AMD Radeon PRO W6800 vs AMD Radeon RX 6650M XT Comparison

The Verdict

The AMD Radeon PRO W6800 and AMD Radeon RX 6650M XT occupy entirely different corners of the GPU landscape, and the benchmark data reflects that separation clearly. The PRO W6800 is a workstation-class board built on the full Navi 21 die, while the RX 6650M XT is a mobile part based on the smaller Navi 23 chip. In the only directly comparable benchmark recorded in the database, Geekbench OpenCL, the PRO W6800 scores 121,808 against the RX 6650M XT's 76,904, a delta of 58.4% in favor of the workstation card. That is not a close contest; it is a generational and class gap expressed in raw compute throughput.

Who should pick which? The PRO W6800 is the obvious choice for desktop workstation workloads that demand large memory capacity, high FP32 throughput, and multiple display outputs. Its 32 GB of GDDR6 memory, 512.0 GB/s of bandwidth, and 17.83 TFLOPS FP32 performance place it in the 96th percentile of all GPUs in the database. The RX 6650M XT, by contrast, is a mobile chip with 8 GB of memory and 9.896 TFLOPS FP32, landing in the 91st percentile. It suits portable systems where power draw and physical footprint matter more than raw compute. The data shows no scenario where the RX 6650M XT outperforms the PRO W6800 in the recorded benchmarks, so for any compute-heavy task, the workstation card wins outright.

FAQ

Q: How much faster is the AMD Radeon PRO W6800 than the RX 6650M XT in OpenCL?

A: The PRO W6800 scores 121,808 in Geekbench OpenCL, while the RX 6650M XT scores 76,904. That is a 58.4% advantage for the PRO W6800.

Q: Which GPU has more memory and bandwidth?

A: The PRO W6800 has 32 GB of GDDR6 on a 256-bit bus, yielding 512.0 GB/s. The RX 6650M XT has 8 GB of GDDR6 on a 128-bit bus, yielding 256.0 GB/s. The PRO W6800 doubles the bandwidth and quadruples the capacity.

Q: Are both GPUs based on the same architecture?

A: Yes, both use RDNA 2.0 and are fabricated at TSMC on a 7 nm process. They also share the same DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4 API support.

Q: What is the power draw difference?

A: The PRO W6800 has a TDP of 250 W and requires a 600 W suggested PSU, while the RX 6650M XT has a TDP of 120 W and uses no external power connectors, being an integrated mobile part.

Q: Which GPU ranks higher among all GPUs in the database?

A: The PRO W6800 sits in the 96th percentile, while the RX 6650M XT sits in the 91st percentile. The PRO W6800 also has a higher average benchmark score: 135,396 versus 76,904.

Q: Does the RX 6650M XT have any advantage in clock speeds?

A: Yes, the mobile chip has a higher base clock of 2068 MHz and a boost clock of 2416 MHz, compared to the PRO W6800's 1575 MHz base and 2322 MHz boost. The RX 6650M XT also lists a game clock of 2162 MHz, which the PRO W6800 does not specify.

Architecture Differences

Both GPUs are built on RDNA 2.0 and use TSMC's 7 nm process, but the silicon underneath is very different. The PRO W6800 uses the Navi 21 chip, a large 520 mm² die with 26,800 million transistors and a transistor density of 51.5M per mm². The RX 6650M XT uses Navi 23, a 237 mm² die with 11,060 million transistors and a density of 46.7M per mm². That means the PRO W6800 packs more than twice the die area and more than double the transistor count, which explains its substantial compute advantage.

The execution resources scale accordingly. The PRO W6800 has 3840 shading units, 240 texture mapping units, 96 ROPs, and 60 ray tracing cores. The RX 6650M XT has 2048 shading units, 128 TMUs, 64 ROPs, and 32 RT cores. Every compute-related count is roughly 1.8 to 1.9 times higher on the workstation part. The pixel rate tells the same story: 222.9 GPixel/s for the PRO W6800 versus 154.6 GPixel/s for the RX 6650M XT. Texture rate is 557.3 GTexel/s against 309.2 GTexel/s. FP32 throughput is 17.83 TFLOPS versus 9.896 TFLOPS, and FP16 is 35.67 TFLOPS (2:1) versus 19.79 TFLOPS (2:1).

