AMD Radeon PRO W6600 vs AMD Radeon Pro W6900X Comparison

Head-to-Head Benchmarks

The benchmark data shows a decisive sweep for the AMD Radeon Pro W6900X across all three recorded tests. The largest gap appears in Geekbench Metal, where the W6900X scores 226,821 against the PRO W6600's 94,042, a 141.2% advantage. This is more than double the score, indicating a substantial performance gulf in Metal-based workloads, which are commonly used in macOS creative applications.

In Geekbench OpenCL, the W6900X posts 130,035 versus 73,514 for the PRO W6600, a 76.9% lead. OpenCL is a cross-platform compute API, and this result suggests the W6900X maintains a strong advantage in general-purpose GPU compute tasks, though the margin is smaller than in Metal. The Vulkan test shows the W6900X at 148,865 compared to 78,428, a 89.8% lead, placing the gap between the other two tests.

The W6900X wins all three head-to-head benchmarks, with zero wins for the PRO W6600. The average benchmark score reinforces this hierarchy: the W6900X averages 168,574 across all recorded tests, while the PRO W6600 averages 81,995. That is roughly a 105.6% difference based on the raw averages, placing the W6900X in a different performance tier entirely.

Context from the nearest rivals helps interpret these scores. The W6900X sits at the 97th percentile among all GPUs in the database, with its closest competitor being the NVIDIA RTX 4500 Ada Generation at an average score of 166,094, a 1.5% delta. The NVIDIA RTX A5500 follows at 165,217 (2% delta), and the AMD Radeon PRO W7800 at 164,894 (2.2% delta). These tiny margins indicate the W6900X is clustered at the top of the performance hierarchy, barely ahead of several strong workstation cards.

The PRO W6600, by contrast, sits at the 92nd percentile, with its nearest rival being the AMD Radeon Pro Vega 64X at 80,959 (1.3% delta). The NVIDIA GeForce RTX 5090 appears at 79,842 (2.7% delta), and two Tesla P100 variants trail at 79,605 and 79,396 (3% and 3.3% deltas respectively). The PRO W6600 leads its immediate rivals by small margins, but those rivals are themselves far below the W6900X's competitive set. The data shows a clear two-tier structure: the W6900X competes near the top of the database, while the PRO W6600 competes in the upper-middle tier.

Architecture Differences

Both cards share the RDNA 2.0 architecture, but they are built on very different scales. The W6900X uses the Navi 21 chip, a large die measuring 520 mm² on a 7 nm TSMC process, housing 26,800 million transistors. The PRO W6600 uses Navi 23, a 237 mm² die on the same 7 nm TSMC node, with 11,060 million transistors. The transistor density tells part of the story: 51.5M per mm² for the W6900X versus 46.7M per mm² for the PRO W6600, meaning the larger chip is also denser as well as bigger.

The shader configs differ substantially. The W6900X contains 5,512 shading units, 320 TMUs, 128 ROPs, and 80 ray tracing cores. The PRO W6600 has 1,792 shading units, 112 TMUs, 64 ROPs, and 28 ray tracing cores. In every compute unit count, the W6900X has a clear numerical advantage, though the PRO W6600's higher clock speeds partially offset this. The W6900X runs a 1,825 MHz base clock and boosts to 2,171 MHz, while the PRO W6600 runs a higher 2,331 MHz base and 2,580 MHz boost. Despite the higher clocks, the W6900X's raw throughput numbers far exceed the PRO W6600. The FP32 output sits at 22.23 TFLOPS for the W6900X against 9.247 TFLOPS for the PRO W6600. FP16 follows the same pattern at 44.46 TFLOPS versus 18.49 TFLOPS, both at a 2:1 ratio. Pixel rate is 277.9 GPixel/s versus 165.1 GPixel/s, and texture rate is 694.7 GTexel/s versus 289.0 GTexel/s.

Memory architecture diverges sharply. The W6900X carries 32 GB of GDDR6 on a 256 bit bus, delivering 512.0 GB/s of bandwidth at 2,000 MHz (16 Gbps effective). The PRO W6600 has 8 GB of GDDR6 on a 128 bit bus, providing 224.0 GB/s at 1,750 MHz (14 Gbps effective). The W6900X offers four times the capacity and over twice the bandwidth. Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, so API coverage is identical. The physical and power characteristics differ significantly: the W6900X draws 300 W TDP with a 700 W suggested PSU, while the PRO W6600 draws 100 W TDP with a 300 W suggested PSU. The W6900X uses an Apple MPX bus interface, while the PRO W6600 uses PCIe 4.0 x8. Display outputs also differ: the W6900X provides 1x HDMI 2.1 and 4x Thunderbolt, while the PRO W6600 provides 4x DisplayPort 1.4a. The PRO W6600 is a single-slot card with a 1x 6-pin power connector; the W6900X lists no slot width or power connector details in the database.

