AMD Radeon Pro W6600X vs AMD Radeon RX 6650M Comparison

Where Each One Wins

The AMD Radeon Pro W6600X and the AMD Radeon RX 6650M occupy different corners of the mobile workstation and gaming landscape. Despite sharing the same underlying silicon, their design goals diverge sharply. The Pro W6600X is engineered as a Mac-centric workstation solution, while the RX 6650M is a portable gaming-oriented part. The recorded benchmark data shows a clear split: the Pro W6600X dominates in the single available cross-platform metric, while the RX 6650M’s strengths are more dispersed across its own benchmark suite.

The Pro W6600X’s win comes in the Geekbench Metal test, where it scores 107,342 points. This places it in the 94th percentile of all GPUs, indicating it sits near the top of the database’s performance distribution. Its average benchmark score matches this figure, as it has only one recorded test. The RX 6650M, by contrast, has a lower overall standing at the 91st percentile, with an average score of 71,768 across its two tests. The Pro card’s Metal score is not directly comparable to the RX 6650M’s OpenCL and Vulkan results, but the percentile gap suggests the workstation part holds a higher tier position in the overall hierarchy.

The RX 6650M’s wins are internal to its own benchmark runs. Its Geekbench Vulkan score of 77,735 exceeds its OpenCL score of 65,800 by a meaningful margin. This indicates the mobile GPU responds particularly well to Vulkan’s explicit, lower-overhead API model. For users prioritizing Vulkan-based workloads, the RX 6650M presents a stronger profile. Its OpenCL result, while lower, still places it within striking distance of its nearest rivals, with a -0.5% delta against the NVIDIA TITAN X Pascal and -0.8% against the AMD Radeon Pro Vega 64.

Architecture Differences

Both GPUs are built on the Navi 23 chip, using AMD’s RDNA 2.0 architecture. They share the same 7 nm process from TSMC, the same 11,060 million transistor count, and an identical die size of 237 mm². The transistor density is also the same at 46.7M per mm². This means the fundamental silicon is identical; the differences arise from how AMD bins and configures the silicon for each market segment.

The Pro W6600X is configured as a full-fat implementation. It carries 2,048 shading units, 128 texture mapping units, and 64 raster output units. The RX 6650M is a cut-down version, with 1,792 shading units and 112 TMUs, though it retains the same 64 ROPs. This 12.5% reduction in shader count and TMUs directly impacts compute throughput. The ray tracing cores also differ: the Pro has 32, while the mobile part has 28. Neither GPU includes dedicated tensor cores, as this is not a feature of RDNA 2.0.

Clock speeds tell a more nuanced story. The Pro W6600X runs at a base clock of 2068 MHz and boosts to 2479 MHz. The RX 6650M matches the base clock at 2068 MHz but boosts to 2416 MHz, which is 63 MHz lower. The mobile part also lists a game clock of 2222 MHz, a figure the Pro card does not specify. Memory clocks diverge as well: the Pro runs its GDDR6 at 2000 MHz (16 Gbps effective), while the RX 6650M runs at 1750 MHz (14 Gbps effective). This yields a bandwidth advantage for the Pro: 256.0 GB/s versus 224.0 GB/s, a 14.3% gap.

Memory capacity and bus width are identical: 8 GB GDDR6 on a 128-bit interface. The power envelope is also the same at 120 W TDP. However, the physical form factor differs significantly. The Pro W6600X is a dual-slot card with an Apple MPX bus interface and no display outputs, meaning it is designed to be installed inside a Mac Pro chassis. The RX 6650M is an integrated graphics processor (IGP) with no power connectors, using a PCIe 4.0 x8 interface, and its display outputs are portable device dependent. This is a fundamental design split: one is a removable card, the other is soldered onto a mobile platform.

Head-to-Head Benchmarks

The database does not contain direct head-to-head benchmark runs between these two GPUs. Instead, each has its own set of recorded tests, and the comparison must be drawn from their individual scores and relative positions.

The Pro W6600X’s Geekbench Metal score of 107,342 is its sole data point. This puts it 0.6% ahead of the AMD Radeon Pro Vega II Duo, which scores 106,750. It trails the AMD Radeon Pro Vega II by 2.1% (109,617) and the AMD Radeon PRO W7900 by 3.1% (110,725). Against the NVIDIA Quadro RTX 6000, the Pro W6600X is 5.4% ahead (101,872). These deltas show a GPU that sits in a tight cluster with other high-end workstation parts, slightly behind the current flagship but comfortably ahead of an older professional card.

