AMD Radeon Pro W6800X Duo vs NVIDIA RTX A5500 Comparison

The NVIDIA RTX A5500 and AMD Radeon Pro W6800X Duo are both end-of-life workstation flagships, but they target different ecosystems and deliver very different benchmark results. The data shows a clear performance gap in cross-platform tests, with the NVIDIA card leading by substantial margins. The RTX A5500 achieves an average benchmark score of 165,217, placing it in the 97th percentile of all GPUs, while the W6800X Duo averages 135,774, landing in the 96th percentile. The head-to-head comparison reveals a 40.5% advantage for the A5500 in Geekbench OpenCL and a 24% lead in Vulkan, making the performance hierarchy straightforward despite the AMD card's dual-GPU design.

Head-to-Head Benchmarks

The most decisive victory for the NVIDIA RTX A5500 comes in the Geekbench OpenCL test, where it scores 174,637 against the W6800X Duo's 124,335. That is a 40.5% difference, a massive gap that cannot be explained by minor architectural tweaks. The A5500's raw FP32 throughput of 34.10 TFLOPS versus the AMD card's 15.11 TFLOPS more than doubles the compute capacity, and the OpenCL result reflects that disparity almost directly.

Vulkan performance tells a similar story, though with a narrower margin. The RTX A5500 posts 155,797 while the W6800X Duo manages 125,622, a 24% delta. This suggests that while the AMD card is relatively stronger in Vulkan than in OpenCL, it still trails the NVIDIA card by a significant amount. The A5500's 80 RT cores and 320 Tensor Cores likely contribute to its advantage in modern graphics workloads, as the W6800X Duo has 60 RT cores and no Tensor Cores at all.

Looking at the broader competitive landscape, the RTX A5500's average score of 165,217 sits just 0.2% above the AMD Radeon PRO W7800 (164,894) and 0.5% below the NVIDIA RTX 4500 Ada Generation (166,094). The W6800X Duo's average of 135,774 is nearly identical to the AMD Radeon PRO W6800 (135,396, a 0.3% delta) and the NVIDIA A10M (135,230, a 0.4% delta). In other words, the W6800X Duo performs like a mid-range workstation card despite its "Duo" dual-GPU branding, while the A5500 competes with much newer hardware.

The wins tally confirms the direction: the RTX A5500 takes 2 wins out of 2 head-to-head tests, while the W6800X Duo has 0. When interpreting these numbers, note that the AMD card's best result is in Geekbench Metal (157,365), a test the NVIDIA card does not have a comparable score for. On common ground, the NVIDIA card is simply faster.

Architecture Differences

The underlying silicon tells a tale of two very different design philosophies. The RTX A5500 uses NVIDIA's GA102 chip built on an 8 nm Samsung process, with 28,300 million transistors packed into a 628 mm² die. That yields a transistor density of 45.1 million per square millimeter. In contrast, the W6800X Duo uses AMD's Navi 21 on a 7 nm TSMC process, with 26,800 million transistors on a 520 mm² die, achieving a higher density of 51.5 million per square millimeter. The AMD chip is more efficient per square millimeter, but that does not translate into performance wins here.

The compute configurations are radically different. The A5500 fields 10,240 shading units, 320 TMUs, and 96 ROPs, alongside 80 RT cores and 320 Tensor Cores. The W6800X Duo, despite its dual-GPU nature, has only 3,840 shading units, 240 TMUs, and 96 ROPs per GPU, with 60 RT cores and no Tensor Cores. This is a fundamental design split: the A5500 is a single large GPU with massive compute throughput, while the W6800X Duo appears to be two smaller GPUs that the benchmarks treat as one unit.

