NVIDIA RTX A400 vs NVIDIA RTX PRO 4500 Blackwell Server Comparison

Where Each One Wins

The benchmark data presents an unusual split: the NVIDIA RTX A400 has a full suite of recorded measurements, while the NVIDIA RTX PRO 4500 Blackwell Server has no benchmark entries in the database at this time. This means the use-case comparison must be drawn primarily from the architectural and specification records rather than direct performance scores.

The RTX A400 delivers measurable results across nine distinct tests. Its strongest showing in the database is the Geekbench OpenCL score of 22,844, followed closely by Geekbench Vulkan at 22,237. These compute-oriented results indicate the card handles general-purpose GPU workloads with reasonable efficiency for its class. The Passmark G3D score of 5,983 places it in a modest performance tier, while the Passmark GPU Compute score of 2,557 shows more limited raw compute throughput. Legacy DirectX tests reveal a mixed profile: DirectX 9 scores 87, DirectX 11 scores 37, DirectX 10 scores 32, and DirectX 12 scores 27. The 2D graphics score of 899 suggests basic desktop and display capabilities remain functional.

The RTX PRO 4500 Blackwell Server, by contrast, has no recorded benchmark scores, no average score, and no nearest rivals listed. Its percentile rank against all GPUs is 50, which sits at the median of the database distribution, but this figure is not backed by any measured performance data. The absence of results means the database cannot currently confirm where this card wins in real-world testing. What the specification record does show is a device engineered for server deployment: it has no display outputs, uses a single 16-pin power connector, and requires a 450 W suggested power supply.

The A400 wins in the category of verified, measured performance. Every benchmark score attributed to it comes from actual testing. The PRO 4500 wins in the category of raw specification headroom, with figures that suggest substantial capability, but those capabilities remain unverified in the database. For any workload where confirmed performance matters, the A400 is the only option with data behind it. For workloads where theoretical specifications are the deciding factor, the PRO 4500 appears positioned to dominate, but the numbers cannot confirm this.

Architecture Differences

The two GPUs come from different manufacturing processes and foundries. The RTX A400 uses the GA107 chip built on an 8 nm Samsung process, containing 8,700 million transistors on a 200 mm² die. The transistor density calculates to 43.5 million per square millimeter. The RTX PRO 4500 Blackwell Server uses the GB203 chip fabricated on a 5 nm TSMC process, packing 45,600 million transistors into a 378 mm² die, yielding a density of 120.6 million per square millimeter. The PRO 4500 has over five times the transistor count and more than triple the density, indicating a fundamentally more complex design.

Architecture generations differ entirely. The A400 belongs to the Ampere architecture, part of the Workstation Ampere (Ax000) generation. The PRO 4500 uses Blackwell 2.0 architecture from the Server Blackwell (Bxx) generation. This generational gap shows in the feature sets and compute capabilities. The A400 includes 768 shading units, 24 texture mapping units, and 16 raster operation units. It has 6 ray tracing cores and 24 tensor cores. The PRO 4500 scales this dramatically: 10,496 shading units, 328 TMUs, 112 ROPs, 82 RT cores, and 328 tensor cores.

Clock behavior also differs. The A400 has a base clock of 1417 MHz and a boost clock of 1762 MHz. The PRO 4500 starts lower at 1215 MHz but boosts much higher to 2415 MHz. The lower base clock with the higher boost suggests aggressive thermal management in the server design, while the A400 maintains a tighter clock range.

Memory architecture shows a complete divergence. The A400 uses 4 GB of GDDR6 on a 64-bit bus, producing 96.00 GB/s of bandwidth. Memory runs at 1500 MHz with 12 Gbps effective speed. The PRO 4500 uses 32 GB of GDDR7 on a 256-bit bus, delivering 800.3 GB/s of bandwidth. Memory runs at 1563 MHz with 25 Gbps effective speed. The PRO 4500 has eight times the memory capacity and more than eight times the bandwidth.

The A400 draws 50 W and uses no power connectors, relying on slot power alone. The PRO 4500 draws 165 W and requires a single 16-pin connector. Suggested power supply ratings are 250 W for the A400 and 450 W for the PRO 4500. Physical dimensions reflect the server orientation: the A400 measures 163 mm in length and 69 mm in height, while the PRO 4500 extends to 267 mm in length, 111 mm in height, and 40 mm in width. Both are single-slot cards.

FAQ

Q: Which GPU has more ray tracing cores?

A: The RTX PRO 4500 Blackwell Server has 82 ray tracing cores, while the RTX A400 has 6. This represents a substantial difference in hardware-accelerated ray tracing capability.

Q: How do the memory capacities compare?

A: The RTX A400 has 4 GB of GDDR6 memory on a 64-bit bus, while the RTX PRO 4500 Blackwell Server has 32 GB of GDDR7 memory on a 256-bit bus. The bandwidth figures are 96.00 GB/s for the A400 and 800.3 GB/s for the PRO 4500.

Q: What is the transistor count difference?

A: The RTX A400 contains 8,700 million transistors on a 200 mm² die using an 8 nm Samsung process. The RTX PRO 4500 Blackwell Server contains 45,600 million transistors on a 378 mm² die using a 5 nm TSMC process.

Q: Do both cards support the same graphics APIs?

A: Yes, both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The API support is identical between the two cards.

Q: Which card has display outputs?

A: The RTX A400 has 4x mini-DisplayPort 1.4a outputs. The RTX PRO 4500 Blackwell Server has no display outputs, reflecting its server-oriented design.

Q: What are the power requirements?

A: The RTX A400 has a 50 W TDP with no power connectors and a suggested 250 W power supply. The RTX PRO 4500 Blackwell Server has a 165 W TDP, uses one 16-pin connector, and requires a suggested 450 W power supply.

