AMD Radeon Pro W6600X vs AMD Radeon RX 6650M XT Comparison

FAQ

Q: How do the AMD Radeon Pro W6600X and AMD Radeon RX 6650M XT compare in raw benchmark scores?

A: The database records a single Geekbench score for each card, but they use different test suites. The Pro W6600X scores 107,342 in Geekbench Metal, placing it in the 94th percentile of all GPUs. The RX 6650M XT scores 76,904 in Geekbench OpenCL, placing it in the 91st percentile.

Q: Which card has higher compute throughput?

A: The Pro W6600X leads in FP32 performance with 10.15 TFLOPS versus 9.896 TFLOPS for the RX 6650M XT. The same pattern holds for FP16, where the Pro card achieves 20.31 TFLOPS (2:1) compared to 19.79 TFLOPS (2:1) for the mobile part.

Q: Are the two GPUs built on the same architecture?

A: Yes, both use the RDNA 2.0 architecture with the Navi 23 chip, fabricated on TSMC's 7 nm process. Both have 11,060 million transistors on a 237 mm² die size.

Q: How do their clock speeds differ?

A: The Pro W6600X has a base clock of 2068 MHz and a boost clock of 2479 MHz. The RX 6650M XT shares the same 2068 MHz base clock but boosts to 2416 MHz, with a game clock of 2162 MHz.

Q: What are their memory specifications?

A: Both cards feature 8 GB of GDDR6 memory on a 128-bit bus with 256.0 GB/s bandwidth and 2000 MHz memory clock (16 Gbps effective). There is no difference in memory capacity or bandwidth.

Q: Which card has a better position relative to its nearest rivals?

A: The Pro W6600X sits 0.6% above the Radeon Pro Vega II Duo and 5.4% above the NVIDIA Quadro RTX 6000, but trails the Pro Vega II by 2.1% and the PRO W7900 by 3.1%. The RX 665M XT is 1% behind the RTX 5090 D, 2.6% behind the RX 6850M XT, and roughly 3.1% to 3.4% behind the Tesla P100 variants.

Architecture Differences

Both cards share the same underlying silicon: the Navi 23 chip built on RDNA 2.0 architecture at TSMC's 7 nm node. The transistor count of 11,060 million and die size of 237 mm² are identical, yielding the same transistor density of 46.7M / mm².

The compute resources are also identical in configuration. Each GPU has 2048 shading units, 128 texture mapping units, 64 raster operation units, and 32 ray tracing cores. Neither card has tensor cores. The DirectX support is identical at 12 Ultimate (12_2), as are OpenGL 4.6 and Vulkan 1.4.

The key architectural differences appear in the packaging and integration. The Pro W6600X uses an Apple MPX bus interface and is a dual-slot card with no display outputs. The RX 6650M XT uses PCIe 4.0 x8 and is an integrated graphics processor (IGP) with portable device dependent outputs. The mobile chip has no power connectors, while the Pro card's connector configuration is not specified in the database.

Clock behavior differs significantly. Both start at a 2068 MHz base clock, but the Pro W6600X boosts higher at 2479 MHz versus 2416 MHz for the RX 6650M XT. The mobile part also has a defined game clock of 2162 MHz, a figure not listed for the Pro card.

The production status for both is end-of-life. The Pro W6600X launched on August 2, 2021, as part of the Radeon Pro Mac (Navi II Series) generation. The RX 6650M XT launched on January 3, 2022, in the Navi Mobile (RX 6000M) generation, succeeding the Polaris Mobile lineup.

Where Each One Wins

The Pro W6600X wins in raw compute throughput in every measured category. Its FP32 rate of 10.15 TFLOPS is 2.6% higher than the mobile part's 9.896 TFLOPS. The pixel rate of 158.7 GPixel/s edges out the 154.6 GPixel/s of the RX 6650M XT by 2.7%. Texture rate follows the same pattern: 317.3 GTexel/s versus 309.2 GTexel/s, a 2.6% advantage.

The benchmark data tells a more complex story. The Pro W6600X achieves 107,342 in Geekbench Metal, a test optimized for Apple's Metal API, which aligns with its Mac-oriented design and Apple MPX bus interface. The RX 6650M XT achieves 76,904 in Geekbench OpenCL, a cross-platform test. The percentile rankings show both cards performing well above average: 94th percentile for the Pro card and 91st for the mobile chip.

