NVIDIA RTX A400 vs NVIDIA RTX PRO 5000 72 GB Blackwell Comparison

The NVIDIA RTX PRO 5000 72 GB Blackwell and the NVIDIA RTX A400 represent two vastly different tiers of professional workstation graphics. The data shows a stark performance chasm between them, with the Blackwell card winning all seven head-to-head benchmark comparisons. This analysis breaks down the measured performance gaps, architectural differences, and use-case implications based strictly on the benchmark and specification data provided.

Head-to-Head Benchmarks

The benchmark results are unambiguous: the RTX PRO 5000 72 GB Blackwell outperforms the RTX A400 in every single tested discipline, with margins ranging from marginal to overwhelming. The smallest gap appears in the 2D graphics test (passmark_g2d), where the RTX PRO 5000 scores 914 against the RTX A400's 899, a delta of just 1.7%. This near-parity in 2D performance suggests that basic desktop compositing and 2D workloads do not meaningfully differentiate these two cards.

Moving into 3D and compute workloads, the separation becomes dramatic. In the DirectX 12 test (passmark_directx_12), the RTX PRO 5000 delivers a score of 78 versus 27 for the RTX A400, representing a 188.9% advantage. The DirectX 9 test shows an even wider relative gap, with the RTX PRO 5000 scoring 311 against 87, a 257.5% lead. DirectX 10 results show the RTX PRO 5000 at 175 versus 32, a 446.9% margin, while DirectX 11 sees the RTX PRO 5000 at 219 versus 37, a 491.9% advantage.

The most significant deltas appear in the broader GPU performance metrics. In the passmark_g3d test, which aggregates overall 3D rendering capability, the RTX PRO 5000 scores 24,310 against the RTX A400's 5,983 — a 306.3% lead. The compute-oriented passmark_gpu_compute test shows the largest relative difference: the RTX PRO 5000 reaches 15,667 while the RTX A400 manages only 2,557, yielding a 512.7% advantage. These figures indicate that the RTX PRO 5000 is not merely faster but operates in a completely different performance class for heavy 3D and compute tasks.

Cross-referencing with the average benchmark scores reinforces this hierarchy. The RTX PRO 5000 has an average benchmark score of 6,407, placing it in the 37th percentile of all GPUs. Its nearest rivals include the NVIDIA GeForce GTX 460 SE and GTX 580M, both at 6,389 (0.3% delta), and the AMD Radeon Vega 10 Mobile at 6,476 (-1.1% delta). The RTX A400, with an average score of 6,078, sits at the 35th percentile, with nearest rivals including the NVIDIA GeForce MX230 at 6,077 (0% delta) and the NVIDIA Quadro P2000 at 6,049 (0.5% delta). Notably, despite the RTX A400's vastly lower raw performance, its average score is only about 5% below the RTX PRO 5000's average, because the averaging methodology smooths out the extreme differences seen in the individual DirectX tests.

Architecture Differences

The two GPUs are built on fundamentally different architectures and fabrication processes. The RTX PRO 5000 uses the GB202 chip based on the Blackwell 2.0 architecture, manufactured on a 5 nm process at TSMC. The RTX A400 uses the GA107 chip based on the older Ampere architecture, manufactured on an 8 nm process at Samsung. This process difference alone contributes significantly to the performance and efficiency gap.

The scale of the silicon disparity is immense. The RTX PRO 5000 packs 92,200 million transistors on a 750 mm² die, achieving a transistor density of 122.9 million per mm². The RTX A400 contains just 8,700 million transistors on a 200 mm² die, with a density of 43.5 million per mm². This represents a 10.6x difference in transistor count and a 3.75x difference in die area, explaining the RTX PRO 5000's ability to house vastly more processing resources.

Core configurations differ by an order of magnitude or more. The RTX PRO 5000 features 14,080 shading units, 440 texture mapping units (TMUs), and 160 render output units (ROPs). The RTX A400 has 768 shading units, 24 TMUs, and 16 ROPs. For ray tracing, the RTX PRO 5000 includes 110 RT cores versus 6 on the RTX A400, and for AI acceleration, it has 440 tensor cores versus 24. These figures translate directly into throughput: the RTX PRO 5000 achieves 66.94 TFLOPS FP32 performance, while the RTX A400 manages just 2.706 TFLOPS — a 24.7x difference in raw compute throughput.

