AMD Radeon Pro W6800X vs AMD Radeon RX 6650M Comparison

FAQ

Q: Which GPU has the higher average benchmark score?

A: The AMD Radeon Pro W6800X records an average benchmark score of 160,671, while the AMD Radeon RX 6650M scores 71,768. The W6800X sits at the 97th percentile of all GPUs, whereas the RX 6650M is at the 91st percentile.

Q: How do the two GPUs compare in Geekbench OpenCL performance?

A: In the only head-to-head benchmark available, Geekbench OpenCL, the W6800X scores 124,498 against 65,800 for the RX 6650M. This represents an 89.2% advantage for the desktop Pro card.

Q: What are the memory specifications for each card?

A: The W6800X has 32 GB of GDDR6 memory on a 256-bit bus, delivering 512.0 GB/s of bandwidth. The RX 6650M has 8 GB of GDDR6 memory on a 128-bit bus, providing 224.0 GB/s of bandwidth.

Q: Which GPU has higher clock speeds?

A: The RX 6650M has a base clock of 2068 MHz and a boost clock of 2416 MHz, compared to the W6800X's 1800 MHz base and 2087 MHz boost. However, the W6800X has significantly more processing units.

Q: What is the thermal design power for each card?

A: The W6800X has a TDP of 200 W, while the RX 6650M has a TDP of 120 W. The W6800X also lists a suggested power supply of 550 W, whereas the mobile card has no suggested PSU rating.

Q: Do both GPUs support the same API feature set?

A: Yes, both cards support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Neither has tensor cores listed, and both are based on the RDNA 2.0 architecture.

Where Each One Wins

The AMD Radeon Pro W6800X wins decisively in raw compute workloads. Its Geekbench OpenCL score of 124,498 is almost double the RX 6650M's 65,800, and its average benchmark score of 160,671 places it far above the mobile part's 71,768. The W6800X also wins in the percentile ranking, sitting at 97 versus 91 for the RX 6650M. This makes the Pro card the clear choice for compute-heavy tasks such as rendering, scientific simulation, and large-scale data processing where memory capacity and bandwidth matter.

The RX 6650M holds advantages in efficiency and form factor. It operates at a 120 W TDP with no external power connectors, making it suitable for thin-and-light gaming laptops. Its boost clock of 2416 MHz is higher than the W6800X's 2087 MHz, and its base clock of 2068 MHz also exceeds the desktop card's 1800 MHz. For mobile gaming at 1080p, the RX 6650M provides a balanced feature set with ray tracing capabilities and 8 GB of GDDR6 memory, which is adequate for most current titles.

In terms of architectural efficiency, the RX 6650M achieves a transistor density of 46.7M per mm² on a 237 mm² die, compared to the W6800X's 51.5M per mm² on a 520 mm² die. The smaller chip allows for lower power draw and simpler cooling solutions, which is essential for portable devices. The W6800X, by contrast, uses a quad-slot cooler with Apple MPX power connectors, indicating a workstation-oriented design that prioritizes performance over size.

The head-to-head benchmark shows only one test, Geekbench OpenCL, where the W6800X wins. There is no recorded Geekbench Metal or Vulkan result for the RX 6650M, nor a Metal result for the W6800X, so the comparison is limited to OpenCL. Nevertheless, the 89.2% delta in that single test is substantial and consistent with the overall average score gap.

Architecture Differences

Both GPUs use the RDNA 2.0 architecture and are fabricated on TSMC's 7 nm process node. However, they employ different chips: the W6800X uses Navi 21, a large desktop die, while the RX 6650M uses Navi 23, a smaller mobile-oriented die. The transistor counts reflect this: the W6800X packs 26,800 million transistors on a 520 mm² die, while the RX 6650M has 11,060 million transistors on a 237 mm² die.

The W6800X belongs to the Radeon Pro Mac (Navi II Series) generation, whereas the RX 6650M is part of the Navi Mobile (RX 6000M) generation. The desktop card has a transistor density of 51.5M per mm², slightly higher than the mobile chip's 46.7M per mm². This density difference suggests the Navi 21 chip uses a more compact layout despite its larger size.

The mobile RX 6650M has a predecessor listed as Polaris Mobile, while the W6800X has no predecessor or successor recorded. Both cards share the same API support: DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Neither card lists tensor cores, which is typical for RDNA 2.0 parts that rely on shader-based compute.

