AMD Radeon PRO W6600 vs AMD Radeon PRO W7900 Comparison

AMD Radeon PRO W7900 and AMD Radeon PRO W6600 represent two distinct tiers in AMD’s professional graphics lineup, separated by architecture generation, memory capacity, and raw compute capability. The W7900, built on RDNA 3.0 with a 5 nm process, delivers an average benchmark score of 110,725, placing it in the 94th percentile of all GPUs. The W6600, using RDNA 2.0 on a 7 nm node, achieves an average of 81,995, sitting in the 92nd percentile. The data shows a clear hierarchy, but the specifics of where each card wins and loses reveal a more nuanced picture than raw averages alone.

Where Each One Wins

The W7900 is the outright winner in every head-to-head benchmark recorded. In Geekbench OpenCL, it scores 84,379 against the W6600’s 73,514, a 14.8% advantage. The gap widens dramatically in Geekbench Vulkan, where the W7900 posts 137,070 versus 78,428, a 74.8% lead. These are not marginal differences; the Vulkan result shows the W7900 delivering nearly 75% more performance, indicating a substantial advantage in compute-heavy workloads that leverage modern graphics APIs.

The W6600’s wins are not in raw speed but in efficiency and physical footprint. It draws a 100 W TDP compared to the W7900’s 295 W, and it fits in a single slot versus the W7900’s triple-slot design. The W6600 requires only a 300 W suggested PSU and a single 6-pin connector, while the W7900 needs 600 W and dual 8-pin connectors. For workstations where power delivery or physical space is constrained, the W6600 is the only viable option despite its lower scores.

In terms of workload fit, the W7900’s 48 GB of GDDR6 memory with 864.0 GB/s bandwidth dominates memory-bound tasks. The W6600’s 8 GB and 224.0 GB/s bandwidth is a fraction of that. Any dataset exceeding 8 GB will spill over or fail on the W6600, making the W7900 the clear choice for large simulation, rendering, or AI inference jobs. The W6600, however, still holds its own in the 92nd percentile, meaning it outperforms most consumer and older professional GPUs, just not the W7900.

Architecture Differences

The architectural split is generational. The W7900 uses RDNA 3.0 on a 5 nm TSMC process, packing 57,700 million transistors into a 529 mm² die. The W6600 uses RDNA 2.0 on a 7 nm process, with 11,060 million transistors on a 237 mm² die. Transistor density tells the story: the W7900 achieves 109.1M transistors per mm², while the W6600 manages 46.7M per mm². This density advantage translates directly into compute resources.

The W7900 has 6,144 shading units, 384 TMUs, and 192 ROPs, compared to the W6600’s 1,792 shading units, 112 TMUs, and 64 ROPs. Ray tracing cores also differ: 96 on the W7900 versus 28 on the W6600. The FP32 throughput is 61.32 TFLOPS for the W7900 versus 9.247 TFLOPS for the W6600, a 6.6x difference. Notably, the W7900 runs FP16 at the same 1:1 rate as FP32 (61.32 TFLOPS), while the W6600 doubles its FP16 to 18.49 TFLOPS via a 2:1 ratio. This means the W6600’s FP16 advantage is only relative to its own FP32, not competitive with the W7900’s absolute numbers.

Memory architecture diverges as well. The W7900 uses a 384-bit bus with 48 GB GDDR6 at 18 Gbps effective, yielding 864.0 GB/s. The W6600 uses a 128-bit bus with 8 GB at 14 Gbps, yielding 224.0 GB/s. The W7900 also supports DisplayPort 2.1 outputs (3x DP 2.1 plus 1x mini-DP 2.1), while the W6600 is limited to DisplayPort 1.4a (4x). Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, so API compatibility is identical.

FAQ

Q: Which card has more memory bandwidth?

A: The W7900 has 864.0 GB/s bandwidth over a 384-bit bus, versus the W6600’s 224.0 GB/s over a 128-bit bus. That is a 3.86x difference in favor of the W7900.

Q: What is the FP32 compute difference?

A: The W7900 delivers 61.32 TFLOPS FP32, while the W6600 provides 9.247 TFLOPS. The W7900 is roughly 6.6 times faster in raw single-precision compute.

Q: Does the W6600 support ray tracing?

A: Yes, the W6600 has 28 ray tracing cores. The W7900 has 96, which is more than three times as many, but both are capable of hardware-accelerated ray tracing.

Q: What is the power consumption difference?

A: The W7900 has a 295 W TDP and requires a 600 W suggested PSU, while the W6600 has a 100 W TDP and a 300 W suggested PSU. The W6600 also uses a single-slot cooler and one 6-pin connector, whereas the W7900 is triple-slot with dual 8-pin connectors.

