AMD Radeon Pro W6600X vs AMD Radeon Pro W6800X Comparison

Head-to-Head Benchmarks

The database contains one direct benchmark comparison between the AMD Radeon Pro W6800X and the AMD Radeon Pro W6600X, and the result is decisive. In the Geekbench Metal test, the W6800X scores 196,844, while the W6600X scores 107,342. This gives the W6800X a lead of 83.4%, a massive margin that places the two cards in entirely different performance tiers.

To contextualize the W6800X's score, its average benchmark score of 160,671 places it in the 97th percentile among all GPUs in the database. Its nearest rivals include the NVIDIA A100 PCIe 40 GB at 162,504 (-1.1%), the AMD Radeon PRO W7800 at 164,894 (-2.6%), the NVIDIA RTX A5500 at 165,217 (-2.8%), and the NVIDIA RTX 4500 Ada Generation at 166,094 (-3.3%). The data shows that while the W6800X trails these four cards by small margins, it sits right at the edge of the top tier of workstation graphics.

The W6600X, by contrast, has an average benchmark score of 107,342, placing it in the 94th percentile. Its nearest rivals reveal a different competitive landscape: the AMD Radeon Pro Vega II Duo scores 106,750 (+0.6% relative to the W6600X), the AMD Radeon Pro Vega II scores 109,617 (-2.1%), the AMD Radeon PRO W7900 scores 110,725 (-3.1%), and the NVIDIA Quadro RTX 6000 scores 101,872 (+5.4%). The W6600X beats the Vega II Duo and the Quadro RTX 6000, but falls behind the Vega II and the PRO W7900.

The head-to-head delta of 83.4% is the single most important number in this comparison. It is not a marginal difference; it is a chasm. The W6800X delivers nearly double the Metal performance of the W6600X, which aligns with the substantial differences in their underlying specifications, detailed in later sections.

FAQ

Q: Which GPU is faster in Geekbench Metal?

A: The AMD Radeon Pro W6800X is significantly faster, scoring 196,844 compared to the W6600X's 107,342, a difference of 83.4%.

Q: How much memory does each card have?

A: The W6800X comes with 32 GB of GDDR6 memory on a 256-bit bus, while the W6600X has 8 GB of GDDR6 memory on a 128-bit bus.

Q: What are the memory bandwidth figures?

A: The W6800X delivers 512.0 GB/s of bandwidth, exactly double the 256.0 GB/s of the W6600X.

Q: Do both cards support the same APIs?

A: Yes, both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: What is the pixel rate of each card?

A: The W6800X achieves 200.4 GPixel/s, while the W6600X achieves 158.7 GPixel/s.

Q: Which card has a higher boost clock?

A: The W6600X has a higher boost clock at 2479 MHz, compared to 2087 MHz for the W6800X, despite being slower overall.

Architecture Differences

Both cards share the same RDNA 2.0 architecture and are built on TSMC's 7 nm process, but they use different chips. The W6800X is based on the Navi 21 chip, while the W6600X uses the Navi 23 chip. This fundamental difference drives nearly every other specification.

The Navi 21 chip in the W6800X is substantially larger and more complex. It contains 26,800 million transistors on a die size of 520 mm², yielding a transistor density of 51.5M per mm². The Navi 23 chip in the W6600X has 11,060 million transistors on a 237 mm² die, with a density of 46.7M per mm². The W6800X's chip has more than double the transistors and more than double the die area, explaining its much higher compute throughput.

The compute unit configuration follows the same pattern. The W6800X has 3840 shading units, 240 texture mapping units (TMUs), 96 render output units (ROPs), and 60 ray tracing cores. The W6600X has 2048 shading units, 128 TMUs, 64 ROPs, and 32 ray tracing cores. In every category, the W6800X has roughly 1.9 to 2.0 times the resources of the W6600X, which correlates directly with the observed benchmark delta.

Memory architecture also differs sharply. The W6800X uses a 256-bit bus with 32 GB of GDDR6, while the W6600X uses a 128-bit bus with 8 GB. Both run memory at 2000 MHz with 16 Gbps effective speed, but the wider bus on the W6800X doubles the bandwidth to 512.0 GB/s versus 256.0 GB/s.

Both cards have the same API support: DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Neither has tensor cores, and both are marked as end-of-life in the database.

Specification Differences

The specification sheet reveals a comprehensive list of differences between the two cards. Starting with clocks, the W6600X actually runs higher: base clock of 2068 MHz versus 1800 MHz, and boost clock of 2479 MHz versus 2087 MHz. Despite this clock advantage, the W6600X cannot overcome the W6800X's larger chip.

