AMD Radeon RX 6600M vs AMD Radeon RX 7700 XT Comparison

FAQ

Q: Which GPU has the higher average benchmark score?

A: The AMD Radeon RX 6600M has a higher average benchmark score of 23273, while the AMD Radeon RX 7700 XT scores 22549. The 6600M sits in the 68th percentile of all GPUs, while the 7700 XT sits in the 67th percentile.

Q: How do the two compare in the 3DMark Steel Nomad DX12 test?

A: The RX 7700 XT scores 3316, which is 54.9% higher than the RX 6600M’s 1495. This is the largest single-test gap between the two in the head-to-head data.

Q: Which GPU wins in the Vulkan benchmark?

A: The RX 6600M wins the Geekbench Vulkan test with a score of 73740, compared to the RX 7700 XT’s 46443. That is a 58.8% advantage for the 6600M, its only head-to-head win out of ten tests.

Q: What is the memory configuration difference?

A: The RX 6600M has 8 GB of GDDR6 memory on a 128-bit bus with 224.0 GB/s bandwidth. The RX 7700 XT has 12 GB of GDDR6 memory on a 192-bit bus with 432.0 GB/s bandwidth.

Q: Are these GPUs from the same architecture generation?

A: No. The RX 6600M uses RDNA 2.0 on a 7 nm process, while the RX 7700 XT uses RDNA 3.0 on a 5 nm process. The 6600M is from the Navi Mobile (RX 6000M) generation, and the 7700 XT is from the Navi III (RX 7000) generation.

Q: What is the power draw difference?

A: The RX 6600M has a TDP of 100 W and is an IGP (integrated) slot width with no power connectors. The RX 7700 XT has a TDP of 245 W, is dual-slot, and requires two 8-pin power connectors with a suggested 550 W PSU.

Architecture Differences

The two GPUs represent separate architectural generations from AMD. The RX 6600M is built on RDNA 2.0 using the Navi 23 chip, fabricated on a 7 nm process at TSMC with 11,060 million transistors on a 237 mm² die. The RX 7700 XT uses RDNA 3.0 with the Navi 32 chip (codename "Wheat Nas"), fabricated on a 5 nm process at TSMC with 28,100 million transistors on a 346 mm² die. The transistor density reflects this: 46.7M per mm² for the 6600M versus 81.2M per mm² for the 7700 XT.

The compute configuration scales significantly. The RX 6600M has 1792 shading units, 112 texture mapping units, and 64 ROPs. The RX 7700 XT nearly doubles those counts with 3456 shading units, 216 TMUs, and 96 ROPs. Ray tracing hardware also increases from 28 RT cores on the 6600M to 54 RT cores on the 7700 XT.

Clock behavior differs in a notable way. The RX 6600M has a higher base clock at 2068 MHz, but the RX 7700 XT boosts higher at 2544 MHz. The game clocks are nearly identical: 2177 MHz for the 6600M and 2171 MHz for the 7700 XT. Memory clocks also differ, with the 6600M running at 1750 MHz (14 Gbps effective) and the 7700 XT at 2250 MHz (18 Gbps effective).

The memory subsystem is a major architectural divergence. The 6600M uses 8 GB of GDDR6 on a 128-bit bus, yielding 224.0 GB/s bandwidth. The 7700 XT uses 12 GB of GDDR6 on a 192-bit bus, yielding 432.0 GB/s — nearly double the bandwidth. The bus interface also differs: the 6600M uses PCIe 4.0 x8, while the 7700 XT uses PCIe 4.0 x16.

FP32 compute output shows a substantial gap. The RX 6600M delivers 8.659 TFLOPS, while the RX 7700 XT delivers 35.17 TFLOPS — a fourfold difference. FP16 rates also differ in ratio: the 6600M achieves 17.32 TFLOPS at a 2:1 rate, while the 7700 XT achieves 35.17 TFLOPS at a 1:1 rate. Pixel and texture rates follow the same trend: 154.6 GPixel/s and 270.6 GTexel/s for the 6600M versus 244.2 GPixel/s and 549.5 GTexel/s for the 7700 XT.

Both share identical API support for DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The production status differs: the 6600M is end-of-life, while the 7700 XT is active. The 7700 XT carries a launch MSRP of 449 USD.

The Verdict

The data points to a clear performance hierarchy, but with an important caveat. The RX 7700 XT wins 9 of 10 head-to-head benchmarks, including decisive victories in compute-heavy and modern API tests. Its 3DMark Steel Nomad score of 3316 versus 1495 represents a 54.9% lead, and its Geekbench OpenCL score of 138383 versus 67765 is a 51% lead. The 7700 XT also wins all Passmark tests, with leads ranging from 26.9% in DirectX 10 to 56.3% in GPU Compute.