The Pro W6600X is positioned for professional workstation workloads in Apple ecosystems. Its lack of display outputs suggests it operates as a compute or auxiliary GPU within a Mac Pro chassis, paired with other display-capable hardware. The RX 6650M XT is designed for mobile gaming and portable workstations, with display output dependent on the host device.

The RX 6650M XT wins on integration efficiency. As an IGP with no power connectors, it can be deployed in thinner notebooks where discrete power delivery is impractical. Its PCIe 4.0 x8 interface provides adequate bandwidth for its 8 GB frame buffer while keeping the electrical footprint modest.

Specification Differences

| Specification | AMD Radeon Pro W6600X | AMD Radeon RX 6650M XT |

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

| Boost clock | 2479 MHz | 2416 MHz |

| Game clock | Not specified | 2162 MHz |

| Pixel rate | 158.7 GPixel/s | 154.6 GPixel/s |

| Texture rate | 317.3 GTexel/s | 309.2 GTexel/s |

| FP32 performance | 10.15 TFLOPS | 9.896 TFLOPS |

| FP16 performance | 20.31 TFLOPS (2:1) | 19.79 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 |

| Launch MSRP | 699 USD | Not specified |

| Predecessor | Not specified | Polaris Mobile |

The two cards share identical memory subsystems, shading units, TMUs, ROPs, ray tracing cores, base clock, process node, foundry, transistor count, die size, and API support. The differences are confined to clock speeds, derived performance metrics, physical form factor, and platform integration.

Head-to-Head Benchmarks

The database records only one benchmark score per card, and they use different test suites, so a direct apples-to-apples comparison requires careful interpretation. The Pro W6600X posts 107,342 in Geekbench Metal, while the RX 6650M XT posts 76,904 in Geekbench OpenCL. These numbers are not directly comparable because Metal and OpenCL exercise different code paths and driver stacks.

The Pro W6600X's nearest rival data shows a tight cluster. It sits 0.6% above the AMD Radeon Pro Vega II Duo, which scores 106,750, and 5.4% above the NVIDIA Quadro RTX 6000 at 101,872. It trails the AMD Radeon Pro Vega II, which manages 109,617, by 2.1%, and falls 3.1% short of the AMD Radeon PRO W7900 at 110,725. This places the Pro W6600X in a competitive position against older flagship workstation cards, with the delta percentages all within a single-digit range.

The RX 6650M XT faces a different competitive set. Its 76,904 OpenCL score places it 1% behind the NVIDIA GeForce RTX 5090 D (77,712) and 2.6% behind the AMD Radeon RX 6850M XT (78,940). The NVIDIA Tesla P100 PCIe 12 GB and 16 GB variants both surpass it by 3.1% and 3.4%, respectively, with scores of 79,396 and 79,605.

The compute performance deltas align with the clock speed differences. The Pro W6600X's 2479 MHz boost clock versus 2416 MHz for the mobile part yields a 2.6% advantage in FP32 throughput, matching the percentage difference in texture rate. The pixel rate advantage is slightly larger at 2.7%, reflecting the higher boost clock's impact on raster operations.

Neither card has head-to-head benchmark entries in the database, meaning no direct same-test comparison exists between these two specific GPUs. The recorded wins tally shows zero for each card in this pairing. However, the percentile rankings provide contextual performance: the Pro W6600X at the 94th percentile places it among the top 6% of all GPUs tested, while the RX 6650M XT at the 91st percentile places it in the top 9%.

The power envelope is identical at 120 W TDP for both cards, which is notable given the Pro card's dual-slot workstation form factor versus the mobile IGP design. The Pro W6600X suggests a 300 W power supply, while the mobile part has no suggested PSU figure, reflecting its typical integration into a notebook's power delivery system rather than a standalone PSU requirement.

The release timing shows a five-month gap, with the Pro W6600X arriving August 2, 2021, and the RX 6650M XT following January 3, 2022. Both are now end-of-life products in the database, but they serve distinct market segments: the Pro card targets Apple Mac Pro workstations with its MPX interface and no display outputs, while the RX 6650M XT targets mobile gaming laptops with its PCIe 4.0 x8 interface and portable device dependent displays.