The memory subsystem also diverges sharply. The PRO W6800 uses a 256-bit bus with 32 GB of GDDR6, while the RX 6650M XT uses a 128-bit bus with 8 GB. Both run memory at 2000 MHz with 16 Gbps effective speed, but the wider bus gives the PRO W6800 double the bandwidth. The PRO W6800 is a dual-slot desktop card with 6x mini-DisplayPort 1.4a outputs, while the RX 6650M XT is an IGP with display outputs dependent on the portable device. The PRO W6800 connects via PCIe 4.0 x16, the RX 6650M XT via PCIe 4.0 x8.

Specification Differences

The two cards differ in nearly every specification field. The PRO W6800 has a base clock of 1575 MHz and a boost clock of 2322 MHz, while the RX 6650M XT runs at 2068 MHz base and 2416 MHz boost, with a game clock of 2162 MHz. Despite the mobile chip's higher clocks, the PRO W6800 still dominates in throughput due to its larger execution engine.

Memory capacity is 32 GB versus 8 GB, bus width is 256 bit versus 128 bit, and bandwidth is 512.0 GB/s versus 256.0 GB/s. Shading units, TMUs, ROPs, and RT cores are all substantially higher on the PRO W6800. Pixel rate and texture rate follow suit. TDP is 250 W for the desktop card versus 120 W for the mobile part. The PRO W6800 requires a 600 W suggested PSU and uses 1x 6-pin plus 1x 8-pin power connectors; the RX 6650M XT has no external power connectors and no suggested PSU listed.

Form factor and display outputs also differ. The PRO W6800 is dual-slot with dimensions of 267 mm length, 120 mm height, and 50 mm width, offering 6x mini-DisplayPort 1.4a. The RX 6650M XT is an IGP with no dimensions listed and portable-device-dependent display outputs. The PRO W6800 was released on 2021-06-07 with a launch MSRP of 2,249 USD, while the RX 6650M XT launched on 2022-01-03 with no MSRP recorded. Both are end-of-life, and both share the same API support: DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Head-to-Head Benchmarks

The database records one head-to-head benchmark between these two GPUs: Geekbench OpenCL. The PRO W6800 scores 121,808, and the RX 6650M XT scores 76,904. The PRO W6800 wins with a delta of 58.4%. That is the only direct comparison available, and it is decisive.

For context, the PRO W6800's average benchmark score across all recorded tests is 135,396, which places it near the NVIDIA A10M at 135,230 (0.1% ahead) and the NVIDIA RTX 4000 Ada Generation at 135,218 (0.1% ahead). It also sits slightly above the AMD Radeon Pro W6800X Duo at 135,774 (0.3% behind) and the AMD Radeon PRO V620 at 136,472 (0.8% behind). The RX 6650M XT, with an average score of 76,904, is just 1% behind the NVIDIA GeForce RTX 5090 D at 77,712, and 2.6% behind the AMD Radeon RX 6850M XT at 78,940. It trails the NVIDIA Tesla P100 PCIe 12 GB by 3.1% and the 16 GB version by 3.4%.

The OpenCL result is the only direct win recorded, and it goes to the PRO W6800. The data shows no benchmark where the RX 6650M XT takes the lead. The 58.4% delta in OpenCL is consistent with the massive architectural gap between a 520 mm² workstation chip and a 237 mm² mobile chip. The PRO W6800's higher transistor count, double the memory bandwidth, and nearly double the FP32 throughput all point in the same direction. For anyone comparing these two, the verdict is clear: the PRO W6800 is the far more capable compute device, while the RX 6650M XT is a power-efficient mobile alternative with a much smaller footprint.