AMD Radeon PRO V620 vs AMD Radeon RX 6650M Comparison

The Verdict

The AMD Radeon PRO V620 is the clear performance leader in this pairing. The recorded data shows it wins both head-to-head benchmark tests decisively, with an average benchmark score of 136,472 compared to 71,768 for the AMD Radeon RX 6650M. That is roughly a 90% advantage in average score, placing the PRO V620 at the 96th percentile of all GPUs in the database, while the RX 6650M sits at the 91st percentile.

The PRO V620 is for compute-heavy professional workloads where raw throughput matters more than power efficiency or physical footprint. Its 32 GB memory capacity and 512.0 GB/s bandwidth make it suited for large datasets and rendering tasks that exceed the capacity of typical mobile GPUs. The RX 6650M, by contrast, is a mobile part with an IGP slot width, no power connectors, and a 120 W TDP. It is the choice for a portable system where the PRO V620's 300 W TDP, dual-slot footprint, and 2x 8-pin connectors would be impossible to accommodate.

If the workload fits within 8 GB of memory and the system is a laptop, the RX 6650M is the only practical option of the two. If the workload demands maximum compute throughput and memory capacity, and the chassis can handle a 267 mm dual-slot card with external power, the PRO V620 is the answer. There is no scenario in the data where the RX 6650M beats the PRO V620 in raw performance, but there are many scenarios where the PRO V620 simply cannot be installed.

Architecture Differences

Both GPUs are built on TSMC's 7 nm process and both use the RDNA 2.0 architecture, but they are very different implementations. The PRO V620 uses the Navi 21 chip with 26,800 million transistors on a 520 mm² die, giving a transistor density of 51.5 million per mm². The RX 6650M uses the smaller Navi 23 chip with 11,060 million transistors on a 237 mm² die, at a density of 46.7 million per mm².

The compute resources differ substantially. The PRO V620 has 4,608 shading units, 288 texture mapping units, 128 ROPs, and 72 ray tracing cores. The RX 6650M has 1,792 shading units, 112 TMUs, 64 ROPs, and 28 ray tracing cores. That is more than double the shading units and TMUs on the PRO V620, and more than double the ray tracing cores.

Memory architecture is also divergent. The PRO V620 uses a 256 bit memory bus with 32 GB of GDDR6 at 2000 MHz (16 Gbps effective), yielding 512.0 GB/s of bandwidth. The RX 6650M uses a 128 bit bus with 8 GB of GDDR6 at 1750 MHz (14 Gbps effective), yielding 224.0 GB/s. The PRO V620 has four times the memory capacity and more than double the bandwidth.

The API support is identical: both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Neither has tensor cores. The PRO V620 is from the Radeon Pro Navi (Navi II Series) generation, while the RX 6650M belongs to the Radeon RX 6000 series, Navi Mobile (RX 6000M) generation. The PRO V620 was released on 2021-11-03, and the RX 6650M followed on 2022-01-03. Both are now end-of-life products.

Head-to-Head Benchmarks

The database contains two head-to-head benchmark results, and the PRO V620 wins both by wide margins.

In Geekbench OpenCL, the PRO V620 scores 128,580 against 65,800 for the RX 6650M. That is a 95.4% delta, meaning the PRO V620 delivers nearly double the OpenCL compute performance. In Geekbench Vulkan, the PRO V620 scores 144,364 against 77,735, a delta of 85.7%. The Vulkan gap is slightly smaller in percentage terms but still enormous.

The average benchmark score tells the same story. The PRO V620 averages 136,472 across the recorded tests, while the RX 6650M averages 71,768. The PRO V620's nearest rivals in the database are the AMD Radeon Pro W6800X Duo at 135,774 (0.5% behind), the AMD Radeon PRO W6800 at 135,396 (0.8% behind), the NVIDIA A10M at 135,230 (0.9% behind), and the NVIDIA RTX 4000 Ada Generation at 135,218 (0.9% behind). All of these are within a single percentage point of the PRO V620, putting it in a tight cluster of high-end workstation and datacenter cards.

The RX 6650M's nearest rivals are much lower in absolute terms. The NVIDIA TITAN X Pascal averages 72,098 (0.5% ahead), the AMD Radeon Pro Vega 64 averages 72,379 (0.8% ahead), the AMD Radeon RX 6600 LE averages 70,829 (1.3% behind), and the AMD Radeon Vega Frontier Edition averages 73,370 (2.2% ahead). The RX 6650M is competitive with these older desktop cards, but it is in a completely different performance class from the PRO V620.

Specification Differences

The two cards differ on nearly every specification that matters for performance and installation.

