384-bit bus, achieving 22.1 TB/s, which translates to 22,100 GB/s. That is a 24.66-fold advantage in raw memory bandwidth for the Rubin GPU. The workstation card operates at a 1750 MHz memory clock with 28 Gbps effective speed, while the Rubin GPU runs at 2695 MHz with 10.8 Gbps effective speed per pin, though the much wider bus entirely dominates the comparison.

Pixel throughput favors the workstation card in one specific metric. The RTX PRO 4500 achieves 269.6 GPixel/s, while the Rubin GPU reaches only 54.41 GPixel/s. This is a 4.95-fold advantage for the workstation part, a direct result of the Rubin GPU having just 24 ROPs compared to 112 on the RTX PRO 4500. Texture rate, however, goes the other way: 789.5 GTexel/s for the workstation versus 2,031.2 GTexel/s for the Rubin GPU, a 2.57-fold lead for the latter.

Transistor counts and die sizes differ substantially. The RTX PRO 4500 uses 45,600 million transistors on a 378 mm² die, giving a density of 120.6 million transistors per square millimeter. The Rubin GPU packs 336,000 million transistors onto a 1456 mm² die, achieving 230.8 million transistors per square millimeter. The Rubin GPU has 7.37 times more transistors overall, but its die is only 3.85 times larger, indicating a much denser design.

Shader resources are not remotely comparable. The RTX PRO 4500 has 10,496 shading units, 328 TMUs, 82 RT cores, and 328 tensor cores. The Rubin GPU has 28,672 shading units, 896 TMUs, no listed RT core count, and 896 tensor cores. That is 2.73 times more shading units, 2.73 times more TMUs, and 2.73 times more tensor cores for the Rubin GPU. The RTX PRO 4500 has 112 ROPs versus 24 on the Rubin GPU, a 4.67-fold difference in the workstation's favor.

Clock speeds present a mixed picture. The RTX PRO 4500 has a base clock of 1635 MHz and a boost clock of 2407 MHz. The Rubin GPU has a much lower base of 700 MHz but a boost of 2267 MHz, only 5.8% below the workstation's boost. The workstation's higher base clock suggests better sustained performance at lower power states, while the Rubin GPU's boost clock approaches parity despite its enormous scale.

The Verdict

The recorded data provides no benchmark scores, so a direct performance verdict cannot be derived from measurements. What the specifications show is a clear functional separation. The RTX PRO 4500 Blackwell Workstation is a dual-slot PCIe 5.0 x16 card with 4x DisplayPort 2.1b outputs, a 200 W TDP, and a suggested PSU of 550 W. It targets conventional workstation graphics, rendering, and display-driven tasks where pixel throughput and ROP count matter.

The NVIDIA Rubin GPU is an SXM module with no display outputs, a 2300 W TDP, and a suggested PSU of 2700 W. Its 288 GB HBM4 memory and 22.1 TB/s bandwidth position it for server-class compute workloads, not desktop or workstation visualization. The absence of DirectX, OpenGL, and Vulkan API support on the Rubin GPU further confirms it is not designed for graphics-centric applications. The RTX PRO 4500 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

From the data, the RTX PRO 4500 is the only viable option for tasks requiring display output, graphics APIs, or high pixel fill rates. The Rubin GPU is the only option for massive memory capacity, extreme FP16 throughput, and memory bandwidth beyond anything the workstation card offers. Users needing a physical card that fits a standard slot and outputs video have exactly one choice. Users needing maximum compute density in a server chassis have the other.

Neither product has a launch MSRP listed in the database, so no cost comparison is possible. The production status for both is listed as Active, and the RTX PRO 4500 has a release date of March 17, 2025, while the Rubin GPU lists December 31, 2025.

Where Each One Wins

The RTX PRO 4500 Blackwell Workstation wins in pixel rate, ROP count, base clock, display connectivity, API compatibility, and physical form factor. Its 269.6 GPixel/s pixel rate is nearly five times higher than the Rubin GPU's 54.41 GPixel/s. The 112 ROPs versus 24 ROPs directly supports this fill-rate advantage. The workstation card outputs 4x DisplayPort 2.1b, while the Rubin GPU has no outputs. The RTX PRO 4500 also supports the full graphics API stack, making it suitable for any software that relies on DirectX, OpenGL, or Vulkan.

The Rubin GPU wins in every compute-heavy metric. Its FP32 throughput of 130.0 TFLOPS is 2.57 times the workstation's 50.53 TFLOPS. FP16 performance of 260.0 TFLOPS is 5.15 times higher. Memory bandwidth of 22.1 TB/s is 24.66 times higher. Memory capacity of 288 GB is 9 times larger than 32 GB. Texture rate of 2,031.2 GTexel/s is 2.57 times higher. The Rubin GPU also uses a 3 nm process node versus the 5 nm node of the RTX PRO 4500, and it connects via PCIe 6.0 x16 rather than PCIe 5.0 x16.