Memory architecture further separates the two. The RTX PRO 5000 uses 72 GB of GDDR7 memory on a 384-bit bus, delivering 1.34 TB/s of bandwidth. The RTX A400 has 4 GB of GDDR6 on a 64-bit bus, providing 96.00 GB/s. Clock speeds also differ, with the RTX PRO 5000 running at 1740 MHz base and 2377 MHz boost, while the RTX A400 runs at 1417 MHz base and 1762 MHz boost. The memory clocks are similarly disparate: 1750 MHz (28 Gbps effective) for the RTX PRO 5000 versus 1500 MHz (12 Gbps effective) for the RTX A400.

The physical and power profiles reflect these architectural differences. The RTX PRO 5000 is a dual-slot card measuring 267 mm in length, 111 mm in height, and 40 mm in width, with a 300 W TDP and a 1x 16-pin power connector, requiring a 700 W suggested PSU. The RTX A400 is a single-slot card at 163 mm length and 69 mm height, with a 50 W TDP, no power connector, and a 250 W suggested PSU. The RTX PRO 5000 uses a PCIe 5.0 x16 interface and outputs 4x DisplayPort 2.1b, while the RTX A400 uses PCIe 4.0 x8 and outputs 4x mini-DisplayPort 1.4a.

FAQ

Q: Which GPU has better raw compute performance?

A: The NVIDIA RTX PRO 5000 72 GB Blackwell achieves 66.94 TFLOPS FP32, compared to 2.706 TFLOPS for the NVIDIA RTX A400. In the passmark_gpu_compute benchmark, the RTX PRO 5000 scores 15,667 versus 2,557, a 512.7% advantage.

Q: How do the memory configurations compare?

A: The RTX PRO 5000 has 72 GB of GDDR7 on a 384-bit bus with 1.34 TB/s bandwidth. The RTX A400 has 4 GB of GDDR6 on a 64-bit bus with 96.00 GB/s bandwidth. The RTX PRO 5000 offers 18x more capacity and roughly 14x more bandwidth.

Q: What is the performance difference in DirectX 11 workloads?

A: In the passmark_directx_11 test, the RTX PRO 5000 scores 219 against 37 for the RTX A400, representing a 491.9% lead — the second-largest relative gap across all benchmarks.

Q: Are there any benchmarks where the RTX A400 is competitive?

A: The closest result is in passmark_g2d, where the RTX PRO 5000 scores 914 versus 899, a 1.7% margin. The RTX A400 loses all other head-to-head benchmarks by margins ranging from 188.9% to 512.7%.

Q: What are the power and physical requirements of each card?

A: The RTX PRO 5000 has a 300 W TDP, requires a 700 W PSU, uses a 1x 16-pin connector, and is dual-slot. The RTX A400 has a 50 W TDP, requires a 250 W PSU, uses no power connector, and is single-slot.

Q: How do their average benchmark scores and percentiles compare?

A: The RTX PRO 5000 has an average benchmark score of 6,407 (37th percentile), while the RTX A400 scores 6,078 (35th percentile). Despite the massive performance gap in individual tests, their averages are within 5% due to the averaging methodology.

The Verdict

The data supports a clear separation of roles. The NVIDIA RTX PRO 5000 72 GB Blackwell is engineered for high-end workstation workloads requiring massive memory capacity, extreme compute throughput, and advanced features like ray tracing and tensor acceleration. Its 72 GB GDDR7 memory and 66.94 TFLOPS FP32 performance make it suitable for large-scale 3D rendering, scientific compute, and AI inference tasks where the 512.7% compute advantage over the RTX A400 would be decisive.

The NVIDIA RTX A400, with its 4 GB GDDR6 memory and 2.706 TFLOPS, serves a fundamentally different purpose. Its 50 W TDP, single-slot design, and lack of power connector indicate a low-profile solution for basic workstation display output, light 2D/3D CAD, or multi-GPU configurations where space and power are constrained. The 1.7% difference in 2D performance shows that for basic desktop tasks, the RTX A400 is not meaningfully slower.

