AMD Radeon Pro W6800X vs AMD Radeon RX 6650M XT Comparison

# AMD Radeon Pro W6800X vs AMD Radeon RX 6650M XT

The AMD Radeon Pro W6800X and AMD Radeon RX 6650M XT represent two very different implementations of RDNA 2.0. The Pro W6800X is a workstation-class, Apple MPX-based card with 32 GB of memory and a 97th percentile ranking among all GPUs. The RX 6650M XT is a mobile part with 8 GB of memory, ranking in the 91st percentile. In the only shared benchmark, Geekbench OpenCL, the Pro W6800X delivers a 61.9% higher score, establishing a clear performance gap that runs through every architectural and specification comparison.

FAQ

Q: Which GPU is faster in Geekbench OpenCL?

A: The AMD Radeon Pro W6800X scores 124,498 versus 76,904 for the AMD Radeon RX 6650M XT, a 61.9% advantage.

Q: How much memory does each card have?

A: The Pro W6800X has 32 GB of GDDR6 on a 256-bit bus, while the RX 6650M XT has 8 GB of GDDR6 on a 128-bit bus.

Q: What are the transistor counts?

A: The Pro W6800X uses 26,800 million transistors on a 520 mm² die, while the RX 6650M XT uses 11,060 million transistors on a 237 mm² die.

Q: Do both cards support the same APIs?

A: Yes, both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: What is the TDP difference?

A: The Pro W6800X is rated at 200 W, while the RX 6650M XT is rated at 120 W.

Q: Which GPU has a higher percentile ranking?

A: The Pro W6800X sits in the 97th percentile of all GPUs, compared to the 91st percentile for the RX 6650M XT.

Architecture Differences

Both GPUs are built on RDNA 2.0 architecture and the same 7 nm TSMC process, but they diverge sharply in scale and intent. The Pro W6800X uses the Navi 21 chip, a full-size workstation die measuring 520 mm² with 26,800 million transistors. The RX 6650M XT uses Navi 23, a compact mobile chip at 237 mm² with 11,060 million transistors. Transistor density is similar, 51.5 million per mm² versus 46.7 million per mm², but the raw resources differ by more than two to one.

The Pro W6800X fields 3840 shading units, 240 texture mapping units, 96 raster operation units, and 60 ray tracing cores. The RX 6650M XT has 2048 shading units, 128 TMUs, 64 ROPs, and 32 ray tracing cores. Every compute block is roughly doubled on the workstation card, which explains why its FP32 throughput reaches 16.03 TFLOPS against 9.896 TFLOPS for the mobile part. FP16 rates follow the same 2:1 ratio pattern: 32.06 TFLOPS versus 19.79 TFLOPS.

Memory architecture reinforces the gap. The Pro W6800X carries 32 GB of GDDR6 across a 256-bit interface, producing 512.0 GB/s of bandwidth. The RX 6650M XT has 8 GB of GDDR6 on a 128-bit bus, yielding 256.0 GB/s. Both operate at 2000 MHz (16 Gbps effective), so the bandwidth difference comes entirely from the wider bus on the workstation card.

Clock behavior is the one area where the mobile part leads. The RX 6650M XT has a base clock of 2068 MHz, a game clock of 2162 MHz, and a boost clock of 2416 MHz. The Pro W6800X runs at a base of 1800 MHz and boosts to 2087 MHz. Even with lower clocks, the Pro W6800X produces higher pixel and texture rates: 200.4 GPixel/s versus 154.6 GPixel/s, and 500.9 GTexel/s versus 309.2 GTexel/s. The shader and memory advantages overwhelm the clock deficit.

Physical design and power delivery separate the two further. The Pro W6800X is a quad-slot card using Apple MPX power connectors, with a suggested PSU of 550 W and a TDP of 200 W. It measures 267 mm in length and 120 mm in height. The RX 6650M XT is an integrated graphics package (IGP) with no power connectors, a 120 W TDP, and no listed dimensions. The workstation card targets desktop Mac systems, while the mobile part is designed for portable devices with device-dependent display outputs.

Head-to-Head Benchmarks

The database contains one direct comparison between these two GPUs: Geekbench OpenCL. The Pro W6800X scores 124,498, and the RX 6650M XT scores 76,904. That is a 61.9% advantage for the workstation card. To put it in context, the RX 6650M XT would need to gain more than 47,000 points to match the Pro W6800X, a gap roughly equivalent to 60% of its entire score. No other benchmark test was recorded for both cards, so this single data point defines the head-to-head relationship.

The average benchmark scores tell a similar story. The Pro W6800X averages 160,671 across all recorded tests, while the RX 6650M XT averages 76,904. That places the Pro W6800X in the 97th percentile of all GPUs and the RX 6650M XT in the 91st. The Pro W6800X's nearest rivals in the database are the NVIDIA A100 PCIe 40 GB (162,504, 1.1% higher), the AMD Radeon PRO W7800 (164,894, 2.6% higher), the NVIDIA RTX A5500 (165,217, 2.8% higher), and the NVIDIA RTX 4500 Ada Generation (166,094, 3.3% higher). The Pro W6800X trails the closest of these by only 1.1%, placing it within striking distance of top-tier workstation accelerators.

