AMD Radeon Pro Duo vs AMD Radeon RX 6800 Comparison

The Verdict

The AMD Radeon Pro Duo and the AMD Radeon RX 6800 serve completely different purposes, and the benchmark data reflects that split. The Radeon Pro Duo is a professional-grade compute card from the GCN era, built for raw throughput in OpenCL workloads, while the RX 6800 is a modern consumer gaming GPU with far broader API support and higher rasterization throughput.

For compute-heavy professional workloads, specifically those leveraging OpenCL, the Radeon Pro Duo is the clear choice. Its Geekbench OpenCL score of 35,860 is 46.3% higher than the RX 6800's 24,508 in the same test. That is a massive margin, and it places the Pro Duo in the 80th percentile of all GPUs, compared to the RX 6800's 75th percentile.

For gaming, modern API support, and general graphics performance, the RX 6800 wins decisively. It supports DirectX 12 Ultimate (12_2), while the Pro Duo is limited to DirectX 12 (12_0). The RX 6800 also has Vulkan 1.4 support versus 1.2.170 on the Pro Duo, and it delivers a pixel rate of 202.1 GPixel/s, which is more than three times the Pro Duo's 64.0 GPixel/s. The RX 6800's 16.17 TFLOPS FP32 performance also dwarfs the Pro Duo's 8.192 TFLOPS.

The data indicates that anyone needing OpenCL compute performance for professional workloads should choose the Radeon Pro Duo, despite its age. Gamers and users needing modern graphics features, higher frame rates, or lower power consumption should pick the RX 6800. The RX 6800 also offers 16 GB of GDDR6 memory versus 4 GB of HBM on the Pro Duo, which is a critical advantage for modern textures and datasets.

Architecture Differences

The two cards are built on fundamentally different architectures, process nodes, and design philosophies. The Radeon Pro Duo uses the Capsaicin chip based on GCN 3.0 architecture, fabricated on TSMC's 28 nm process. The RX 6800 uses the Navi 21 chip based on RDNA 2.0 architecture, fabricated on TSMC's 7 nm process. This process shrink is substantial: the Pro Duo packs 8,900 million transistors on a 596 mm² die, while the RX 6800 fits 26,800 million transistors on a smaller 520 mm² die. The transistor density tells the story: the RX 6800 achieves 51.5M transistors per mm², versus 14.9M per mm² on the Pro Duo.

Memory architecture differs completely. The Pro Duo uses 4 GB of HBM with a 4096-bit bus, while the RX 6800 uses 16 GB of GDDR6 with a 256-bit bus. Despite the massive difference in bus width, both cards deliver exactly 512.0 GB/s of memory bandwidth. The effective memory speed is 1000 Mbps on the Pro Duo versus 16 Gbps on the RX 6800.

The RX 6800 includes 60 ray tracing cores, which the Pro Duo lacks entirely. Shading unit counts are close: 4096 on the Pro Duo versus 3840 on the RX 6800, but the RX 6800 has more ROPs (96 versus 64) and fewer TMUs (240 versus 256). The RX 6800 also supports FP16 at a 2:1 ratio, delivering 32.33 TFLOPS, while the Pro Duo's FP16 is 1:1 at 8.192 TFLOPS.

Power and interface differences are notable. The RX 6800 has a 250 W TDP and uses 2x 8-pin power connectors with a 600 W suggested PSU. The Pro Duo has a 350 W TDP, requires 3x 8-pin connectors and a 750 W PSU. The RX 6800 uses PCIe 4.0 x16, while the Pro Duo is limited to PCIe 3.0 x16. Display outputs also differ: the Pro Duo has 1x HDMI 1.4a and 3x DisplayPort 1.2, while the RX 6800 has 1x HDMI 2.1, 2x DisplayPort 1.4a, and 1x USB Type-C.

FAQ

Q: Which card has a higher OpenCL benchmark score?