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

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

| Chip | Navi 21 | Navi 23 |

| Generation | Radeon Pro Navi (Navi II Series) | Navi Mobile (RX 6000M) |

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

| Die size | 520 mm² | 237 mm² |

| Transistor density | 51.5M / mm² | 46.7M / mm² |

| Base clock | 1825 MHz | 2068 MHz |

| Boost clock | 2200 MHz | 2416 MHz |

| Game clock | None | 2222 MHz |

| Memory clock | 2000 MHz (16 Gbps effective) | 1750 MHz (14 Gbps effective) |

| Memory size | 32 GB | 8 GB |

| Memory bus | 256 bit | 128 bit |

| Memory bandwidth | 512.0 GB/s | 224.0 GB/s |

| Shading units | 4608 | 1792 |

| TMUs | 288 | 112 |

| ROPs | 128 | 64 |

| Ray tracing cores | 72 | 28 |

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

| Texture rate | 633.6 GTexel/s | 270.6 GTexel/s |

| FP32 | 20.28 TFLOPS | 8.659 TFLOPS |

| FP16 | 40.55 TFLOPS (2:1) | 17.32 TFLOPS (2:1) |

| TDP | 300 W | 120 W |

| Slot width | Dual-slot | IGP |

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

| Suggested PSU | 700 W | None |

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

| Display outputs | No outputs | Portable Device Dependent |

| Dimensions | 267 mm x 120 mm x 50 mm | Not recorded |

| Release date | 2021-11-03 | 2022-01-03 |

| Predecessor | Radeon Pro Vega | Polaris Mobile |

The RX 6650M actually has higher clocks: a 2068 MHz base and 2416 MHz boost versus 1825 MHz and 2200 MHz for the PRO V620, plus a 2222 MHz game clock that the PRO V620 does not list. But the PRO V620's massive advantage in compute units, memory bus width, and memory capacity overwhelms the clock speed difference.

The PRO V620 draws 300 W and requires a 700 W suggested PSU, while the RX 6650M draws 120 W and requires no external power connectors. The PRO V620 is a dual-slot card measuring 267 mm in length, 120 mm in height, and 50 mm in width, with no display outputs. The RX 6650M is an IGP-class mobile part with display outputs described as portable device dependent. The PRO V620 uses a PCIe 4.0 x16 interface, while the RX 6650M uses PCIe 4.0 x8.

FAQ

Q: Which GPU is faster in compute benchmarks?

A: The AMD Radeon PRO V620 wins both recorded head-to-head tests. It scores 128,580 in Geekbench OpenCL versus 65,800 for the RX 6650M (95.4% higher), and 144,364 in Geekbench Vulkan versus 77,735 (85.7% higher).

Q: Can the PRO V620 be used in a laptop?

A: No. The PRO V620 is a dual-slot card measuring 267 mm by 120 mm by 50 mm with 2x 8-pin power connectors and a 300 W TDP. The RX 6650M is an IGP with no power connectors and a 120 W TDP, designed for portable systems.

Q: How much memory does each card have?

A: The PRO V620 has 32 GB of GDDR6 on a 256 bit bus with 512.0 GB/s bandwidth. The RX 6650M has 8 GB of GDDR6 on a 128 bit bus with 224.0 GB/s bandwidth.

Q: Which card has higher clock speeds?

A: The RX 6650M has a 2068 MHz base and 2416 MHz boost, plus a 2222 MHz game clock. The PRO V620 has a lower 1825 MHz base and 2200 MHz boost, but its much larger compute configuration makes it far faster overall.

Q: Are they in the same performance class as their nearest rivals?

A: No. The PRO V620 sits among workstation cards like the AMD Radeon Pro W6800X Duo (0.5% behind), AMD Radeon PRO W6800 (0.8% behind), NVIDIA A10M (0.9% behind), and NVIDIA RTX 4000 Ada Generation (0.9% behind). The RX 6650M competes with older desktop cards like the NVIDIA TITAN X Pascal (0.5% ahead) and AMD Radeon Pro Vega 64 (0.8% ahead).

Q: Do both support the same graphics APIs?

A: Yes. Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Neither has tensor cores.

Where Each One Wins

The AMD Radeon PRO V620 wins in every measured performance category. Its compute throughput is dramatically higher: 20.28 TFLOPS FP32 versus 8.659 TFLOPS, and 40.55 TFLOPS FP16 versus 17.32 TFLOPS. Its pixel rate is 281.6 GPixel/s versus 154.6 GPixel/s, and its texture rate is 633.6 GTexel/s versus 270.6 GTexel/s. It has 72 ray tracing cores versus 28, and 32 GB of memory versus 8 GB. For any workload that is bound by raw compute, memory capacity, or memory bandwidth, the PRO V620 is the clear pick.

The RX 6650M wins in the practical categories of installation and power. It is an IGP with a 120 W TDP and no power connectors, so it can be integrated into a laptop or compact mobile platform. The PRO V620 requires a 300 W power budget, a 700 W suggested PSU, a dual-slot chassis, and two 8-pin connectors. It also has no display outputs, meaning it cannot drive a monitor directly; the RX 6650M's outputs are portable device dependent, which at least allows for display connectivity in a laptop context.

The RX 6650M also has higher clock speeds, with a 2068 MHz base and 2416 MHz boost, but this does not translate into a performance win in the recorded benchmarks. The PRO V620's advantage in shading units (4,608 versus 1,792), TMUs (288 versus 112), and ROPs (128 versus 64) is simply too large to overcome.

In summary, the PRO V620 is the performance winner without qualification, and the RX 6650M is the winner only in portability, power draw, and installation flexibility. A builder with a desktop workstation chassis and a power budget to match should take the PRO V620. A builder working within a laptop's thermal and power envelope has only one viable option of the two, the RX 6650M.