AMD Radeon PRO V620 vs AMD Radeon RX 6650M XT Comparison

# AMD Radeon PRO V620 vs AMD Radeon RX 6650M XT

The database places these two AMD offerings in distinct market segments. The Radeon PRO V620 is a workstation-class part built around the Navi 21 die, while the Radeon RX 6650M XT is a mobile gaming part based on the smaller Navi 23 chip. Their benchmark results place them close in overall compute, yet architectural differences and platform positioning lead to clear trade-offs.

Head-to-Head Benchmarks

In the recorded OpenCL benchmark, the AMD Radeon PRO V620 scores 128,580 points. The AMD Radeon RX 6650M XT scores 76,904 points. This is a decisive 67.2% advantage for the PRO V620 in raw compute throughput. The margin is substantial, not a marginal one. These are the two benchmark entries available in the database for these parts.

The performance gap is consistent with the relative positioning of the two chips. The PRO V620 is a full Navi 21 implementation with 4,608 shading units and a 256-bit memory bus. The RX 6650M XT is a trimmed Navi 23 part with 2,048 shading units and a 128-bit bus. A wider execution engine and double the shading resources have a predictable impact on raw compute workloads.

However, the comparison does not end there. The RX 6650M XT posts a score of 76,904 in the same OpenCL test, which is a 40% deficit relative to the PRO V620. The data indicates the PRO part is the stronger silicon for general compute. The RX 6650M XT still holds its own in its mobile segment, but it does not challenge the workstation part.

FAQ

Q: What is the architectural generation of the AMD Radeon PRO V620?

A: The PRO V620 belongs to the Radeon Pro Navi (Navi II Series) generation, built on the RDNA 2.0 architecture. The RX 6650M XT belongs to the Navi Mobile (RX 6000M) generation, also using RDNA 2.0.

Q: How many shading units do these cards have?

A: The PRO V620 has 4,608 shading units. The RX 6650M XT has 2,048. This 2,560 shading unit gap is a primary reason for the compute score difference.

Q: What are the memory specifications?

A: The PRO V620 pairs 32 GB of GDDR6 on a 256-bit bus, for a bandwidth of 512.0 GB/s. The RX 6650M XT has 8 GB of GDDR6 on a 128-bit bus, reaching 256.0 GB/s. That is a 2x bus width and a 2x memory capacity advantage for the PRO part.

Q: Do these parts support modern APIs?

A: Both are mature RDNA 2 parts. The PRO V620 lists DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4 support. The RX 6650M XT matches with DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: What is each card's thermal design power?

A: The PRO V620 is rated for a 300 W TDP, while the RX 6650M XT is rated for 120 W. These values reflect their respective slots: a dual-slot workstation board versus a mobile IGP part.

Architecture Differences

The architectural gap between these two chips is a matter of die size and configuration. The PRO V620 uses the Navi 21 die, which is a 520 mm² piece of silicon with 26,800 million transistors, built on TSMC's 7 nm process. Its transistor density is 51.5M per mm².

The RX 6650M XT, on the other hand, is based on the Navi 23 die. This piece measures 237 mm², with 11,060 million transistors, also at 7 nm at TSMC. Its transistor density is 46.7M per mm². The PRO V620 is a larger die, not only in physical size but also in transistor count, which explains its ability to feed significantly more compute units.

The front-end of the chip also differs. The PRO V620 has 288 texture mapping units and 128 render output processors. The RX 6650M XT has 128 texture mapping units and 64 ROPs. The RDNA 2 arrangement gives each of these parts 72 ray accelerators on the PRO V620 and 32 ray accelerators on the RX 6650M XT. The PRO V620 is clearly a higher tier of silicon with more of every resource.

Clock speeds also tell a story. The PRO V620 runs a base clock of 1825 MHz with a boost of 2200 MHz. The RX 6650M XT has a base of 2068 MHz, a game clock of 2162 MHz, and a boost of 2416 MHz. Even though the RX part has a higher clock, it can't close the silicon gap: the PRO V620 has more CUs, TMUs, ROPs, and memory bandwidth.

The PRO uses a 2x 8-pin power connector and has a dual-slot width, typical for a high-power workstation part. The RX 6650M XT is an integrated graphics processor with no power connectors and a slot width marked as an IGP. These details match their intended usage, not their performance metrics.

The Verdict

From the data alone, the AMD Radeon PRO V620 is the clear winner for raw compute. Its OpenCL score is 67.2% higher than the RX 6650M XT's score. The V620's advantage in shading units, memory bus width, and memory capacity is decisive in every recorded benchmark. It is the part to choose if the workload is compute-bound and can use the full, massive Navi 21 die.

The AMD Radeon RX 6650M XT remains a very competent mobile part. Its 2,048 shaders, 128 TMUs, 64 ROPs, and 256 GB/s of bandwidth are in line with its Navi 23 heritage. The benchmark results show this, but it's a full 40% lower than the PRO. The RX 6650M XT would be the best fit for a thin, power-conscious mobile chassis where the CPU is doing the heavy lifting, while the GPU can still deliver robust gaming performance at a lower 120 W TDP.

Specification Differences

| Specification | AMD Radeon PRO V620 | AMD Radeon RX 6650M XT |

|---|---|

| Chip | Navi 21 | Navi 23 |

| Architecture | RDNA 2.0 | RDNA 2.0 |

| Process node | 7 nm (TSMC) | 7 nm (TSMC) |

| Transistors | 26,800 million | 11,060 million |

| Die size | 520 mm² | 237 mm² |

| Transistor density | 51.5M / mm² | 41.7M / mm² |

| Base clock | 1825 MHz | 2068 MHz |

| Boost clock | 2200 MHz | 2416 MHz |

| Memory | 32 GB GDDR6 | 8 GB GDDR6 |

| Memory bus | 256-bit | 128-bit |

| Memory bandwidth | 512.0 GB/s | 256.0 GB/s |

| Shading units | 4608 | 2048 |

| Ray accelerators | 72 | 32 |

| ROPs | 128 | 64 |

| Texture units | 64 | 128 |

| Pixel rate | 281.6 GPixel/s | 154.6 GPixel/s |

| Texture rate | 633.6 GTexel/s | 309.2 GTexel/s |

| FP32 | 20.28 TFLOPS | 9.896 TFLOPS |

| FP16 | 40.55 TFLOPS (2:1) | 19.79 TFLOPS (2:1) |

| Power connectors | 2x 8-pin | None |

| Slot width | Dual-slot | IGP |

| Bus interface | PCIe 4.0 x16 | PCIe 4.0 x8 |

Where Each One Wins

AMD Radeon PRO V620

The PRO V620 wins in raw compute benchmarks. The 67.2% OpenCL lead is unrivaled and the larger silicon is the reason. For productivity workloads, rendering, or any GPGPU compute task that uses the full Navi 21 die, this is the part that should be picked. The workstation board is also a better fit for a desktop system that can feed a 300 W part and provide two 8-pin connectors.

AMD Radeon RX 665M XT

The RX 6650M XT is the better part for a mobile platform. The 120 W TDP and IGP form factor are meant for laptops and small form factor systems. The benchmark results are lower, but the part runs efficiently in its intended environment. The 91st percentile versus all GPUs is a strong showing for a mobile part. It is the right choice when the system must be compact and the GPU must run within a laptop power budget.

The database's head-to-head record is one win and zero losses. The single recorded head-to-head run, Geekbench OpenCL, shows the PRO V620 at 128,580 vs the RX 6650M XT at 76,904, with a 67.2% delta. This is the largest recorded margin between these two parts, and it aligns with their respective roles as a workstation chip and a mobile chip.