The RX 6650M XT's nearest rivals are much closer to its own score. The NVIDIA GeForce RTX 5090 D sits 1% higher at 77,712, the AMD Radeon RX 6850M XT is 2.6% higher at 78,940, and the NVIDIA Tesla P100 PCIe 12 GB and 16 GB versions sit 3.1% and 3.4% higher at 79,396 and 79,605 respectively. The mobile card sits comfortably in the upper tier of laptop GPUs but far below the workstation class.

The Geekbench Metal result for the Pro W6800X is 196,844, which is not compared directly to the RX 6650M XT because the mobile card has no recorded Metal score. Still, that figure shows the workstation card's compute capability extends beyond OpenCL and reinforces its strong standing in the 97th percentile.

The Verdict

The data points to a simple conclusion: the AMD Radeon Pro W6800X is the far more capable GPU, and the AMD Radeon RX 6650M XT is a competent but smaller mobile part. The 61.9% OpenCL lead, the 4x memory capacity advantage, the 2x memory bandwidth advantage, and the 62% higher FP32 throughput make the Pro W6800X the clear choice for compute-heavy workstation workloads.

The RX 6650M XT does have its own strengths. It pulls less power at 120 W versus 200 W, it runs at higher clocks, and it is designed for portable systems where the Pro W6800X's quad-slot Apple MPX form factor is physically impossible. For laptop users, the RX 6650M XT is the only one of these two that fits at all.

However, the performance delta is too large to ignore. The Pro W6800X produces 200.4 GPixel/s and 500.9 GTexel/s, against 154.6 GPixel/s and 309.2 GTexel/s for the RX 6650M XT. It has 60 ray tracing cores versus 32. It has 3840 shading units versus 2048. Every metric that matters for rendering and compute favors the workstation card, often by a wide margin.

The launch MSRP for the Pro W6800X was 2,799 USD, and it is now end-of-life. The RX 6650M XT has no recorded launch MSRP and is also end-of-life. Neither card is current production, so availability will depend on remaining stock or the used market.

Specification Differences

| Specification | AMD Radeon Pro W6800X | AMD Radeon RX 6650M XT |

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

| Chip | Navi 21 | Navi 23 |

| 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 | 1800 MHz | 2068 MHz |

| Boost Clock | 2087 MHz | 2416 MHz |

| Game Clock | None | 2162 MHz |

| Memory Size | 32 GB | 8 GB |

| Memory Bus Width | 256 bit | 128 bit |

| Memory Bandwidth | 512.0 GB/s | 256.0 GB/s |

| Shading Units | 3840 | 2048 |

| TMUs | 240 | 128 |

| ROPs | 96 | 64 |

| Ray Tracing Cores | 60 | 32 |

| Pixel Rate | 200.4 GPixel/s | 154.6 GPixel/s |

| Texture Rate | 500.9 GTexel/s | 309.2 GTexel/s |

| FP32 | 16.03 TFLOPS | 9.896 TFLOPS |

| FP16 | 32.06 TFLOPS (2:1) | 19.79 TFLOPS (2:1) |

| TDP | 200 W | 120 W |

| Slot Width | Quad-slot | IGP |

| Power Connectors | Apple MPX | None |

| Suggested PSU | 550 W | None |

| Bus Interface | Apple MPX | PCIe 4.0 x8 |

| Display Outputs | 1x HDMI 2.1, 4x Thunderbolt | Portable Device Dependent |

| Dimensions | 267 mm length, 120 mm height | Not listed |

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

| Predecessor | None | Polaris Mobile |

Both cards share the same architecture, process node, memory type, and API support. The differences are almost entirely in scale, power, and form factor.

Where Each One Wins

The AMD Radeon Pro W6800X wins in every recorded compute benchmark and in nearly every architectural category. It is the stronger choice for workloads that need large memory capacity, high bandwidth, or massive parallel throughput. The 32 GB frame buffer and 512.0 GB/s bandwidth suit large datasets, high-resolution textures, and multi-display rendering. The 60 ray tracing cores and 3840 shading units give it a decisive edge in GPU-accelerated rendering and simulation. Its 97th percentile ranking places it among the top GPUs in the database, close enough to rival the NVIDIA A100 PCIe 40 GB (1.1% behind) and the AMD Radeon PRO W7800 (2.6% behind) to be considered a serious workstation contender.

The AMD Radeon RX 6650M XT wins in power efficiency and portability. Its 120 W TDP is 40% lower than the Pro W6800X's 200 W, and its IGP form factor with no external power connectors makes it suitable for laptops. The higher base and boost clocks, 2068 MHz and 2416 MHz respectively, show a design tuned for power-constrained environments. For mobile gaming or portable compute tasks, the RX 6650M XT delivers 9.896 TFLOPS of FP32 performance, which is respectable for its class. Its 91st percentile ranking and close rivalry with the NVIDIA GeForce RTX 5090 D (1% behind) and AMD Radeon RX 6850M XT (2.6% behind) show it holds its own among mobile GPUs.

The choice comes down to use case. Desktop workstations with Apple MPX support should take the Pro W6800X for its 61.9% OpenCL lead and 4x memory capacity. Portable systems with no room for a quad-slot card must take the RX 6650M XT, accepting the lower compute ceiling in exchange for a 120 W power envelope and integrated design. The data does not present a scenario where the RX 6650M XT outperforms the Pro W6800X in raw performance, but it does present a clear scenario where the RX 6650M XT is the only physically viable option.