AMD Radeon RX 6650M XT vs AMD Radeon RX 7900M Comparison

The AMD Radeon RX 7900M and AMD Radeon RX 6650M XT represent two distinct generations of AMD mobile graphics, and the benchmark data shows a decisive performance gap between them. The RX 7900M sits in the 94th percentile of all GPUs, while the RX 6650M XT holds the 91st percentile, but that narrow percentile difference belies a significant raw performance chasm. In the only shared benchmark test, the Geekbench OpenCL workload, the RX 7900M scores 129,499 against the RX 6650M XT’s 76,904, a 68.4% advantage for the newer card. This single head-to-head result establishes the RX 7900M as the overwhelmingly faster part, though the RX 6650M XT remains a capable contender in its own right for less demanding tasks.

Head-to-Head Benchmarks

The direct comparison between these two mobile GPUs is limited to a single common test, but that test is decisive. In Geekbench OpenCL, the AMD Radeon RX 7900M delivers a score of 129,499, while the AMD Radeon RX 6650M XT manages 76,904. The delta is 68.4% in favor of the RX 7900M, a massive margin that dwarfs the difference in their overall percentile rankings. This suggests that while both cards are above-average performers, the RX 7900M operates in a completely different performance tier.

Looking at average benchmark scores reinforces this gap. The RX 7900M has an average benchmark score of 97,487 across its tested workloads, which includes the Geekbench Vulkan score of 158,760 and the 3DMark Steel Nomad DX12 score of 4,201 in addition to the OpenCL result. The RX 6650M XT, with only the single OpenCL benchmark in its data set, has an average score of 76,904. The 26.7% difference in average scores is substantial, but the OpenCL head-to-head delta of 68.4% is the more telling figure because it is a direct apples-to-apples comparison.

The RX 7900M’s wins are not marginal. In the Geekbench OpenCL test, it outperforms the RX 6650M XT by more than two-thirds. For context, the RX 7900M’s nearest rival, the AMD Radeon Pro VII, is only 0.4% ahead in average score, while the NVIDIA Quadro RTX 6000 trails by 4.3% and the AMD Radeon Instinct MI60 is 5.4% behind. The RX 6650M XT, by contrast, sits in a much tighter cluster: the NVIDIA GeForce RTX 5090 D is just 1% ahead, the AMD Radeon RX 6850M XT is 2.6% ahead, and the NVIDIA Tesla P100 variants are roughly 3% ahead. This indicates that the RX 6650M XT is competitive with its immediate peers, but the RX 7900M is in a different league entirely when compared directly.

Architecture Differences

The architectural gap between these two GPUs is generational. The RX 7900M is built on the RDNA 3.0 architecture using the Navi 31 chip, manufactured on a 5 nm process at TSMC. The RX 6650M XT uses the older RDNA 2.0 architecture with the Navi 23 chip, fabricated on a 7 nm process, also at TSMC. This process shrink from 7 nm to 5 nm is a fundamental driver of the performance difference, allowing the RX 7900M to pack significantly more transistors into a smaller area.

The transistor counts tell the story clearly. The RX 7900M contains 57,700 million transistors on a 529 mm² die, yielding a transistor density of 109.1M per mm². The RX 6650M XT has just 11,060 million transistors on a 237 mm² die, for a density of 46.7M per mm². That is roughly a 5.2x difference in raw transistor count and a 2.3x difference in density, explaining why the RX 7900M can deliver over 3.8x the FP32 compute throughput (38.52 TFLOPS versus 9.896 TFLOPS).

Memory configurations diverge sharply as well. The RX 7900M features 16 GB of GDDR6 memory on a 256-bit bus, delivering 576.0 GB/s of bandwidth. The RX 6650M XT has half the memory at 8 GB, on a 128-bit bus, providing 256.0 GB/s. The RX 7900M also runs its memory at 2250 MHz (18 Gbps effective), compared to 2000 MHz (16 Gbps effective) on the RX 6650M XT. The RX 7900M’s memory bandwidth advantage of 320 GB/s is critical for high-resolution textures and compute workloads.

The compute unit layout scales accordingly. The RX 7900M has 4,608 shading units, 288 texture mapping units, and 192 render output units, with 72 ray tracing cores. The RX 6650M XT has 2,048 shading units, 128 TMUs, and 64 ROPs, with 32 ray tracing cores. Pixel and texture rates reflect this: the RX 7900M achieves 401.3 GPixel/s and 601.9 GTexel/s, while the RX 6650M XT manages 154.6 GPixel/s and 309.2 GTexel/s. Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, so API compatibility is identical.

Where Each One Wins

The RX 7900M wins in every measurable category where both cards have data. In the Geekbench OpenCL test, it wins by 68.4%. Its Vulkan score of 158,760 and 3DMark Steel Nomad DX12 score of 4,201 are additional data points that show strong performance in both compute and modern gaming workloads, though the RX 6650M XT has no corresponding scores for those tests. The RX 7900M’s advantage in memory bandwidth (576.0 GB/s versus 256.0 GB/s) and FP32 throughput (38.52 TFLOPS versus 9.896 TFLOPS) makes it the clear choice for GPU-accelerated compute, 4K gaming, and ray tracing workloads.