The RX 6650M’s two scores present a different picture. Its Geekbench Vulkan result of 77,735 is its stronger showing. Its Geekbench OpenCL result of 65,800 is weaker. The average of these two, 71,768, places it in a competitive mobile segment. Against its nearest rivals, the RX 6650M is 0.5% behind the NVIDIA TITAN X Pascal (72,098) and 0.8% behind the AMD Radeon Pro Vega 64 (72,379). It is 1.3% ahead of the AMD Radeon RX 6600 LE (70,829) and 2.2% behind the AMD Radeon Vega Frontier Edition (73,370).

The biggest win for the Pro W6600X is its Metal compute dominance, which is a critical metric for macOS-based workflows. The biggest win for the RX 6650M is its Vulkan performance, which exceeds its own OpenCL result by 18.1%. In terms of raw compute, the Pro’s 10.15 TFLOPS FP32 output is 17.2% higher than the RX 6650M’s 8.659 TFLOPS. The Pro also leads in texture rate, 317.3 GTexel/s versus 270.6 GTexel/s, a 17.3% advantage. Pixel rates are closer, with the Pro at 158.7 GPixel/s versus 154.6 GPixel/s for the mobile part, a 2.7% difference.

FAQ

Q: Which GPU has a higher overall benchmark percentile?

A: The AMD Radeon Pro W6600X sits in the 94th percentile of all GPUs, while the AMD Radeon RX 6650M is in the 91st percentile.

Q: How do the two GPUs compare in memory bandwidth?

A: The Pro W6600X offers 256.0 GB/s, which is 14.3% higher than the RX 6650M’s 224.0 GB/s. Both use 8 GB of GDDR6 on a 128-bit bus.

Q: What is the RX 6650M’s best benchmark result?

A: Its Geekbench Vulkan score of 77,735 is its strongest recorded result, exceeding its OpenCL score of 65,800 by 18.1%.

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

A: In Geekbench Metal, the Pro W6600X scores 107,342, which is 5.4% ahead of the Quadro RTX 6000’s 101,872.

Q: Are the clock speeds identical between the two GPUs?

A: No. Both have a base clock of 2068 MHz, but the Pro W6600X boosts to 2479 MHz, while the RX 6650M boosts to 2416 MHz and has a game clock of 2222 MHz.

Q: What are the physical differences in mounting?

A: The Pro W6600X is a dual-slot card with an Apple MPX interface and no display outputs. The RX 6650M is an integrated GPU with a PCIe 4.0 x8 interface and portable device dependent display outputs.

Specification Differences

The following table summarizes only the fields where the two AMD GPUs differ in their recorded specifications.

| Field | AMD Radeon Pro W6600X | AMD Radeon RX 6650M |

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

| Generation | Radeon Pro Mac (Navi II Series) | Navi Mobile (RX 6000M) |

| Boost Clock | 2479 MHz | 2416 MHz |

| Game Clock | Not specified | 2222 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 |

| Texture Mapping Units | 128 | 112 |

| Ray Tracing Cores | 32 | 28 |

| Pixel Rate | 158.7 GPixel/s | 154.6 GPixel/s |

| Texture Rate | 317.3 GTexel/s | 270.6 GTexel/s |

| FP32 Performance | 10.15 TFLOPS | 8.659 TFLOPS |

| FP16 Performance | 20.31 TFLOPS (2:1) | 17.32 TFLOPS (2:1) |

| Slot Width | Dual-slot | IGP |

| Power Connectors | Not specified | None |

| Suggested PSU | 300 W | Not specified |

| Bus Interface | Apple MPX | PCIe 4.0 x8 |

| Display Outputs | No outputs | Portable Device Dependent |

| Release Date | 2021-08-02 | 2022-01-03 |

| Predecessor | Not specified | Polaris Mobile |

| Launch MSRP | 699 USD | Not specified |

| Geekbench Metal Score | 107342 | Not recorded |

| Geekbench OpenCL Score | Not recorded | 65800 |

| Geekbench Vulkan Score | Not recorded | 77735 |

| Average Benchmark Score | 107342 | 71768 |

| Percentile vs All GPUs | 94 | 91 |