A: The Radeon Pro Duo scores 35,860 in Geekbench OpenCL, which is 46.3% higher than the RX 6800's 24,508. This puts the Pro Duo in the 80th percentile of all GPUs, versus the 75th percentile for the RX 6800.

Q: Does the RX 6800 support ray tracing?

A: Yes, the RX 6800 includes 60 ray tracing cores, while the Radeon Pro Duo has no ray tracing cores at all. This is a significant architectural advantage for the newer card in modern games and applications.

Q: How do memory capacities compare between the two cards?

A: The RX 6800 has 16 GB of GDDR6 memory, while the Radeon Pro Duo has 4 GB of HBM. Both cards provide 512.0 GB/s of memory bandwidth, but the RX 6800's larger capacity is a major advantage for modern workloads.

Q: Which card has a higher pixel fill rate?

A: The RX 6800 delivers 202.1 GPixel/s, which is more than triple the Pro Duo's 64.0 GPixel/s. This indicates substantially better rasterization performance for the RX 6800.

Q: What is the launch MSRP of each card?

A: The Radeon Pro Duo has a launch MSRP of 1,499 USD, while the RX 6800 has a launch MSRP of 579 USD.

Q: How do the cards compare in the 3DMark Steel Nomad DX12 test?

A: Only the RX 6800 has a recorded score in this test, achieving 3,188. The Radeon Pro Duo has no score recorded for this benchmark, which is consistent with its lack of DirectX 12 Ultimate support.

Specification Differences

The two cards differ across nearly every major specification category. The most striking differences are in process node, transistor count, memory size, and feature support.

The RX 6800 uses a 7 nm process versus 28 nm on the Pro Duo. The RX 6800 has 26,800 million transistors versus 8,900 million on the Pro Duo, and a smaller die size of 520 mm² versus 596 mm². Transistor density is 51.5M/mm² on the RX 6800 versus 14.9M/mm² on the Pro Duo.

Clock speeds are only fully specified for the RX 6800, with a base clock of 1700 MHz, boost clock of 2105 MHz, and game clock of 1815 MHz. The Pro Duo's core clocks are not recorded in the database, but its memory clock is 500 MHz (1000 Mbps effective), while the RX 6800's memory runs at 2000 MHz (16 Gbps effective).

Memory configuration: 16 GB GDDR6 on a 256-bit bus for the RX 6800, versus 4 GB HBM on a 4096-bit bus for the Pro Duo. Both have 512.0 GB/s bandwidth.

Compute units differ: RX 6800 has 3840 shading units, 240 TMUs, 96 ROPs, and 60 RT cores. The Pro Duo has 4096 shading units, 256 TMUs, and 64 ROPs, with no RT cores. FP32 performance is 16.17 TFLOPS on the RX 6800 versus 8.192 TFLOPS on the Pro Duo. FP16 is 32.33 TFLOPS (2:1) on the RX 6800 versus 8.192 TFLOPS (1:1) on the Pro Duo.

Power requirements: RX 6800 has 250 W TDP, 2x 8-pin connectors, and a 600 W suggested PSU. The Pro Duo has 350 W TDP, 3x 8-pin connectors, and a 750 W suggested PSU. Both are dual-slot cards, but the RX 6800 is shorter at 267 mm versus 277 mm for the Pro Duo.

API support: RX 6800 supports DirectX 12 Ultimate (12_2) and Vulkan 1.4, while the Pro Duo supports DirectX 12 (12_0) and Vulkan 1.2.170. Both support OpenGL 4.6. The RX 6800 uses PCIe 4.0 x16, the Pro Duo uses PCIe 3.0 x16.

Head-to-Head Benchmarks

The database contains one direct head-to-head benchmark between these two cards: Geekbench OpenCL. The Radeon Pro Duo wins this test with a score of 35,860, versus 24,508 for the RX 6800. That is a 46.3% advantage for the Pro Duo, a decisive margin in compute throughput.