Memory configurations differ substantially. The A5500 offers 24 GB of GDDR6 on a 384-bit bus, delivering 768.0 GB/s of bandwidth. The W6800X Duo has 32 GB of GDDR6 on a 256-bit bus, but only 512.0 GB/s of bandwidth. Despite having more capacity, the AMD card's narrower bus reduces its memory bandwidth by 33%, which likely hurts in bandwidth-hungry workloads like ray tracing or large texture streaming. Both cards run memory at 2000 MHz with 16 Gbps effective speed, but the bus width advantage belongs to NVIDIA.

Clock speeds favor AMD on paper. The W6800X Duo runs at a base of 1800 MHz and boosts to 1967 MHz, while the A5500 sits at 1080 MHz base and 1665 MHz boost. However, the A5500's much higher shading unit count overcomes the clock deficit, resulting in a pixel rate of 159.8 GPixel/s versus the AMD card's 188.8 GPixel/s. The AMD card wins on pixel fill rate, but the A5500 dominates texture rate at 532.8 GTexel/s versus 472.1 GTexel/s.

Power and physical specifications also diverge sharply. The A5500 draws 230 W TDP with a single 8-pin connector and a suggested 550 W PSU, fitting in a dual-slot form factor. The W6800X Duo demands 400 W TDP, requires an 800 W PSU, and occupies a quad-slot design. It also uses the Apple MPX bus interface rather than standard PCIe, with display outputs limited to 1x HDMI 2.1 and 4x Thunderbolt, whereas the A5500 offers 4x DisplayPort 1.4a over PCIe 4.0 x16.

The Verdict

The benchmark data is unambiguous: the NVIDIA RTX A5500 is the faster card in every shared test. A 40.5% lead in OpenCL and a 24% lead in Vulkan represent enormous performance gaps that no software optimization could realistically close. The A5500's 34.10 TFLOPS FP32 throughput against the W6800X Duo's 15.11 TFLOPS makes it nearly twice as powerful for compute-heavy tasks, and its 768.0 GB/s memory bandwidth versus 512.0 GB/s gives it a clear edge in data-intensive workflows.

The W6800X Duo does have advantages in specific areas. It offers more VRAM at 32 GB versus 24 GB, which matters for extremely large datasets that exceed the A5500's capacity. It also has higher clock speeds and a better pixel rate, which could benefit certain rasterization workloads. Its Metal score of 157,365 is strong, and for users locked into a Mac-based workflow via Apple MPX, it may be the only option that fits.

However, the RTX A5500 sits in the 97th percentile of all GPUs, while the W6800X Duo rests at the 96th percentile. The A5500's nearest rivals include the RTX 4500 Ada Generation (-0.5% delta) and the A100 PCIe 40 GB (1.7% delta), indicating it competes with modern and enterprise-grade hardware. The W6800X Duo's rivals are the PRO W6800 (0.3% delta) and the A10M (0.4% delta), which are mid-range workstation cards.

For professional users choosing between these two, the data points to the RTX A5500 unless the specific requirements demand AMD's larger memory pool or Mac compatibility. The A5500's performance headroom in OpenCL and Vulkan makes it the more versatile choice for cross-platform compute, while the W6800X Duo's appeal is limited to its niche ecosystem and higher VRAM capacity.

FAQ

Q: Which card has a higher average benchmark score?

A: The NVIDIA RTX A5500 averages 165,217, which is 29,443 points higher than the AMD Radeon Pro W6800X Duo's 135,774. The A5500 ranks in the 97th percentile of all GPUs, while the W6800X Duo ranks in the 96th.

Q: How much faster is the RTX A5500 in OpenCL?

A: The RTX A5500 scores 174,637 in Geekbench OpenCL versus the W6800X Duo's 124,335, a 40.5% advantage. This is the largest single-test gap between the two cards.

Q: Does the W6800X Duo have any benchmark where it beats the A5500?

A: The head-to-head data shows the RTX A5500 winning both shared tests (OpenCL and Vulkan). The W6800X Duo has a Geekbench Metal score of 157,365, but the A5500 has no comparable Metal result in the data.

Q: What is the memory bandwidth difference?

