AMD Radeon PRO W6600 vs AMD Radeon Pro W6600X Comparison

The AMD Radeon Pro W6600X and the AMD Radeon PRO W6600 are two professional graphics cards built on the same fundamental architecture, yet the data reveals they are positioned for distinctly different workloads and systems. The W6600X is a specialized component designed exclusively for Apple’s MPX ecosystem, while the W6600 is a more conventional, standalone card for standard PC workstations. This analysis examines the benchmark results and specification differences to determine where each card excels, based solely on the provided data.

Where Each One Wins

The benchmark data presents a clear but narrow picture of performance. In the only head-to-head test available, the geekbench_metal benchmark, the AMD Radeon Pro W6600X emerges as the winner. It scores 107,342 compared to the W6600’s 94,042, a decisive 14.1% advantage. This is a significant margin in a professional graphics context, indicating that the W6600X holds a substantial lead in Metal API performance, which is the primary graphics and compute framework in Apple’s operating systems.

The W6600X’s victory in this single test is telling. Given that the card features "No outputs" and an "Apple MPX" bus interface, its entire design is optimized for integration into Mac Pro systems where Metal is the native language. The benchmark results align perfectly with this hardware profile. The W6600X is not just slightly faster; it is categorically the stronger performer for Metal-based workflows, such as rendering in Final Cut Pro or compute tasks in apps that leverage Apple’s framework.

Conversely, the AMD Radeon PRO W6600 does not win any of the head-to-head benchmarks. However, its data set includes scores for geekbench_opencl (73,514) and geekbench_vulkan (78,428), which are not provided for the W6600X. This absence of data is itself informative. While the W6600X is the clear winner in Metal, the W6600’s availability of OpenCL and Vulkan scores suggests it is a more versatile card for cross-platform environments where those APIs are common. The W6600’s win condition is not in raw performance against the W6600X, but in its broader software compatibility and its status as a general-purpose workstation card with standard display outputs.

Architecture Differences

Despite their performance disparity, both cards share a common foundation. They are both built on the Navi 23 chip using the RDNA 2.0 architecture, manufactured by TSMC on a 7 nm process node. This means they have identical transistor counts at 11,060 million and the same die size of 237 mm². The fundamental building blocks are the same, but AMD has configured them differently to serve different purposes.

The most significant architectural difference lies in the compute unit configuration. The W6600X is equipped with 2048 shading units, 128 texture mapping units (TMUs), and 32 ray tracing (RT) cores. In contrast, the W6600 has fewer of these resources, with 1792 shading units, 112 TMUs, and 28 RT cores. Both cards maintain 64 render output units (ROPs). This disparity in core counts is the primary reason for the W6600X’s superior performance in the Metal benchmark, as it can process more parallel workloads simultaneously.

Clock speeds also differ substantially, which further widens the performance gap. The W6600 has a higher base clock at 2331 MHz and a higher boost clock at 2580 MHz, compared to the W6600X’s base of 2068 MHz and boost of 2479 MHz. Interestingly, the W6600’s higher clocks do not compensate for its fewer cores, as evidenced by the benchmark results. The memory subsystems also differ, with the W6600X running its 8 GB of GDDR6 memory at 2000 MHz (16 Gbps effective) for a bandwidth of 256.0 GB/s, while the W6600 runs at 1750 MHz (14 Gbps effective) for 224.0 GB/s bandwidth. The bus width is identical at 128 bit.

These differences point to a strategic split. The W6600X is configured with more compute resources to maximize raw throughput, even at the cost of higher power draw (120 W TDP vs 100 W). The W6600 is a more conservative design, with fewer cores but a more conventional power profile and physical footprint.

Head-to-Head Benchmarks

The head-to-head data contains a single entry, but it is a decisive one. In the geekbench_metal test, the AMD Radeon Pro W6600X scores 107,342, while the AMD Radeon PRO W6600 scores 94,042. The delta is 14.1% in favor of the W6600X. This is not a marginal victory; it is a substantial lead that would translate into noticeably faster performance in Metal-accelerated workflows.

To contextualize this score, the W6600X’s performance is competitive with a different class of hardware. Its nearest rivals include the AMD Radeon Pro Vega II Duo with an average score of 106,750, which is only 0.6% behind the W6600X. It also outpaces the AMD Radeon Pro Vega II (109,617) slightly, with a delta of -2.1% indicating the W6600X is 2.1% slower than that card. The W6600X also leads the NVIDIA Quadro RTX 6000 by 5.4%, whose average score is 101,872. This places the W6600X in the upper echelon of professional graphics performance for its generation.