The RTX PRO 4500 has a 200 W TDP and fits a dual-slot form factor with a 267 mm length, 111 mm height, and 40 mm width. The Rubin GPU consumes 2300 W and comes as an SXM module with no listed dimensions. The workstation card uses a single 16-pin power connector, while the Rubin GPU lists no power connectors, consistent with a server module powered through its socket.

For memory type, the RTX PRO 4500 uses GDDR7, while the Rubin GPU uses HBM4. The workstation's 256-bit bus is narrow compared to the Rubin GPU's 16384-bit bus. These architectural choices align with the respective target markets: graphics workstations prioritize latency, display output, and moderate power envelopes; server accelerators prioritize capacity, bandwidth, and raw compute.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The NVIDIA Rubin GPU delivers 130.0 TFLOPS of FP32, which is 2.57 times the 50.53 TFLOPS of the RTX PRO 4500 Blackwell Workstation.

Q: How much memory bandwidth does each GPU provide?

A: The RTX PRO 4500 offers 896.0 GB/s from 32 GB of GDDR7 on a 256-bit bus. The Rubin GPU provides 22.1 TB/s from 288 GB of HBM4 on a 16384-bit bus, a 24.66-fold bandwidth advantage.

Q: Can the NVIDIA Rubin GPU drive displays?

A: No. The Rubin GPU lists "No outputs" for display outputs and has no DirectX, OpenGL, or Vulkan API support. The RTX PRO 4500 has 4x DisplayPort 2.1b outputs and supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: What is the pixel fill rate difference?

A: The RTX PRO 4500 achieves 269.6 GPixel/s with 112 ROPs, while the Rubin GPU reaches 54.41 GPixel/s with 24 ROPs. The workstation card has a 4.95-fold higher pixel rate.

Q: How do the transistor counts compare?

A: The RTX PRO 4500 has 45,600 million transistors on a 378 mm² die. The Rubin GPU has 336,000 million transistors on a 1456 mm² die, which is 7.37 times more transistors on a 3.85 times larger die.

Q: What are the power requirements?

A: The RTX PRO 4500 has a 200 W TDP with a suggested PSU of 550 W and uses one 16-pin power connector. The Rubin GPU has a 2300 W TDP with a suggested PSU of 2700 W and lists no power connectors, consistent with an SXM module.

Architecture Differences

The RTX PRO 4500 Blackwell Workstation uses the GB203 chip built on the Blackwell 2.0 architecture, fabricated on a 5 nm process at TSMC. The Rubin GPU uses the GR100 chip on the Rubin architecture, fabricated on a 3 nm process, also at TSMC. The process node difference gives the Rubin GPU a transistor density of 230.8 million transistors per square millimeter, compared to 120.6 million for the RTX PRO 4500.

The RTX PRO 4500 belongs to the Blackwell PRO W (x000) generation, while the Rubin GPU belongs to the Server Rubin (Rxx) generation. The workstation card's predecessor is listed as Workstation Ada, and the Rubin GPU's predecessor is Server Blackwell. Both have no listed successor.

Memory architecture diverges completely. The RTX PRO 4500 uses 32 GB of GDDR7 with a 256-bit bus and 896.0 GB/s bandwidth. The Rubin GPU uses 288 GB of HBM4 with a 16384-bit bus and 22.1 TB/s bandwidth. The workstation card has a memory clock of 1750 MHz with 28 Gbps effective speed; the Rubin GPU has a memory clock of 2695 MHz with 10.8 Gbps effective speed.

Compute resources differ by design. The RTX PRO 4500 has 10,496 shading units, 328 TMUs, 112 ROPs, 82 RT cores, and 328 tensor cores. The Rubin GPU has 28,672 shading units, 896 TMUs, 24 ROPs, no listed RT cores, and 896 tensor cores. The workstation card supports FP16 at a 1:1 ratio with FP32, while the Rubin GPU supports FP16 at a 2:1 ratio, doubling its FP16 throughput relative to FP32.

The RTX PRO 4500 has a base clock of 1635 MHz and a boost clock of 2407 MHz. The Rubin GPU has a base clock of 700 MHz and a boost clock of 2267 MHz. The workstation card's base clock is 2.34 times higher, while the boost clocks are within 5.8% of each other.

Interface and physical specifications also separate the two. The RTX PRO 4500 uses PCIe 5.0 x16, has a dual-slot form factor, measures 267 mm by 111 mm by 40 mm, uses one 16-pin power connector, and has a 200 W TDP. The Rubin GPU uses PCIe 6.0 x16, comes as an SXM module with no listed dimensions, lists no power connectors, and has a 2300 W TDP. The workstation card has 4x DisplayPort 2.1b outputs; the Rubin GPU has no outputs. The RTX PRO 4500 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4; the Rubin GPU lists N/A for all three APIs.