A: The RTX A5500 provides 768.0 GB/s over a 384-bit bus, while the W6800X Duo provides 512.0 GB/s over a 256-bit bus. The A5500 has 33% more bandwidth despite having 8 GB less VRAM (24 GB vs 32 GB).

Q: How do the TDPs compare?

A: The RTX A5500 has a 230 W TDP with a suggested 550 W PSU, while the W6800X Duo has a 400 W TDP with a suggested 800 W PSU. The AMD card requires nearly double the power budget.

Q: Which card is better for a Mac Pro system?

A: The W6800X Duo uses the Apple MPX bus interface and outputs 1x HDMI 2.1 plus 4x Thunderbolt, making it designed for Macs. The RTX A5500 uses PCIe 4.0 x16 and 4x DisplayPort 1.4a, which is a standard workstation configuration.

Where Each One Wins

The NVIDIA RTX A5500 wins in raw compute performance, which is the dominant factor for most professional workloads. Its 34.10 TFLOPS FP32 throughput crushes the W6800X Duo's 15.11 TFLOPS, making it the clear choice for GPU-accelerated rendering, simulation, and AI inference where Tensor Cores are available. The 768.0 GB/s memory bandwidth also gives it a decisive edge in tasks that stream large textures or datasets, such as 8K video editing or complex 3D scene composition. Its dual-slot form factor and single 8-pin power connector make it far easier to integrate into standard PC workstations, and its 230 W TDP means lower operating costs and simpler cooling requirements.

The AMD Radeon Pro W6800X Duo wins in memory capacity and specific platform compatibility. With 32 GB of VRAM, it can hold larger models or datasets than the A5500's 24 GB, which is critical for workloads that exceed the NVIDIA card's memory ceiling. Its higher base clock of 1800 MHz and boost of 1967 MHz, combined with a pixel rate of 188.8 GPixel/s, give it an edge in certain fill-rate-limited scenarios. The Metal score of 157,365 suggests strong performance in Apple's graphics API. For Mac Pro users, the Apple MPX interface and Thunderbolt outputs are non-negotiable, making the W6800X Duo the only viable option in this comparison despite its lower raw scores.

Specification Differences

| Specification | NVIDIA RTX A5500 | AMD Radeon Pro W6800X Duo |

|----------------|------------------|----------------------------|

| Process Node | 8 nm (Samsung) | 7 nm (TSMC) |

| Transistors | 28,300 million | 26,800 million |

| Die Size | 628 mm² | 520 mm² |

| Transistor Density | 45.1M / mm² | 51.5M / mm² |

| Base Clock | 1080 MHz | 1800 MHz |

| Boost Clock | 1665 MHz | 1967 MHz |

| FP32 Performance | 34.10 TFLOPS | 15.11 TFLOPS |

| FP16 Performance | 34.10 TFLOPS (1:1) | 30.21 TFLOPS (2:1) |

| Memory Size | 24 GB GDDR6 | 32 GB GDDR6 |

| Memory Bus Width | 384 bit | 256 bit |

| Memory Bandwidth | 768.0 GB/s | 512.0 GB/s |

| Shading Units | 10,240 | 3,840 |

| TMUs | 320 | 240 |

| ROPs | 96 | 96 |

| RT Cores | 80 | 60 |

| Tensor Cores | 320 | None |

| Pixel Rate | 159.8 GPixel/s | 188.8 GPixel/s |

| Texture Rate | 532.8 GTexel/s | 472.1 GTexel/s |

| TDP | 230 W | 400 W |

| Slot Width | Dual-slot | Quad-slot |

| Suggested PSU | 550 W | 800 W |

| Bus Interface | PCIe 4.0 x16 | Apple MPX |

| Display Outputs | 4x DisplayPort 1.4a | 1x HDMI 2.1, 4x Thunderbolt |

| Launch MSRP | Not available | 4,999 USD |

| Release Date | 2022-03-21 | 2021-08-02 |