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

FAQ

Q: Which GPU has the higher average benchmark score?

A: The AMD Radeon Pro W6800X Duo has an average benchmark score of 135774, placing it in the 96th percentile of all GPUs. The AMD Radeon RX 6650M records an average score of 71768, which places it in the 91st percentile.

Q: How large is the performance gap in the OpenCL benchmark?

A: In the Geekbench OpenCL test, the Radeon Pro W6800X Duo scores 124335 against the RX 6650M's 65800. This represents an 89% advantage for the W6800X Duo, the largest head-to-head delta between the two cards.

Q: Does the Radeon RX 6650M win in any benchmark?

A: No. The head-to-head data records two benchmark tests, OpenCL and Vulkan, and the Radeon Pro W6800X Duo wins both. The W6800X Duo leads by 89% in OpenCL and by 61.6% in Vulkan.

Q: What is the memory configuration difference?

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

Q: What are the power requirements for each card?

A: The Radeon Pro W6800X Duo has a 400 W TDP and a suggested PSU of 800 W. The Radeon RX 6650M has a 120 W TDP and does not have a suggested PSU listed, as it is an integrated GPU for mobile platforms.

Q: How do the closest rivals compare for each GPU?

A: For the W6800X Duo, the nearest rival is the AMD Radeon PRO W6800 with an average score of 135396, a 0.3% difference. For the RX 6650M, the closest rival is the NVIDIA TITAN X Pascal with an average score of 72098, a 0.5% difference.

The Verdict

The data is unambiguous: the AMD Radeon Pro W6800X Duo is the dominant part in every recorded measurement. It wins both head-to-head benchmark tests, holds a higher average score, and sits in a higher percentile of all GPUs. Anyone choosing between these two for compute-heavy workloads should select the W6800X Duo, provided the system can accommodate its quad-slot footprint and power demands.

The Radeon RX 6650M is not without merit, but its role is entirely different. As a mobile IGP with a 120 W TDP, it is designed for portable systems where power and space are constrained. The data shows it performs well for its class, sitting in the 91st percentile, and its nearest rivals include desktop cards like the NVIDIA TITAN X Pascal and the AMD Radeon Pro Vega 64, which are separated by less than 1%. For a laptop user who needs solid OpenCL and Vulkan performance without the thermal and physical overhead of a discrete desktop card, the RX 6650M is a reasonable choice.

However, the verdict for raw performance is clear. The W6800X Duo delivers roughly double the OpenCL score and a 61.6% higher Vulkan score. It also offers four times the memory capacity and more than double the memory bandwidth. The specification sheet alone explains the performance gap: the W6800X Duo has more than twice the shading units, TMUs, ROPs, and RT cores. This is a professional workstation card with a 400 W TDP and an Apple MPX interface, while the RX 6650M is a mobile part with a PCIe 4.0 x8 interface and no power connectors.

Head-to-Head Benchmarks

The recorded head-to-head data contains two tests, and the W6800X Duo wins both with substantial margins.

In Geekbench OpenCL, the W6800X Duo scores 124335 against the RX 6650M's 65800. The 89% delta is the largest gap in any comparison. This test typically stresses raw compute throughput, and the W6800X Duo's 3840 shading units against 1792, along with its 15.11 TFLOPS FP32 versus 8.659 TFLOPS, explains the outcome. The RX 6650M's score is still respectable for a mobile GPU, but it is less than 53% of the W6800X Duo's output.

In Geekbench Vulkan, the W6800X Duo scores 125622, while the RX 6650M records 77735. The delta here is 61.6%. Vulkan workloads tend to scale with both compute and memory bandwidth, and the W6800X Duo's 512.0 GB/s versus 224.0 GB/s gives it a clear advantage. The RX 6650M's Vulkan score is actually higher than its OpenCL score, suggesting that the mobile GPU handles the Vulkan API more efficiently, but it still trails the W6800X Duo by a wide margin.

The average benchmark scores reinforce this picture. The W6800X Duo averages 135774 across all recorded tests, while the RX 6650M averages 71768. That is a difference of roughly 89% in favor of the W6800X Duo, consistent with the OpenCL head-to-head result. The percentile ranking also separates them: 96th versus 91st. While both are above the 90th percentile, the W6800X Duo sits at the top end of the database, and the RX 6650M is near the boundary of the top decile.

Specification Differences

The two cards diverge sharply on nearly every core specification. The W6800X Duo uses the Navi 21 chip with 26,800 million transistors on a 520 mm² die, while the RX 6650M uses the Navi 23 chip with 11,060 million transistors on a 237 mm² die. Both are fabricated on a 7 nm process at TSMC, and the transistor density is similar: 51.5M per mm² for the W6800X Duo versus 46.7M per mm² for the RX 6650M.

Clock speeds favor the mobile part in raw frequency. The RX 6650M has a base clock of 2068 MHz and a boost clock of 2416 MHz, with a game clock of 2222 MHz. The W6800X Duo has a base clock of 1800 MHz and a boost clock of 1967 MHz. Despite lower clocks, the W6800X Duo achieves higher throughput because of its much larger execution engine.