The RX 6650M XT’s wins are more subtle and relate to efficiency and availability rather than raw performance. Its TDP is 120 W, significantly lower than the RX 7900M’s 180 W, making it a better fit for thinner laptops with less robust cooling. It also has a higher boost clock of 2416 MHz compared to the RX 7900M’s 2090 MHz, which confirms its architectural efficiency at lower power levels, but this does not translate into higher real-world performance given the massive core count difference. The RX 6650M XT is also an end-of-life product, while the RX 7900M is still active, meaning the latter has a longer expected support window. For users prioritizing battery life and thermals over absolute performance, the RX 6650M XT holds an advantage, but for any performance-sensitive task, the RX 7900M dominates.

FAQ

Q: How much faster is the AMD Radeon RX 7900M than the RX 6650M XT in OpenCL?

A: The RX 7900M scores 129,499 in Geekbench OpenCL, while the RX 6650M XT scores 76,904, giving the RX 7900M a 68.4% performance advantage.

Q: What is the memory capacity difference between the two GPUs?

A: The RX 7900M has 16 GB of GDDR6 memory, while the RX 6650M XT has 8 GB. The RX 7900M also has a 256-bit bus versus the RX 6650M XT’s 128-bit bus, resulting in 576.0 GB/s versus 256.0 GB/s of bandwidth.

Q: Do both GPUs support the same modern APIs?

A: Yes, both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, so there is no difference in API feature support.

Q: Which GPU has a higher boost clock?

A: The RX 6650M XT has a higher boost clock at 2416 MHz, compared to the RX 7900M’s 2090 MHz, despite the RX 7900M being far more powerful overall.

Q: What is the power consumption difference?

A: The RX 7900M has a TDP of 180 W, while the RX 6650M XT has a TDP of 120 W, making the RX 6650M XT more power-efficient for thin-and-light laptops.

Q: Are there any benchmark results where the RX 6650M XT beats the RX 7900M?

A: No. In the only shared benchmark test (Geekbench OpenCL), the RX 7900M wins decisively. The RX 6650M XT has no recorded wins in the head-to-head data.

The Verdict

The data is unambiguous: the AMD Radeon RX 7900M is the superior GPU by a wide margin. Its 68.4% lead in the shared OpenCL benchmark, combined with its higher average score (97,487 versus 76,904) and superior specifications across every major category, makes it the pick for anyone who needs maximum performance. The RX 7900M also benefits from being an active product, whereas the RX 6650M XT is end-of-life, which may affect driver support and longevity.

The RX 6650M XT should be chosen only when its lower 120 W TDP is a hard requirement. It offers a higher boost clock and a much lower power draw, making it suitable for laptops where thermal headroom is limited and battery life is a priority. Its 91st percentile ranking shows it is still a strong performer, and its 8 GB memory is adequate for 1080p gaming and lighter compute tasks. However, for anything beyond that, the RX 7900M’s 16 GB memory, 576.0 GB/s bandwidth, and 38.52 TFLOPS of FP32 compute make it the only rational choice. Users who value raw performance, future-proofing, and larger memory buffers should opt for the RX 7900M, while those who prioritize portability and efficiency over speed will find the RX 6650M XT acceptable, though clearly inferior.

Specification Differences

| Specification | AMD Radeon RX 7900M | AMD Radeon RX 6650M XT |

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

| Architecture | RDNA 3.0 | RDNA 2.0 |

| Chip | Navi 31 | Navi 23 |

| Process Node | 5 nm | 7 nm |

| Transistors | 57,700 million | 11,060 million |

| Die Size | 529 mm² | 237 mm² |

| Transistor Density | 109.1M / mm² | 46.7M / mm² |

| Base Clock | 1825 MHz | 2068 MHz |

| Boost Clock | 2090 MHz | 2416 MHz |

| Game Clock | None | 2162 MHz |

| Memory Clock | 2250 MHz (18 Gbps effective) | 2000 MHz (16 Gbps effective) |

| Memory Size | 16 GB | 8 GB |

| Memory Bus Width | 256 bit | 128 bit |

| Memory Bandwidth | 576.0 GB/s | 256.0 GB/s |

| Shading Units | 4608 | 2048 |

| TMUs | 288 | 128 |

| ROPs | 192 | 64 |

| Ray Tracing Cores | 72 | 32 |

| Pixel Rate | 401.3 GPixel/s | 154.6 GPixel/s |

| Texture Rate | 601.9 GTexel/s | 309.2 GTexel/s |

| FP32 Performance | 38.52 TFLOPS | 9.896 TFLOPS |

| FP16 Performance | 77.05 TFLOPS (2:1) | 19.79 TFLOPS (2:1) |

| TDP | 180 W | 120 W |

| Bus Interface | PCIe 4.0 x16 | PCIe 4.0 x8 |

| Production Status | Active | End-of-life |

| Release Date | 2023-10-18 | 2022-01-03 |

| Generation | Navi Mobile (RX 7000M) | Navi Mobile (RX 6000M) |