AMD Radeon Pro W6600X vs AMD Radeon PRO W6800 Comparison

# AMD Radeon PRO W6800 vs AMD Radeon Pro W6600X

The AMD Radeon PRO W6800 and the AMD Radeon Pro W6600X are both RDNA 2.0 professional graphics cards aimed at different segments of the workstation market, yet they deliver vastly different performance profiles. The data shows the W6800 outperforms the W6600X decisively in the only shared benchmark, but the W6600X still holds its own in the broader GPU landscape. Both cards are end-of-life products, with the W6800 launching in June 2021 and the W6600X following in August 2021, but their architectural choices and target platforms set them far apart in capability and use case.

Head-to-Head Benchmarks

The single direct comparison available is the Geekbench Metal test, and it is not close. The AMD Radeon PRO W6800 scores 174,420 points, while the AMD Radeon Pro W6600X scores 107,342 points. That represents a 62.5% advantage for the W6800. Such a margin suggests the W6800 is not merely faster but in a completely different performance class, likely due to its larger chip, more memory, and higher power envelope.

Looking at the broader benchmark context, the W6800’s average benchmark score is 135,396, which places it in the 96th percentile of all GPUs. Its nearest rivals include the NVIDIA A10M (135,230, +0.1%), the NVIDIA RTX 4000 Ada Generation (135,218, +0.1%), and the AMD Radeon Pro W6800X Duo (135,774, -0.3%). The W6800 is essentially tied with these cards, all within a single percentage point, indicating fierce competition at the high end of the workstation market. The AMD Radeon PRO V620 is slightly ahead at 136,472, a 0.8% delta.

The W6600X, by contrast, has an average benchmark score of 107,342, placing it in the 94th percentile — still strong, but notably behind. Its nearest rivals paint a different picture: the AMD Radeon Pro Vega II Duo (106,750, +0.6%) is nearly identical, the AMD Radeon Pro Vega II (109,617, -2.1%) is slightly ahead, and the AMD Radeon PRO W7900 (110,725, -3.1%) leads by a small margin. The NVIDIA Quadro RTX 6000 trails at 101,872, giving the W6600X a 5.4% advantage. This suggests the W6600X sits comfortably in the upper-midrange of professional GPUs, but it is nowhere near the W6800’s tier.

The Geekbench Metal delta of 62.5% is the headline number. No other test results exist for direct comparison, so the Metal score carries the full weight of the head-to-head analysis. The W6600X has no OpenCL or Vulkan results listed, while the W6800 shows 121,808 in OpenCL and 109,961 in Vulkan, further underscoring the W6800’s broader benchmark coverage and higher absolute scores.

FAQ

Q: Which card has the higher average benchmark score?

A: The AMD Radeon PRO W6800 has an average benchmark score of 135,396, compared to 107,342 for the AMD Radeon Pro W6600X — a difference of roughly 26% in favor of the W6800.

Q: How does the W6800 compare to the AMD Radeon Pro W6800X Duo?

A: The W6800 trails the W6800X Duo by just 0.3% in average score (135,396 vs 135,774), making them effectively equivalent in performance despite the Duo’s name suggesting higher capability.

Q: What is the performance gap between the W6600X and the NVIDIA Quadro RTX 6000?

A: The W6600X leads the Quadro RTX 6000 by 5.4% (107,342 vs 101,872), meaning it outperforms that older NVIDIA workstation card by a modest but meaningful margin.

Q: Which card has a higher percentile ranking among all GPUs?

A: The W6800 ranks in the 96th percentile, while the W6600X ranks in the 94th percentile. Both are high performers, but the W6800 sits slightly closer to the top of the global distribution.

Q: Does the W6600X have any benchmark results besides Geekbench Metal?

A: No. The FACT PACK only lists a Geekbench Metal score for the W6600X (107,342), whereas the W6800 also has Geekbench OpenCL (121,808) and Geekbench Vulkan (109,961) results.

Q: How much faster is the W6800 in Geekbench Metal?

A: The W6800 scores 174,420 versus 107,342 for the W6600X, a 62.5% increase — the largest single-metric gap between the two cards.

Architecture Differences

Both cards use the RDNA 2.0 architecture and are fabricated on TSMC’s 7 nm process, but they are built on fundamentally different chips. The W6800 uses the Navi 21 chip, while the W6600X uses the Navi 23 chip. This is the root of their performance disparity. Navi 21 is AMD’s flagship workstation die, and the W6800 packs 26,800 million transistors on a 520 mm² die, yielding a transistor density of 51.5M / mm². The W6600X’s Navi 23 is far smaller, with 11,060 million transistors on a 237 mm² die, giving a density of 46.7M / mm². The W6800 has more than double the transistors and over twice the die area, explaining its higher compute throughput.

The chip differences cascade into every computational unit. The W6800 features 3,840 shading units, 240 texture mapping units (TMUs), and 96 render output units (ROPs), along with 60 ray tracing cores. The W6600X has 2,048 shading units, 128 TMUs, and 64 ROPs, with 32 ray tracing cores. That is a 46.7% reduction in shading units and a 50% reduction in ray tracing cores, which directly impacts both rasterization and ray-traced workloads.