Memory is a major differentiator. The W6800X Duo has 32 GB of GDDR6 on a 256-bit bus with 512.0 GB/s bandwidth and 2000 MHz memory clock (16 Gbps effective). The RX 6650M has 8 GB of GDDR6 on a 128-bit bus with 224.0 GB/s bandwidth and 1750 MHz memory clock (14 Gbps effective). The W6800X Duo offers four times the capacity and more than double the bandwidth.

The compute units also differ significantly. The W6800X Duo has 3840 shading units, 240 TMUs, 96 ROPs, and 60 RT cores. The RX 6650M has 1792 shading units, 112 TMUs, 64 ROPs, and 28 RT cores. In every category, the W6800X Duo has at least double the resources, and in ROPs, the advantage is 50% more.

Pixel and texture rates follow the same pattern. The W6800X Duo delivers 188.8 GPixel/s and 472.1 GTexel/s, while the RX 6650M delivers 154.6 GPixel/s and 270.6 GTexel/s. FP32 compute is 15.11 TFLOPS for the W6800X Duo versus 8.659 TFLOPS for the RX 6650M, and FP16 is 30.21 TFLOPS versus 17.32 TFLOPS, both at a 2:1 ratio.

Power and physical attributes are starkly different. The W6800X Duo has a 400 W TDP, is a quad-slot card, measures 267 mm in length and 120 mm in height, and uses an Apple MPX bus interface. The RX 6650M has a 120 W TDP, is an IGP with no slot width, has no power connectors, and uses a PCIe 4.0 x8 interface. The W6800X Duo suggests an 800 W PSU, while the RX 6650M has no PSU recommendation. Display outputs also differ: the W6800X Duo offers 1x HDMI 2.1 and 4x Thunderbolt, while the RX 6650M's outputs are portable device dependent.

Architecture Differences

Both GPUs are built on RDNA 2.0 architecture and are manufactured by AMD at TSMC on a 7 nm process. They share the same DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4 API support. Neither has tensor cores. The architectural DNA is the same, but the implementations are scaled for different purposes.

The W6800X Duo belongs to the Radeon Pro Mac generation under the Navi II series, while the RX 6650M belongs to the Navi Mobile generation under the RX 6000M series. The chip designs are separate: Navi 21 for the W6800X Duo and Navi 23 for the RX 6650M. This explains the massive difference in transistor count and die size. The W6800X Duo packs 26,800 million transistors, more than 2.4 times the RX 6650M's 11,060 million. The die area is 520 mm² versus 237 mm², a 2.2 times difference.

The RT core count is a direct architectural scaling. The W6800X Duo has 60 RT cores, while the RX 6650M has 28. Both support hardware-accelerated ray tracing, but the W6800X Duo has more than double the RT throughput capability. The shading unit count, 3840 versus 1792, follows the same ratio.

The memory architecture also reflects the different positioning. The W6800X Duo uses a 256-bit bus with 512.0 GB/s bandwidth, while the RX 6650M uses a 128-bit bus with 224.0 GB/s. The effective memory clock is higher on the W6800X Duo: 16 Gbps versus 14 Gbps. The RX 6650M's smaller bus and slower memory clock cap its memory throughput, which is a limiting factor for bandwidth-sensitive workloads.

The bus interface differs as well. The W6800X Duo uses Apple MPX, a proprietary interface for Apple's Mac Pro systems, while the RX 6650M uses PCIe 4.0 x8, a standard interface for mobile platforms. This reflects the W6800X Duo's workstation role and the RX 6650M's portable integration.

Where Each One Wins

The Radeon Pro W6800X Duo wins in every recorded benchmark, so its strengths are comprehensive. It is the clear choice for compute-heavy workloads that demand maximum FP32 throughput, large memory capacity, and high bandwidth. The 32 GB frame buffer and 512.0 GB/s bandwidth make it suitable for large datasets, high-resolution rendering, and multi-display configurations with 4x Thunderbolt outputs. Its 400 W TDP and 800 W PSU requirement indicate that this is a desktop workstation card, not a portable solution.

The Radeon RX 6650M wins in the context of power efficiency and form factor. At 120 W TDP with no power connectors, it can operate in thin-and-light laptops. Its 8 GB memory is sufficient for mainstream gaming and productivity tasks, and its 91st percentile ranking shows it is not a weak performer. The RX 6650M's higher clock speeds, 2068 MHz base and 2416 MHz boost, mean it can punch above its weight in frequency-sensitive workloads, even though its absolute scores are lower.

For a desktop workstation with no power or space constraints, the W6800X Duo is the obvious choice. For a mobile system where the GPU must fit within a laptop chassis and a 120 W power budget, the RX 6650M is the only viable option between these two. The data does not show a scenario where the RX 6650M outperforms the W6800X Duo, but it does show that the RX 6650M is a competent mobile GPU in its own right, with a 61.6% Vulkan score that is closer to the desktop card than its OpenCL score suggests.