AMD Radeon RX 6600M vs AMD Radeon RX 6700 XT Comparison

Head-to-Head Benchmarks

The benchmark database shows a clear overall winner in this comparison. The AMD Radeon RX 6700 XT takes 10 of 11 head-to-head tests, leaving the AMD Radeon RX 6600M with a single victory. The average benchmark score reinforces this gap: the RX 6700 XT averages 27,425 points, while the RX 6600M settles at 23,273 points, a difference of roughly 18%.

The largest margin comes in PassMark GPU Compute, where the RX 6700 XT scores 9,336 versus 5,646 for the RX 6600M. That is a 65.4% advantage, the widest spread in the entire comparison. The 3DMark Steel Nomad DX12 test shows a similar story: 2,435 points for the RX 6700 XT against 1,495 for the RX 6600M, a 62.9% lead. These two results indicate the desktop card's raw compute and modern API performance outpace the mobile part by a substantial margin.

The RX 6700 XT also dominates in DirectX legacy tests. In PassMark DirectX 10, it scores 124 versus 87, a 42.5% lead. DirectX 12 shows 77 versus 52, a 48.1% advantage. DirectX 11 comes in at 173 versus 136, a 27.2% gap, and DirectX 9 shows 242 versus 184, a 31.5% lead. Across the board, the desktop card maintains a consistent edge in rasterization workloads.

Geekbench results are more mixed. The RX 6700 XT wins Geekbench Metal with 130,896 points against 92,237, a 41.9% margin. It also takes Geekbench Vulkan with 93,500 versus 73,740, a 26.8% lead. However, in Geekbench OpenCL, the RX 6600M flips the script entirely. It scores 67,765 against 44,152 for the RX 6700 XT, a 34.8% advantage for the mobile GPU. This is the sole benchmark where the RX 6600M comes out ahead, and it is a notable one for compute-oriented OpenCL workloads.

PassMark G3D shows the RX 6700 XT at 19,786 versus 13,929, a 42% difference. PassMark G2D, which measures 2D graphics performance, gives the RX 6700 XT 951 points against 728, a 30.6% lead. The pattern is consistent: the RX 6700 XT wins by margins ranging from roughly 27% to 65% in most tests, with the single OpenCL exception going the other way.

Architecture Differences

Both GPUs share the same RDNA 2.0 architecture and are built on TSMC's 7 nm process. They belong to the Radeon RX 6000 series, but the similarities end there. The RX 6700 XT uses the Navi 22 chip, while the RX 6600M relies on Navi 23. The desktop part packs 17,200 million transistors on a 335 mm² die, giving a transistor density of 51.3 million per square millimeter. The mobile chip has 11,060 million transistors on a 237 mm² die, with a density of 46.7 million per square millimeter.

The compute configuration diverges significantly. The RX 6700 XT has 2,560 shading units, 160 texture mapping units, and 64 ROPs. The RX 6600M scales down to 1,792 shading units, 112 TMUs, and the same 64 ROPs. Ray tracing hardware follows the same pattern: 40 RT cores on the desktop card versus 28 on the mobile part. Neither GPU includes dedicated tensor cores.

Clock speeds tell a story of power allocation. The RX 6700 XT operates at a 2,321 MHz base clock, a 2,424 MHz game clock, and a 2,581 MHz boost clock. The RX 6600M runs lower across the board: 2,068 MHz base, 2,177 MHz game, and 2,416 MHz boost. The desktop card's higher clocks, combined with more shading units, produce a large throughput gap. The RX 6700 XT delivers 13.21 TFLOPS of FP32 performance against 8.659 TFLOPS for the RX 6600M. FP16 numbers follow: 26.43 TFLOPS versus 17.32 TFLOPS, both at a 2:1 ratio.

Memory subsystems differ in capacity and bandwidth. The RX 6700 XT has 12 GB of GDDR6 memory on a 192-bit bus, running at 2,000 MHz with 16 Gbps effective speed, yielding 384.0 GB/s of bandwidth. The RX 6600M offers 8 GB of GDDR6 on a 128-bit bus, at 1,750 MHz with 14 Gbps effective speed, producing 224.0 GB/s. The desktop card's wider bus and faster memory give it roughly 71% more bandwidth.

Power and physical design are fundamentally different. The RX 6700 XT carries a 230 W TDP, uses dual-slot cooling, and requires a 1x 6-pin plus 1x 8-pin power connector, with a suggested 550 W power supply. The RX 6600M is an integrated GPU with a 100 W TDP, no power connectors, and no suggested PSU rating. The desktop card measures 267 mm in length, 110 mm in height, and 40 mm in width, while the mobile part has no listed dimensions. The RX 6700 XT connects via PCIe 4.0 x16, whereas the RX 6600M uses PCIe 4.0 x8.