Memory architecture also diverges sharply. The W6800 uses a 256-bit memory bus with 32 GB of GDDR6, achieving 512.0 GB/s of bandwidth. The W6600X uses a 128-bit bus with 8 GB of GDDR6, halving the bandwidth to 256.0 GB/s. Both use 2000 MHz memory (16 Gbps effective), but the narrower bus on the W6600X is a severe bottleneck for memory-intensive tasks. The W6800’s pixel rate is 222.9 GPixel/s versus 158.7 GPixel/s for the W6600X, and its texture rate is 557.3 GTexel/s versus 317.3 GTexel/s.

Compute performance follows the same trend. The W6800 delivers 17.83 TFLOPS of FP32 and 35.67 TFLOPS of FP16 (2:1), while the W6600X delivers 10.15 TFLOPS of FP32 and 20.31 TFLOPS of FP16. The W6800 is roughly 75% faster in raw FP32 throughput. Both cards support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, so API coverage is identical.

Specification Differences

The W6800 and W6600X differ on nearly every specification that matters. The W6800 has a base clock of 1575 MHz and a boost clock of 2322 MHz, while the W6600X runs higher clocks at 2068 MHz base and 2479 MHz boost. Despite the W6600X’s higher clocks, the W6800’s massive advantage in core count and memory bandwidth wins out.

Memory capacity is a major divider: 32 GB on the W6800 versus 8 GB on the W6600X. The bus width is 256-bit versus 128-bit, and bandwidth is 512.0 GB/s versus 256.0 GB/s. The W6800’s power draw is 250 W with a suggested PSU of 600 W, while the W6600X draws just 120 W with a suggested PSU of 300 W. The W6800 requires 1x 6-pin and 1x 8-pin power connectors; the W6600X has no external power connectors listed.

The cards also differ in physical and interface design. The W6800 is a dual-slot card measuring 267 mm in length, 120 mm in height, and 50 mm in width, using a PCIe 4.0 x16 interface. It offers 6x mini-DisplayPort 1.4a outputs. The W6600X is also dual-slot but has no listed dimensions and uses an Apple MPX bus interface with no display outputs — it is designed for integration into Apple systems, not standalone use. The W6800 has a launch MSRP of 2,249 USD; the W6600X has a launch MSRP of 699 USD. The W6800’s predecessor is the Radeon Pro Vega, while the W6600X has no listed predecessor.

Where Each One Wins

The W6800 wins outright in raw performance, memory capacity, and bandwidth. Its 62.5% lead in Geekbench Metal makes it the clear choice for compute-heavy workloads, large datasets, and multi-display setups. The 32 GB memory buffer is ideal for tasks like 8K video editing, complex 3D rendering, or machine learning inference where memory capacity is a hard constraint. Its 6x mini-DisplayPort outputs enable multi-monitor configurations that the W6600X cannot support at all. The W6800’s higher FP32 and FP16 throughput also make it better suited for GPU-accelerated simulations and scientific computing.

The W6600X wins on efficiency and integration. Its 120 W power draw is less than half the W6800’s 250 W, and it requires no external power connectors, making it far simpler to install in compatible Apple MPX systems. The higher base and boost clocks (2068 MHz and 2479 MHz versus 1575 MHz and 2322 MHz) suggest better clock-for-clock efficiency, even if the raw core count is lower. Its 5.4% lead over the NVIDIA Quadro RTX 6000 shows it can hold its own against older high-end cards, and its 94th percentile ranking means it is still a respectable performer for its intended market. The W6600X’s 8 GB memory is sufficient for moderate workloads, and its lack of display outputs indicates it is meant as a secondary compute card in a Mac Pro, not a primary display driver.

The Verdict

The data is unambiguous: the AMD Radeon PRO W6800 is the superior card in every performance metric measured. A 62.5% lead in Geekbench Metal, a 96th percentile ranking, and 32 GB of memory make it a high-end workstation powerhouse. Its nearest rivals are all within 1% of its average score, which means it competes directly with the NVIDIA A10M and RTX 4000 Ada Generation. Anyone needing maximum compute throughput, large memory capacity, or multiple display outputs should choose the W6800.

The AMD Radeon Pro W6600X is a different beast — a low-power, Apple-specific card with no display outputs and a 94th percentile ranking. It is not a competitor to the W6800 in performance; it is a companion or secondary compute card for Mac Pro systems. Its 120 W draw and lack of power connectors make it easy to deploy, and its 5.4% advantage over the Quadro RTX 6000 shows it is no slouch. But its 8 GB memory and 256.0 GB/s bandwidth are severe limitations for large workloads.

Choose the W6800 for heavy compute, large datasets, or multi-monitor workstations. Choose the W6600X if you need a low-power compute add-in card for Apple MPX systems and can live with a fraction of the W6800’s performance. The 62.5% delta between them is not a refinement gap — it is a chasm separating two entirely different product categories.