AMD Radeon PRO W6600 vs AMD Radeon PRO W6800 Comparison

Head-to-Head Benchmarks

The recorded data shows a decisive performance hierarchy between these two RDNA 2.0 workstation cards. Across all three Geekbench compute tests, the AMD Radeon PRO W6800 wins outright, with the largest margin appearing in the Metal API test. In geekbench_metal, the W6800 scores 174420 against the W6600’s 94042, a delta of 85.5%. That is not a marginal advantage; it is nearly double the raw score, indicating a fundamental difference in compute throughput under Apple’s Metal framework, likely driven by the larger GPU core configuration.

The gap narrows somewhat in OpenCL, where the W6800 delivers 121808 versus 73514 for the W6600, a 65.7% delta. OpenCL tends to scale with raw shader count and memory bandwidth, and the data reflects that the W6800’s larger die and wider memory interface provide a substantial but less extreme lead compared to Metal. The smallest victory for the W6800 appears in geekbench_vulkan, where it scores 109961 against 78428, a 40.2% delta. Vulkan is often more sensitive to driver overhead and command buffer efficiency, so a smaller gap here suggests the W6600’s architectural efficiency partially compensates for its reduced hardware resources.

Looking at the aggregate picture, the W6800’s average benchmark score across all tests is 135396, while the W6600 sits at 81995. That places the W6800 65.1% higher on average, a gap that broadly tracks the differences in shading units, TMUs, and memory bandwidth. The W6800 also ranks at the 96th percentile among all GPUs in the database, while the W6600 ranks at the 92nd percentile. Both are high-performing parts, but the W6800 is clearly in a higher tier. Its nearest rivals in the database include the NVIDIA A10M at 135230 (0.1% lower), the NVIDIA RTX 4000 Ada Generation at 135218 (0.1% lower), and the AMD Radeon Pro W6800X Duo at 135774 (0.3% higher). The W6600, by contrast, sits near the NVIDIA GeForce RTX 5090 at 79842 (2.7% lower) and the Tesla P100 PCIe 16 GB at 79605 (3% lower). The W6600’s closest competitor is the AMD Radeon Pro Vega 64X at 80959, which trails by 1.3%. This reinforces that the W6800 competes at the top of the professional GPU stack, while the W6600 holds a strong mid-range position.

The wins tally is unambiguous: the W6800 wins 3 out of 3 head-to-head benchmarks. No test in the database favors the W6600. However, the per-test deltas show that the W6600 is not a weak card; it is simply outclassed by the W6800’s larger silicon. For users comparing within the same product family, the data indicates that choosing the W6600 means accepting a 40% to 85% performance deficit depending on the API workload, in exchange for a much lower power envelope and physical footprint.

Architecture Differences

Both cards share the RDNA 2.0 architecture and the same 7 nm TSMC process node, so the fundamental instruction set and feature support are identical. The critical differences lie in the physical implementation. The W6800 uses the Navi 21 chip, which contains 26,800 million transistors on a 520 mm² die. The W6600 uses the Navi 23 chip, with 11,060 million transistors on a 237 mm² die. That is a 2.4x transistor count advantage for the W6800, and the die area difference is even larger at 2.2x. Transistor density is slightly higher on the W6800 as well: 51.5 million per mm² versus 46.7 million per mm² on the W6600. This suggests the W6800’s larger die is not just scaled up; it is also marginally more efficiently packed.

The compute resources diverge sharply. The W6800 has 3840 shading units, 240 TMUs, and 96 ROPs, while the W6600 has 1792 shading units, 112 TMUs, and 64 ROPs. The W6800 also carries 60 ray accelerators (RT cores) versus 28 on the W6600. In every category, the W6800 has more than double the execution resources. This explains the benchmark deltas: raw shader throughput directly translates into Metal and OpenCL performance, and the W6800’s FP32 rate of 17.83 TFLOPS is nearly double the W6600’s 9.247 TFLOPS. The FP16 rates are 35.67 TFLOPS (2:1 ratio) and 18.49 TFLOPS (2:1 ratio) respectively, again roughly a 1.9x gap.

Memory architecture is another major differentiator. The W6800 has 32 GB of GDDR6 on a 256-bit bus, yielding 512.0 GB/s of bandwidth. The W6600 has 8 GB of GDDR6 on a 128-bit bus, yielding 224.0 GB/s. That is a 2.29x bandwidth advantage for the W6800, and a 4x capacity advantage. Effective memory speed also differs: the W6800 runs at 16 Gbps, while the W6600 runs at 14 Gbps. For large datasets, such as 3D scene geometry or multi-texture rendering, the W6800’s bandwidth and capacity headroom are decisive. The pixel rate is 222.9 GPixel/s on the W6800 versus 165.1 GPixel/s on the W6600, and the texture rate is 557.3 GTexel/s versus 289.0 GTexel/s. These are large margins, but not as large as the raw shader count, because ROP and TMU efficiency scales differently with clock speeds.

Clock speeds actually favor the smaller card. The W6600 has a base clock of 2331 MHz and a boost clock of 2580 MHz, while the W6800 has a base clock of 1575 MHz and a boost clock of 2322 MHz. The W6600’s higher clocks partially compensate for its reduced core count, but not enough to close the gap. The W6800’s lower base clock likely reflects the thermal and power constraints of a 250 W TDP, while the W6600’s 100 W TDP allows for aggressive clocking on a smaller die. The power connector requirements reflect this: the W6800 needs 1x 6-pin plus 1x 8-pin, while the W6600 needs only 1x 6-pin. The suggested PSU rating is 600 W for the W6800 and 300 W for the W6600.