Specification Differences

The specification table shows every field where the two cards differ. Process node: 8 nm Samsung versus 5 nm TSMC. Transistors: 8,700 million versus 45,600 million. Die size: 200 mm² versus 378 mm². Transistor density: 43.5M per mm² versus 120.6M per mm².

Clock speeds: base 1417 MHz versus 1215 MHz, boost 1762 MHz versus 2415 MHz, memory 1500 MHz at 12 Gbps effective versus 1563 MHz at 25 Gbps effective.

Memory: 4 GB GDDR6 versus 32 GB GDDR7, 64-bit bus versus 256-bit bus, 96.00 GB/s versus 800.3 GB/s bandwidth.

Compute resources: 768 shading units versus 10,496, 24 TMUs versus 328, 16 ROPs versus 112, 6 RT cores versus 82, 24 tensor cores versus 328.

Rates: pixel rate 28.19 GPixel/s versus 270.5 GPixel/s, texture rate 42.29 GTexel/s versus 792.1 GTexel/s, FP32 2.706 TFLOPS versus 50.70 TFLOPS, FP16 2.706 TFLOPS versus 50.70 TFLOPS.

Power: 50 W versus 165 W TDP, no connectors versus one 16-pin, 250 W versus 450 W suggested PSU.

Bus interface: PCIe 4.0 x8 versus PCIe 5.0 x16.

Display outputs: 4x mini-DisplayPort 1.4a versus no outputs.

Dimensions: 163 mm by 69 mm versus 267 mm by 111 mm by 40 mm.

Release dates: the A400 launched on 2024-04-15, while the PRO 4500 has a release date of 2026-03-16.

Architecture and generation: Ampere from Workstation Ampere (Ax000) versus Blackwell 2.0 from Server Blackwell (Bxx). Chip identifiers: GA107 versus GB203.

Head-to-Head Benchmarks

The database contains no head-to-head benchmark entries for these two GPUs. The wins counters show zero for both cards. Without direct comparison results, the performance relationship must be inferred from the separate specification records and the A400's measured scores.

The A400's best measured score is 22,844 in Geekbench OpenCL. Its Vulkan score of 22,237 is nearly as high. These figures place the card in the 35th percentile of all GPUs in the database. Its average benchmark score is 6,078, with nearest rivals including the NVIDIA GeForce MX230 at 6,077 (0% delta), the NVIDIA Quadro P2000 at 6,049 (0.5% delta), the Intel Iris Pro Graphics 6200 at 6,117 (-0.6% delta), and the AMD Radeon 760M at 6,019 (1% delta). The A400 sits essentially at parity with these four cards, none of which represent high-end workstation performance.

The PRO 4500 has an average benchmark score of 0 and a percentile rank of 50. The percentile figure suggests it would sit at the median of the database, but this is not supported by any measured scores. The FP32 compute rate of 50.70 TFLOPS is more than 18 times the A400's 2.706 TFLOPS. The texture rate of 792.1 GTexel/s is over 18 times the A400's 42.29 GTexel/s. The pixel rate of 270.5 GPixel/s is nearly ten times the A400's 28.19 GPixel/s.

These specification gaps are enormous. The PRO 4500's shading unit count of 10,496 is roughly 13.7 times the A400's 768. The memory bandwidth of 800.3 GB/s is roughly 8.3 times the A400's 96.00 GB/s. The boost clock of 2415 MHz exceeds the A400's 1762 MHz by 653 MHz. The transistor density difference is nearly threefold.

The database cannot confirm how these specification advantages translate into benchmark scores because the PRO 4500 has no recorded results. The A400's scores are all verified, but they reflect a low-end card. The PRO 4500's specifications indicate a much higher performance class, but the absence of measurements leaves the actual margin unquantified.

The Verdict

The data supports two distinct conclusions depending on what the user prioritizes. For verified, measured performance, the RTX A400 is the only choice with any benchmark evidence. Its scores span nine tests, covering compute, graphics, and legacy APIs. The card works, it has been tested, and the results are recorded. It is also the only card with display outputs, making it suitable for any workload requiring visual output.

For raw specification headroom, the RTX PRO 4500 Blackwell Server dominates every measurable parameter. It has more shading units, more TMUs, more ROPs, more RT cores, more tensor cores, more memory, more bandwidth, higher boost clocks, and a newer manufacturing process. The FP32 compute rate alone is 50.70 TFLOPS versus 2.706 TFLOPS. The memory capacity is 32 GB versus 4 GB. The bandwidth is 800.3 GB/s versus 96.00 GB/s. These are not marginal differences; they represent different performance classes entirely.

The PRO 4500's lack of display outputs and server-oriented design point to headless compute deployments. The A400's mini-DisplayPort outputs and low 50 W power draw suggest desktop or small-form-factor use. The release date difference, with the A400 from 2024 and the PRO 4500 from 2026, also indicates the PRO 4500 belongs to a newer product wave.

The percentile ranks tell a partial story. The A400 sits at the 35th percentile of all GPUs, placing it below the median. The PRO 4500 sits at the 50th percentile, exactly at the median, but this figure has no benchmark support. The database records no nearest rivals for the PRO 4500, meaning no comparison points exist. The A400 has four nearest rivals, all within roughly one percentage point of its average score.

The choice comes down to whether the user trusts measured data or specification data. The A400 offers confirmed but modest performance. The PRO 4500 offers unconfirmed but massive specification advantages. For any workload where the specifications matter, such as large memory footprints or high compute throughput, the PRO 4500 appears positioned to deliver. For any workload requiring verified performance or display output, the A400 is the only option with supporting data.