Memory is a decisive differentiator. The W6800X has 32 GB versus 8 GB, a 256-bit bus versus 128-bit, and 512.0 GB/s bandwidth versus 256.0 GB/s. The memory type is the same (GDDR6) and the effective speed is the same (16 Gbps), but the capacity and bus width are double on the W6800X.

Compute resources diverge significantly. The W6800X has 3840 shading units, 240 TMUs, 96 ROPs, and 60 ray tracing cores. The W6600X has 2048 shading units, 128 TMUs, 64 ROPs, and 32 ray tracing cores. The W6800X also leads in pixel rate (200.4 GPixel/s versus 158.7 GPixel/s) and texture rate (500.9 GTexel/s versus 317.3 GTexel/s).

Floating-point performance tells a similar story. The W6800X delivers 16.03 TFLOPS FP32 and 32.06 TFLOPS FP16 (2:1), while the W6600X delivers 10.15 TFLOPS FP32 and 20.31 TFLOPS FP16 (2:1).

Power and physical characteristics differ as well. The W6800X has a TDP of 200 W, is a quad-slot card, uses Apple MPX power connectors, and has a suggested PSU of 550 W. The W6600X has a TDP of 120 W, is a dual-slot card, has no separate power connectors listed, and has a suggested PSU of 300 W. The W6800X measures 267 mm in length and 120 mm in height; the W6600X has no recorded dimensions.

Display outputs are another major difference. The W6800X offers 1x HDMI 2.1 and 4x Thunderbolt, while the W6600X has no outputs at all. Both use the Apple MPX bus interface.

Both cards share the same release date of 2021-08-02, the same generation (Radeon Pro Mac, Navi II Series), and the same production status (end-of-life). The launch MSRP for the W6800X was 2,799 USD, and for the W6600X it was 699 USD.

Where Each One Wins

The AMD Radeon Pro W6800X wins in every measured benchmark category in the database. Its Geekbench Metal score of 196,844 is 83.4% higher than the W6600X's 107,342. It also leads in raw compute specifications: FP32 performance is 16.03 TFLOPS versus 10.15 TFLOPS, a 58% advantage. FP16 performance is 32.06 TFLOPS versus 20.31 TFLOPS, a similar margin.

The W6800X is the clear choice for workloads that demand high memory capacity and bandwidth. Its 32 GB of VRAM and 512.0 GB/s bandwidth make it suitable for large datasets, high-resolution textures, and complex 3D scenes. The 256-bit bus provides twice the memory throughput of the W6600X's 128-bit bus.

The W6800X also offers display outputs (1x HDMI 2.1 and 4x Thunderbolt), making it a viable solution for multi-display setups or direct video output. The W6600X has no outputs, meaning it is strictly a compute or rendering card that requires a separate display adapter.

The W6600X does have some advantages, though they are not benchmark wins. Its boost clock is higher (2479 MHz versus 2087 MHz), and its TDP is significantly lower (120 W versus 200 W). It is a dual-slot card versus the W6800X's quad-slot design, and it requires a less powerful PSU (300 W versus 550 W). The W6600X also has a smaller die (237 mm² versus 520 mm²) and fewer transistors (11,060 million versus 26,800 million), which implies lower manufacturing complexity.

The W6600X's 94th percentile ranking shows it is still a strong performer in absolute terms. It beats the AMD Radeon Pro Vega II Duo (106,750, +0.6%) and the NVIDIA Quadro RTX 6000 (101,872, +5.4%). For users already in the Mac ecosystem who need a secondary compute card without display output, the W6600X could serve as a capable accelerator.

The Verdict

The data points to a straightforward conclusion: the AMD Radeon Pro W6800X is the superior GPU by a wide margin. It wins the only head-to-head benchmark by 83.4%, and its specification sheet shows dominance in memory capacity, bandwidth, compute units, pixel rate, and texture rate. The W6800X belongs in the 97th percentile of all GPUs, sitting alongside the NVIDIA A100 PCIe 40 GB and AMD Radeon PRO W7800. Users who need maximum Metal performance, large VRAM pools, or direct display connectivity should choose the W6800X.

The AMD Radeon Pro W6600X is not a weak card. Its 94th percentile ranking and its wins over the Vega II Duo and Quadro RTX 6000 demonstrate solid performance. However, it lacks display outputs, has only 8 GB of VRAM, and delivers roughly half the compute throughput of the W6800X. Its higher boost clock (2479 MHz) and lower TDP (120 W) make it a more efficient and physically compact option, but efficiency does not translate into a benchmark victory here.

For users constrained by power, space, or PSU capacity, the W6600X is the more practical choice. Its dual-slot design and 300 W PSU requirement make it easier to integrate into existing systems. For users who prioritize raw performance, memory capacity, or the ability to drive displays directly, the W6800X is the only logical pick from the recorded data. The 83.4% delta in Geekbench Metal is not a nuance; it is the defining fact of this comparison.