Physical dimensions differ as well. The W6800 is a dual-slot card, 267 mm long, 120 mm high, and 50 mm wide. The W6600 is single-slot, 241 mm long, with no recorded height or width. The W6800 offers 6x mini-DisplayPort 1.4a outputs, while the W6600 offers 4x DisplayPort 1.4a outputs. The bus interface also differs: the W6800 uses PCIe 4.0 x16, while the W6600 uses PCIe 4.0 x8. For bandwidth-intensive workloads that rely on host memory transfers, the x16 interface is a meaningful advantage, though the W6600’s x8 slot is adequate for many tasks. Both cards support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, so API feature parity is complete.

FAQ

Q: Which card has higher raw compute throughput in FP32?

A: The AMD Radeon PRO W6800 delivers 17.83 TFLOPS FP32, while the AMD Radeon PRO W6600 delivers 9.247 TFLOPS. The W6800 is 92.8% faster in this metric.

Q: How does memory capacity compare between the two cards?

A: The W6800 has 32 GB of GDDR6, while the W6600 has 8 GB of GDDR6. The W6800 also has a 256-bit bus versus a 128-bit bus, resulting in 512.0 GB/s versus 224.0 GB/s bandwidth.

Q: Are there any benchmark tests where the W6600 wins?

A: No. In the database, the W6800 wins all three head-to-head tests (geekbench_metal, geekbench_opencl, geekbench_vulkan). The W6600’s best relative result is in Vulkan, where it trails by 40.2%.

Q: What is the power consumption difference?

A: The W6800 has a TDP of 250 W, while the W6600 has a TDP of 100 W. The W6800 requires a 600 W suggested PSU and dual power connectors (1x 6-pin + 1x 8-pin), while the W6600 requires a 300 W PSU and a single 6-pin connector.

Q: Do both cards support the same graphics APIs?

A: Yes. Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. There is no difference in the listed API support.

Q: Which card has higher clock speeds?

A: The W6600 has higher clocks: 2331 MHz base and 2580 MHz boost. The W6800 runs at 1575 MHz base and 2322 MHz boost. Despite lower clocks, the W6800 wins all benchmarks due to its larger core count and memory system.

The Verdict

The data points to a clear choice for users who prioritize maximum compute performance in a workstation GPU. The AMD Radeon PRO W6800 is the superior card in every measured benchmark, with a 65.1% higher average score and a 96th percentile ranking versus the W6600’s 92nd percentile. It offers more than double the shading units, TMUs, ROPs, and ray accelerators, along with four times the memory capacity and 2.29x the bandwidth. For workloads that are shader-bound or memory-bound, such as 3D rendering, video compositing, or large dataset processing, the W6800 is the only rational choice from this pair. The benchmark deltas of 85.5% in Metal, 65.7% in OpenCL, and 40.2% in Vulkan are not incremental; they represent a different performance class.

However, the W6600 is not without merit for a specific set of users. Its 100 W TDP and single-slot design make it suitable for dense multi-GPU configurations or systems with limited physical space and cooling capacity. The 300 W PSU requirement and single 6-pin power connector mean it can be installed in far more modest workstations without power supply upgrades. At 241 mm in length, it is also shorter, easing case compatibility. The W6600’s higher clock speeds (2580 MHz boost versus 2322 MHz) indicate that its smaller die is running at the edge of the efficiency curve, and for workloads that are latency-sensitive or that do not exceed 8 GB of VRAM, the performance gap to the W6800 may be acceptable. Its nearest rival, the AMD Radeon Pro Vega 64X, trails by 1.3%, so the W6600 is competitively positioned within its own tier.

The decision hinges on the workload’s memory ceiling and power budget. If a task requires more than 8 GB of VRAM, the W6600 is disqualified outright, and the W6800’s 32 GB capacity is the deciding factor. If the task fits within 8 GB and the system has strict power or slot constraints, the W6600’s 40.2% deficit in Vulkan and 65.7% deficit in OpenCL may be an acceptable trade for its operational simplicity. But for any user who asks which card is faster, the answer from the database is unambiguous: the W6800, in every test, by margins ranging from 40.2% to 85.5%.

Specification Differences

| Specification | AMD Radeon PRO W6800 | AMD Radeon PRO W6600 |

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

| Chip | Navi 21 | Navi 23 |

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

| Die Size | 520 mm² | 237 mm² |

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

| Base Clock | 1575 MHz | 2331 MHz |

| Boost Clock | 2322 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 | 3840 | 1792 |

| TMUs | 240 | 112 |

| ROPs | 96 | 64 |

| RT Cores | 60 | 28 |

| Pixel Rate | 222.9 GPixel/s | 165.1 GPixel/s |

| Texture Rate | 557.3 GTexel/s | 289.0 GTexel/s |

| FP32 | 17.83 TFLOPS | 9.247 TFLOPS |

| FP16 | 35.67 TFLOPS (2:1) | 18.49 TFLOPS (2:1) |

| TDP | 250 W | 100 W |

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

| Power Connectors | 1x 6-pin + 1x 8-pin | 1x 6-pin |

| Suggested PSU | 600 W | 300 W |

| Bus Interface | PCIe 4.0 x16 | PCIe 4.0 x8 |

| Display Outputs | 6x mini-DisplayPort 1.4a | 4x DisplayPort 1.4a |

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

| Height | 120 mm (4.7 inches) | Not recorded |

| Width | 50 mm (2 inches) | Not recorded |

| Launch MSRP | 2,249 USD | 649 USD |

| Geekbench Metal | 174420 | 94042 |

| Geekbench OpenCL | 121808 | 73514 |

| Geekbench Vulkan | 109961 | 78428 |

| Average Benchmark Score | 135396 | 81995 |

| Percentile vs All GPUs | 96th | 92nd |