The bus interface differs significantly: the W6800X uses Apple MPX, a proprietary connection, while the RX 6650M uses PCIe 4.0 x8. This reflects their target platforms: the Pro card is designed for Apple Mac Pro systems, while the mobile card is for standard laptops. The display outputs also differ, with the W6800X offering 1x HDMI 2.1 and 4x Thunderbolt, while the RX 6650M's outputs are portable device dependent.

Specification Differences

The following specifications differ between the two GPUs:

• Shading Units: 3840 (W6800X) vs 1792 (RX 6650M)
• TMUs: 240 vs 112
• ROPs: 96 vs 64
• Ray Tracing Cores: 60 vs 28
• Base Clock: 1800 MHz vs 2068 MHz
• Boost Clock: 2087 MHz vs 2416 MHz
• Game Clock: not listed vs 2222 MHz
• Memory Clock: 2000 MHz (16 Gbps effective) vs 1750 MHz (14 Gbps effective)
• Memory Size: 32 GB vs 8 GB
• Memory Bus Width: 256 bit vs 128 bit
• Memory Bandwidth: 512.0 GB/s vs 224.0 GB/s
• Pixel Rate: 200.4 GPixel/s vs 154.6 GPixel/s
• Texture Rate: 500.9 GTexel/s vs 270.6 GTexel/s
• FP32 Performance: 16.03 TFLOPS vs 8.659 TFLOPS
• FP16 Performance: 32.06 TFLOPS (2:1) vs 17.32 TFLOPS (2:1)
• TDP: 200 W vs 120 W
• Slot Width: Quad-slot vs IGP
• Power Connectors: Apple MPX vs None
• Suggested PSU: 550 W vs not listed
• Bus Interface: Apple MPX vs PCIe 4.0 x8
• Display Outputs: 1x HDMI 2.1, 4x Thunderbolt vs Portable Device Dependent
• Dimensions: 267 mm length, 120 mm height vs not listed
• Release Date: 2021-08-02 vs 2022-01-03
• Launch MSRP: 2,799 USD vs not listed
• Predecessor: not listed vs Polaris Mobile

The W6800X doubles the RX 6650M in shading units, TMUs, and ray tracing cores, and it has 50% more ROPs. These differences translate directly into the performance gap seen in compute benchmarks.

Head-to-Head Benchmarks

The only recorded head-to-head benchmark is Geekbench OpenCL. In this test, the AMD Radeon Pro W6800X scores 124,498, while the AMD Radeon RX 6650M scores 65,800. The delta is 89.2% in favor of the W6800X. This is a massive margin, reflecting the Pro card's higher shading unit count (3840 vs 1792), larger memory bandwidth (512.0 GB/s vs 224.0 GB/s), and greater FP32 throughput (16.03 TFLOPS vs 8.659 TFLOPS).

Looking at the average benchmark scores, the W6800X records 160,671, which is 124% higher than the RX 6650M's 71,768. The W6800X's nearest rivals in the database include the NVIDIA A100 PCIe 40 GB (162,504, delta -1.1%), the AMD Radeon PRO W7800 (164,894, delta -2.6%), the NVIDIA RTX A5500 (165,217, delta -2.8%), and the NVIDIA RTX 4500 Ada Generation (166,094, delta -3.3%). These deltas show the W6800X sits just below a cluster of high-end workstation cards, with differences under 3.5%.

The RX 6650M's nearest rivals are notably lower in absolute terms: the NVIDIA TITAN X Pascal (72,098, delta -0.5%), the AMD Radeon Pro Vega 64 (72,379, delta -0.8%), the AMD Radeon RX 6600 LE (70,829, delta 1.3%), and the AMD Radeon Vega Frontier Edition (73,370, delta -2.2%). The mobile card is sandwiched between these desktop parts, with deltas all under 2.2%. This indicates the RX 6650M performs at a level comparable to older high-end desktop GPUs, which is respectable for a mobile part but far below the modern workstation-class W6800X.

The W6800X also holds a 97th percentile ranking versus the RX 6650M's 91st percentile. While both are in the top decile of all GPUs, the gap between the 91st and 97th percentiles is significant, as the upper tail of GPU performance is steep. The W6800X's Geekbench Metal score of 196,844 further underscores its compute strength, although no comparable Metal result exists for the RX 6650M.

In summary, the W6800X wins the only direct benchmark by a wide margin, and its average score places it among top-tier workstation accelerators. The RX 6650M, while competitive with older desktop flagships, operates in a different performance class altogether.