Where Each One Wins

The RX 6700 XT is the clear choice for gamers and content creators who need maximum performance in a desktop build. Its wins in DirectX 10, 11, 12, and 9 benchmarks, along with 3DMark Steel Nomad, cover the full range of modern and legacy gaming APIs. The 42% lead in PassMark G3D and the 65.4% advantage in GPU compute suggest it handles both gaming and compute-heavy tasks with ease. The 12 GB memory capacity and 384.0 GB/s bandwidth give it headroom for high-resolution textures and demanding workloads.

The RX 6600M, despite losing most tests, has its niche. Its single victory in Geekbench OpenCL with a 34.8% margin indicates it excels in OpenCL compute scenarios. The lower 100 W TDP makes it suitable for thin-and-light laptops where power efficiency matters more than raw performance. The 8 GB memory capacity is still workable for mainstream gaming at moderate settings, and the 224.0 GB/s bandwidth, while lower, is sufficient for many titles.

The data suggests a clear split: the RX 6700 XT for desktop users who want maximum performance across a broad range of workloads, and the RX 6600M for mobile users who prioritize portability and efficiency but still need RDNA 2 features like DirectX 12 Ultimate and hardware ray tracing. The RX 6700 XT's 72nd percentile ranking among all GPUs, compared to the RX 6600M's 68th, confirms that the desktop part sits higher in the overall performance distribution.

FAQ

Q: Which GPU has a higher average benchmark score?

A: The AMD Radeon RX 6700 XT averages 27,425 points, while the AMD Radeon RX 6600M averages 23,273 points.

Q: What is the largest performance gap between the two?

A: The biggest margin is in PassMark GPU Compute, where the RX 6700 XT leads by 65.4% with 9,336 points versus 5,646 for the RX 6600M.

Q: Does the RX 6600M win any benchmark?

A: Yes, it wins Geekbench OpenCL with 67,765 points against 44,152 for the RX 6700 XT, a 34.8% advantage.

Q: How do their memory configurations compare?

A: The RX 6700 XT has 12 GB of GDDR6 on a 192-bit bus with 384.0 GB/s bandwidth. The RX 6600M has 8 GB of GDDR6 on a 128-bit bus with 224.0 GB/s bandwidth.

Q: Are both GPUs based on the same architecture?

A: Yes, both use RDNA 2.0 and are built on TSMC's 7 nm process, but they use different chips: Navi 22 for the RX 6700 XT and Navi 23 for the RX 6600M.

Q: What is the TDP difference?

A: The RX 6700 XT has a 230 W TDP, while the RX 6600M has a 100 W TDP.

Specification Differences

| Field | AMD Radeon RX 6700 XT | AMD Radeon RX 6600M |

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

| Chip | Navi 22 | Navi 23 |

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

| Transistors | 17,200 million | 11,060 million |

| Die Size | 335 mm² | 237 mm² |

| Transistor Density | 51.3M / mm² | 46.7M / mm² |

| Base Clock | 2321 MHz | 2068 MHz |

| Boost Clock | 2581 MHz | 2416 MHz |

| Game Clock | 2424 MHz | 2177 MHz |

| Memory Clock | 2000 MHz, 16 Gbps effective | 1750 MHz, 14 Gbps effective |

| Memory Size | 12 GB | 8 GB |

| Memory Bus Width | 192 bit | 128 bit |

| Memory Bandwidth | 384.0 GB/s | 224.0 GB/s |

| Shading Units | 2560 | 1792 |

| TMUs | 160 | 112 |

| RT Cores | 40 | 28 |

| Pixel Rate | 165.2 GPixel/s | 154.6 GPixel/s |

| Texture Rate | 413.0 GTexel/s | 270.6 GTexel/s |

| FP32 Performance | 13.21 TFLOPS | 8.659 TFLOPS |

| FP16 Performance | 26.43 TFLOPS (2:1) | 17.32 TFLOPS (2:1) |

| TDP | 230 W | 100 W |

| Slot Width | Dual-slot | IGP |

| Power Connectors | 1x 6-pin + 1x 8-pin | None |

| Suggested PSU | 550 W | None |

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

| Display Outputs | 1x HDMI 2.1, 3x DisplayPort 1.4a | Portable Device Dependent |

| Dimensions | 267 mm x 110 mm x 40 mm | Not listed |

| Release Date | 2021-03-02 | 2021-05-30 |

| Predecessor | Navi | Polaris Mobile |

| Successor | Navi III | None |

| Launch MSRP | 479 USD | None |