FAQ

Q: Which card has the higher average benchmark score?

A: The AMD Radeon Pro W6900X averages 168,574 across all recorded tests, while the AMD Radeon PRO W6600 averages 81,995.

Q: How much faster is the W6900X in Metal workloads?

A: The W6900X scores 226,821 in Geekbench Metal versus 94,042 for the PRO W6600, a 141.2% lead.

Q: Do both cards use the same memory type?

A: Yes, both use GDDR6, but with different capacities and bandwidths. The W6900X has 32 GB and 512.0 GB/s, while the PRO W6600 has 8 GB and 224.0 GB/s.

Q: What is the TDP difference between the two cards

A: The W6900X has a 300 W TDP and suggests a 700 W PSU, while the PRO W6600 has a 100 W TDP and suggests a 300 W PSU.

Q: Which card has more ray tracing cores?

A: The W6900X has 80 ray tracing cores, while the PRO W6600 has 28.

Q: What is the production status of both cards?

A: Both the AMD Radeon Pro W6900X and the AMD Radeon PRO W6600 are listed as end-of-life products in the database.

The Verdict

The AMD Radeon Pro W6900X is the clear performance winner across all recorded benchmarks. It leads by at least 76.9% in every test, with the largest margin in Metal at 141.2%. It also ranks higher in the overall database, at the 97th percentile, and its average score of 168,574 places it among top-tier workstation GPUs. The data indicates this card is suited for high-end workloads where maximum compute throughput and large memory capacity are required. Its 32 GB memory and 512.0 GB/s bandwidth are a match for demanding data sets and high-resolution rendering tasks.

The AMD Radeon PRO W6600 is a much lighter card in every measurable way. Its average score of 81,995 and 92nd percentile rank show it is still a competent performer relative to the broader GPU market, but it sits far below the W6900X. Its lower TDP of 100 W and smaller physical footprint make it a more flexible option for compact systems, and its higher boost clock of 2,580 MHz does not compensate for the massive difference in shader count and memory bandwidth. The data supports choosing the PRO W6600 only when the workload fits within its 8 GB memory limit and when the W6900X's performance headroom is unnecessary.

For anyone who needs the highest possible scores in Metal, OpenCL, or Vulkan, the W6900X is the unambiguous choice. For those who prioritize lower power draw and a smaller form factor, the PRO W6600 offers a reasonable balance, but the benchmark results show no scenario where it outperforms the W6900X.

Specification Differences

| Specification | AMD Radeon Pro W6900X | AMD Radeon PRO W6600 |

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

| Chip | Navi 21 | Navi 23 |

| Generation | Radeon Pro Mac (Navi II Series) | Radeon Pro Navi (Navi II Series) |

| Process Node | 7 nm | 7 nm |

| Transistors | 26,800 million | 11,060 million |

| Die Size | 520 mm² | 237 mm² |

| Transistor Density | 51.5M / mm² | 46.7M / mm² |

| Base Clock | 1825 MHz | 2331 MHz |

| Boost Clock | 2171 MHz | 2580 MHz |

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

| Memory Size | 32 GB | 8 GB |

| Memory Bus Width | 256 bit | 128 bit |

| Memory Bandwidth | 512.0 GB/s | 224.0 GB/s |

| Shading Units | 5120 | 1792 |

| TMUs | 320 | 112 |

| ROPs | 128 | 64 |

| RT Cores | 80 | 28 |

| Pixel Rate | 277.9 GPixel/s | 165.1 GPixel/s |

| Texture Rate | 694.7 GTexel/s | 289.0 GTexel/s |

| FP32 | 22.23 TFLOPS | 9.247 TFLOPS |

| FP16 | 44.46 TFLOPS (2:1) | 18.49 TFLOPS (2:1) |

| TDP | 300 W | 100 W |

| Suggested PSU | 700 W | 300 W |

| Bus Interface | Apple MPX | PCIe 4.0 x8 |

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

| Slot Width | Not specified | Single-slot |

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

| Length | 267 mm (10.5 inches) | 241 mm (9.5 inches) |

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

| Launch MSRP | 5,999 USD | 649 USD |

| Predecessor | Not specified | Radeon Pro Vega |