The Pro Duo's OpenCL score places it at the 80th percentile of all GPUs, and its nearest rivals are the NVIDIA Quadro GV100 (35,520, 1% lower), the NVIDIA GeForce RTX 5070 Ti Mobile (35,435, 1.2% lower), the NVIDIA T1000 (36,289, 1.2% higher), and the AMD Radeon RX 5300M (36,529, 1.8% higher). The Pro Duo sits comfortably in this range, indicating competitive compute performance against much newer professional and mobile cards.

The RX 6800's OpenCL score of 24,508 places it at the 75th percentile. Its nearest rivals in overall average benchmark score include the NVIDIA GeForce RTX 3070 Ti (29,945, 0.5% higher), the NVIDIA GeForce RTX 5070 Mobile (29,928, 0.6% higher), the NVIDIA GeForce RTX 2080 Ti (29,783, 1% higher), and the AMD Radeon RX 6700 (30,433, 1.1% higher). Note that the RX 6800's average benchmark score across all tests is 30,095, significantly higher than its OpenCL score, because it excels in other workloads.

In the broader benchmark suite, the RX 6800 shows its strengths in modern graphics tests. It scores 153,635 in Geekbench Metal, 115,107 in Geekbench Vulkan, 22,067 in Passmark G3D, and 10,864 in Passmark GPU Compute. It also records scores in DirectX 9 (257), DirectX 10 (128), DirectX 11 (214), and DirectX 12 (89) Passmark tests, plus 990 in Passmark G2D. The Pro Duo has no recorded scores in any of these tests, so no direct comparison is possible.

The data shows a clear split: the Pro Duo dominates in OpenCL compute, while the RX 6800 has a much broader benchmark profile covering modern graphics APIs and DirectX variants. The RX 6800's 3DMark Steel Nomad DX12 score of 3,188 is recorded, while the Pro Duo has no entry for this test.

Where Each One Wins

The Radeon Pro Duo wins decisively in OpenCL compute performance. Its 35,860 Geekbench OpenCL score is 46.3% higher than the RX 6800's 24,508, making it the superior choice for professional applications that rely heavily on OpenCL acceleration. The Pro Duo's architecture, with 4096 shading units and a 4096-bit HBM bus, was designed for this type of workload, and the data confirms its strength. Its 80th percentile ranking versus the RX 6800's 75th also indicates higher overall standing in the database's GPU hierarchy.

The RX 6800 wins in virtually every other measurable category. Its pixel rate of 202.1 GPixel/s versus 64.0 GPixel/s on the Pro Duo indicates vastly superior rasterization throughput for gaming. Its texture rate of 505.2 GTexel/s versus 256.0 GTexel/s doubles the Pro Duo's texturing capability. Its FP32 performance of 16.17 TFLOPS is nearly double the Pro Duo's 8.192 TFLOPS, and its FP16 performance of 32.33 TFLOPS is nearly four times higher.

The RX 6800's modern feature set is another clear win. DirectX 12 Ultimate support, 60 ray tracing cores, Vulkan 1.4, and PCIe 4.0 make it suitable for current games and applications, while the Pro Duo is limited to DirectX 12 (12_0), Vulkan 1.2.170, and PCIe 3.0. The RX 6800 also offers 16 GB of memory versus 4 GB, which is essential for high-resolution textures and complex compute workloads that exceed the Pro Duo's capacity.

Power efficiency also favors the RX 6800, with a 250 W TDP versus 350 W on the Pro Duo, and a lower suggested PSU requirement of 600 W versus 750 W. The RX 6800 achieves this with a smaller physical footprint (267 mm versus 277 mm length) and fewer power connectors (2x 8-pin versus 3x 8-pin).

For users prioritizing OpenCL compute in professional software, the Radeon Pro Duo remains a viable choice based on its benchmark dominance. For gaming, modern graphics features, higher resolution textures, and lower power consumption, the RX 6800 is the clear winner across nearly all recorded metrics.