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

A: No. In the head-to-head benchmarks available (Geekbench OpenCL and Vulkan), the W7900 wins both. The W6600 has an additional Geekbench Metal score of 94,042, but there is no corresponding Metal result for the W7900 to compare.

Q: Which card is newer?

A: The W7900 was released on May 25, 2023, while the W6600 was released on June 7, 2021. The W7900’s production status is Active, whereas the W6600 is End-of-life.

Specification Differences

| Specification | AMD Radeon PRO W7900 | AMD Radeon PRO W6600 |

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

| Architecture | RDNA 3.0 | RDNA 2.0 |

| Process Node | 5 nm | 7 nm |

| Transistors | 57,700 million | 11,060 million |

| Die Size | 529 mm² | 237 mm² |

| Transistor Density | 109.1M / mm² | 46.7M / mm² |

| Base Clock | 1760 MHz | 2331 MHz |

| Boost Clock | 2495 MHz | 2580 MHz |

| Memory Speed | 2250 MHz (18 Gbps effective) | 1750 MHz (14 Gbps effective) |

| Memory Size | 48 GB | 8 GB |

| Memory Bus Width | 384 bit | 128 bit |

| Memory Bandwidth | 864.0 GB/s | 224.0 GB/s |

| Shading Units | 6144 | 1792 |

| TMUs | 384 | 112 |

| ROPs | 192 | 64 |

| RT Cores | 96 | 28 |

| Pixel Rate | 479.0 GPixel/s | 165.1 GPixel/s |

| Texture Rate | 958.1 GTexel/s | 289.0 GTexel/s |

| FP32 | 61.32 TFLOPS | 9.247 TFLOPS |

| FP16 | 61.32 TFLOPS (1:1) | 18.49 TFLOPS (2:1) |

| TDP | 295 W | 100 W |

| Slot Width | Triple-slot | Single-slot |

| Power Connectors | 2x 8-pin | 1x 6-pin |

| Suggested PSU | 600 W | 300 W |

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

| Display Outputs | 3x DP 2.1, 1x mini-DP 2.1 | 4x DP 1.4a |

| Length | 280 mm (11 inches) | 241 mm (9.5 inches) |

| Width | 51 mm (2 inches) | Not specified |

| Release Date | 2023-05-25 | 2021-06-07 |

| Production Status | Active | End-of-life |

Head-to-Head Benchmarks

The Geekbench OpenCL result shows a 14.8% lead for the W7900, with scores of 84,379 versus 73,514. This is a meaningful gap, but not overwhelming. OpenCL workloads often scale with memory bandwidth and compute unit count, and the W7900’s 864.0 GB/s versus 224.0 GB/s should theoretically produce a larger gap. The relatively modest 14.8% delta suggests that OpenCL on these cards may be limited by other factors like driver overhead or memory latency, not just raw throughput.

The Geekbench Vulkan result is a different story. The W7900 scores 137,070 against 78,428, a 74.8% advantage. This is nearly five times larger than the OpenCL gap. Vulkan is a lower-level API that exposes hardware capabilities more directly, and the W7900’s architecture appears to scale far better under this workload. The 6,144 shading units and 96 RT cores likely contribute to this outsized win, as Vulkan compute and graphics tasks can leverage the full hardware parallelism.

For context, the W7900’s average benchmark score of 110,725 places it just ahead of the AMD Radeon Pro W6600X (107,342, +3.2%) and slightly behind the NVIDIA RTX A5500 Mobile (113,944, -2.8%). The W6600’s average of 81,995 is marginally above the NVIDIA GeForce RTX 5090 (79,842, +2.7%) and the NVIDIA Tesla P100 PCIe 16 GB (79,605, +3.0%). This shows that while the W6600 is competitive with high-end consumer and older data center parts, the W7900 operates in a different performance class, rubbing shoulders with modern mobile workstation GPUs and prosumer cards.

The Verdict

The data points to a straightforward conclusion for most buyers. The W7900 wins every benchmark head-to-head, offers 6x the memory capacity, 3.86x the bandwidth, and 6.6x the FP32 compute. It is the only choice for workloads that require more than 8 GB of VRAM or demand maximum compute throughput. Its 94th percentile ranking and average score of 110,725 confirm it as a top-tier professional GPU, though its 295 W TDP and triple-slot cooler demand a workstation with ample power and space.

The W6600, despite losing all head-to-head comparisons, still holds a 92nd percentile ranking. Its 100 W TDP, single-slot form factor, and 300 W PSU requirement make it ideal for compact or power-constrained systems. It is also End-of-life, which may matter for long-term deployment. For users with workloads that fit within 8 GB of VRAM and do not require extreme compute, the W6600 remains a capable option, but the benchmark results show it is categorically slower. The choice is ultimately between maximum performance (W7900) and maximum efficiency and minimal footprint (W6600), with no middle ground based on the available data.