Choosing between them depends entirely on workload requirements. For users running compute-heavy, memory-intensive professional applications, the RTX PRO 5000's 306.3% lead in passmark_g3d and 512.7% lead in compute make it the only viable option. For users needing a compact, low-power card for standard workstation duties, the RTX A400's 2D parity and minimal power draw are sufficient, and its nearest rivals (GeForce MX230, Quadro P2000) confirm its entry-level positioning.

Specification Differences

The following specifications differ between the two cards, with all values taken directly from the data:

• Chip: GB202 (RTX PRO 5000) vs GA107 (RTX A400)
• Architecture: Blackwell 2.0 vs Ampere
• Process Node: 5 nm (TSMC) vs 8 nm (Samsung)
• Transistors: 92,200 million vs 8,700 million
• Die Size: 750 mm² vs 200 mm²
• Transistor Density: 122.9M / mm² vs 43.5M / mm²
• Base Clock: 1740 MHz vs 1417 MHz
• Boost Clock: 2377 MHz vs 1762 MHz
• Memory Clock: 1750 MHz (28 Gbps effective) vs 1500 MHz (12 Gbps effective)
• Memory Size: 72 GB vs 4 GB
• Memory Type: GDDR7 vs GDDR6
• Memory Bus: 384 bit vs 64 bit
• Memory Bandwidth: 1.34 TB/s vs 96.00 GB/s
• Shading Units: 14,080 vs 768
• TMUs: 440 vs 24
• ROPs: 160 vs 16
• RT Cores: 110 vs 6
• Tensor Cores: 440 vs 24
• Pixel Rate: 380.3 GPixel/s vs 28.19 GPixel/s
• Texture Rate: 1,045.9 GTexel/s vs 42.29 GTexel/s
• FP32 Performance: 66.94 TFLOPS vs 2.706 TFLOPS
• FP16 Performance: 66.94 TFLOPS vs 2.706 TFLOPS
• TDP: 300 W vs 50 W
• Slot Width: Dual-slot vs Single-slot
• Power Connectors: 1x 16-pin vs None
• Suggested PSU: 700 W vs 250 W
• Bus Interface: PCIe 5.0 x16 vs PCIe 4.0 x8
• Display Outputs: 4x DisplayPort 2.1b vs 4x mini-DisplayPort 1.4a
• Dimensions: 267 mm x 111 mm x 40 mm vs 163 mm x 69 mm (width not provided)
• Release Date: 2025-10-20 vs 2024-04-15

Where Each One Wins

The RTX PRO 5000 72 GB Blackwell wins every head-to-head benchmark, but the significance of each win varies by workload category. In DirectX 10, 11, and 12 tests, it maintains leads of 446.9%, 491.9%, and 188.9% respectively, indicating strong modern API performance. The DirectX 9 result (257.5% lead) shows backward compatibility is also markedly better. The 3D rendering aggregate (passmark_g3d) at 306.3% makes it the clear choice for demanding 3D applications.

The RTX A400's only competitive showing is in 2D graphics (passmark_g2d), where the 1.7% gap is negligible. This makes it suitable for basic workstation display, office productivity, and lightweight CAD viewing where 3D acceleration is not the bottleneck. Its 50 W TDP and single-slot form factor also give it a clear advantage in scenarios requiring low power consumption or dense multi-GPU installations without external power connectors.

For compute workloads, the RTX PRO 5000's 512.7% lead in passmark_gpu_compute, combined with its 24.7x FP32 throughput advantage, makes it the sole option for GPU compute, simulation, or machine learning training. The RTX A400's compute performance is closer to entry-level consumer integrated graphics, as indicated by its nearest rival being the Intel Iris Pro Graphics 6200, which sits only 0.6% above it in average score. The RTX PRO 5000's rivals, by contrast, include discrete desktop GPUs like the GeForce GTX 460 SE, reflecting its position in a much higher performance tier.