The W6600, in contrast, is positioned in a lower performance tier. Its average benchmark score of 81,995 places it near rivals like the AMD Radeon Pro Vega 64X (80,959), which it leads by a slim 1.3%. It also edges out the NVIDIA GeForce RTX 5090 (79,842) by 2.7% and the NVIDIA Tesla P100 variants by 3.0% and 3.3%. While these are not direct head-to-head results, the percentile data reinforces the gap: the W6600X sits in the 94th percentile of all GPUs, while the W6600 is in the 92nd percentile. The W6600X is not just faster; it is in a higher performance class altogether.

The Verdict

The data points to a clear but nuanced conclusion. The AMD Radeon Pro W6600X is the undisputed performance leader in Metal-based workloads, delivering a 14.1% advantage in the geekbench_metal test over the W6600. Its higher core count, faster memory, and superior bandwidth make it the obvious choice for users who require maximum performance within Apple’s ecosystem. Its launch MSRP was 699 USD, and it is a specialized component with an Apple MPX interface and no display outputs, meaning it is exclusively for Mac Pro systems.

The AMD Radeon PRO W6600, with a launch MSRP of 649 USD, is the more general-purpose card. It offers standard display outputs (4x DisplayPort 1.4a), a PCIe 4.0 x8 interface, and a single-slot design, making it suitable for a wide range of PC workstations. While it is slower in Metal, its available OpenCL and Vulkan benchmark scores suggest it is a more versatile option for environments that rely on those APIs. Its higher base and boost clocks (2331 MHz and 2580 MHz) are notable, but they do not overcome the core count deficit.

The verdict is simple: choose the W6600X if you are building or upgrading a Mac Pro and demand the highest possible Metal performance. Choose the W6600 if you need a flexible, standard-slot card for a PC that can handle a variety of APIs and display configurations. The data does not support the W6600 as a performance alternative to the W6600X; it supports it as a practical, multi-purpose alternative.

FAQ

Q: Which card is faster in the Metal API?

A: The AMD Radeon Pro W6600X is faster, scoring 107,342 in geekbench_metal compared to the W6600’s 94,042, a 14.1% difference.

Q: Do both cards have the same amount of memory?

A: Yes, both the W6600X and the W6600 are equipped with 8 GB of GDDR6 memory on a 128 bit bus.

Q: What is the main physical difference between the two cards?

A: The W6600X is a dual-slot card with an Apple MPX interface and no display outputs, while the W6600 is a single-slot card with a PCIe 4.0 x8 interface and 4x DisplayPort 1.4a outputs.

Q: Which card has a higher boost clock?

A: The AMD Radeon PRO W6600 has a higher boost clock of 2580 MHz, while the W6600X has a boost clock of 2479 MHz.

Q: How does the W6600X compare to the NVIDIA Quadro RTX 6000?

A: The W6600X’s average benchmark score is 5.4% higher than the NVIDIA Quadro RTX 6000’s average score of 101,872.

Q: Are there benchmark results for the W6600 in Vulkan?

A: Yes, the W6600 has a geekbench_vulkan score of 78,428. No Vulkan score is provided for the W6600X.

Specification Differences

| Specification | AMD Radeon Pro W6600X | AMD Radeon PRO W6600 |

| :--- | :--- | :--- |

| Base Clock | 2068 MHz | 2331 MHz |

| Boost Clock | 2479 MHz | 2580 MHz |

| Memory Clock | 2000 MHz (16 Gbps effective) | 1750 MHz (14 Gbps effective) |

| Memory Bandwidth | 256.0 GB/s | 224.0 GB/s |

| Shading Units | 2048 | 1792 |

| TMUs | 128 | 112 |

| RT Cores | 32 | 28 |

| Pixel Rate | 158.7 GPixel/s | 165.1 GPixel/s |

| Texture Rate | 317.3 GTexel/s | 289.0 GTexel/s |

| FP32 Performance | 10.15 TFLOPS | 9.247 TFLOPS |

| FP16 Performance | 20.31 TFLOPS (2:1) | 18.49 TFLOPS (2:1) |

| TDP | 120 W | 100 W |

| Slot Width | Dual-slot | Single-slot |

| Power Connectors | Not listed | 1x 6-pin |

| Bus Interface | Apple MPX | PCIe 4.0 x8 |

| Display Outputs | No outputs | 4x DisplayPort 1.4a |

| Launch MSRP | 699 USD | 649 USD |

| Release Date | 2021-08-02 | 2021-06-07 |