However, the RX 6600M posts a higher average benchmark score overall (23273 versus 22549) and a higher percentile ranking (68th versus 67th). This is driven by its dominant Vulkan performance: 73740 versus 46443, a 58.8% advantage. The 6600M also lacks a launch MSRP, while the 7700 XT has a stated launch MSRP of 449 USD.

For users prioritizing raw throughput, modern DirectX 12 workloads, and compute performance, the RX 7700 XT is the clear choice based on the benchmark data. Its wins span every Passmark API test, plus OpenCL and Steel Nomad. For users targeting Vulkan-based workloads or applications where the 6600M’s higher average score matters, the mobile GPU holds a niche advantage. The 6600M is an end-of-life IGP with no power connectors, suited to portable devices; the 7700 XT is an active dual-slot card requiring a 550 W PSU and two 8-pin connectors. The choice between them should follow the workload, not just the aggregate score.

Specification Differences

| Field | AMD Radeon RX 6600M | AMD Radeon RX 7700 XT |

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

| Architecture | RDNA 2.0 | RDNA 3.0 |

| Chip | Navi 23 | Navi 32 |

| Process Node | 7 nm | 5 nm |

| Transistors | 11,060 million | 28,100 million |

| Die Size | 237 mm² | 346 mm² |

| Transistor Density | 46.7M / mm² | 81.2M / mm² |

| Base Clock | 2068 MHz | 1435 MHz |

| Boost Clock | 2416 MHz | 2544 MHz |

| Game Clock | 2177 MHz | 2171 MHz |

| Memory Clock | 1750 MHz (14 Gbps) | 2250 MHz (18 Gbps) |

| Memory Size | 8 GB | 12 GB |

| Memory Bus | 128 bit | 192 bit |

| Memory Bandwidth | 224.0 GB/s | 432.0 GB/s |

| Shading Units | 1792 | 3456 |

| TMUs | 112 | 216 |

| ROPs | 64 | 96 |

| RT Cores | 28 | 54 |

| Pixel Rate | 154.6 GPixel/s | 244.2 GPixel/s |

| Texture Rate | 270.6 GTexel/s | 549.5 GTexel/s |

| FP32 | 8.659 TFLOPS | 35.17 TFLOPS |

| FP16 | 17.32 TFLOPS (2:1) | 35.17 TFLOPS (1:1) |

| TDP | 100 W | 245 W |

| Slot Width | IGP | Dual-slot |

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

| Suggested PSU | — | 550 W |

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

| Display Outputs | Portable Device Dependent | 1x HDMI 2.1a, 2x DisplayPort 2.1, 1x USB Type-C |

| Dimensions | — | 267 mm x 135 mm x 50 mm |

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

| Release Date | 2021-05-30 | 2023-09-05 |

| Predecessor | Polaris Mobile | Navi II |

| Successor | — | Navi IV |

| Launch MSRP | — | 449 USD |

Head-to-Head Benchmarks

The RX 7700 XT dominates the head-to-head results, winning 9 of 10 tests. The largest margin comes in 3DMark Steel Nomad DX12, where the 7700 XT scores 3316 against the 6600M’s 1495 — a 54.9% lead. The Geekbench OpenCL test shows a similar gap: 138383 versus 67765, a 51% advantage for the 7700 XT. These two tests alone establish the 7700 XT as the stronger performer for modern DX12 and general-purpose compute.

Passmark results follow a consistent pattern. In DirectX 11, the 7700 XT scores 232 versus 136, a 41.4% lead. In DirectX 9, the gap is 294 versus 184, a 37.4% difference. DirectX 12 shows 79 versus 52, a 34.2% advantage. DirectX 10 shows 119 versus 87, a 26.9% lead. The 2D test (Passmark G2D) gives the 7700 XT a 1161 versus 728 result, a 37.3% margin. The 3D test (Passmark G3D) shows 22547 versus 13929, a 38.2% advantage. The GPU Compute test is the second-largest gap: 12912 versus 5646, a 56.3% lead for the 7700 XT.

The single win for the RX 6600M is the Geekbench Vulkan test. The 6600M scores 73740, while the 7700 XT scores 46443. That 58.8% margin is actually the largest percentage difference in either direction across all ten tests. This suggests the 6600M has a Vulkan optimization advantage that does not translate to other APIs.

The aggregate benchmark scores tell a slightly different story. The RX 6600M’s average benchmark score is 23273, marginally higher than the 7700 XT’s 22549. The nearest rivals for the 6600M include the AMD Radeon R9 M290X (deltaPct 0), the AMD Radeon Pro Vega 16 (deltaPct 0.1), and the NVIDIA P106-100 (deltaPct 0.1). For the 7700 XT, the nearest rivals are the NVIDIA GeForce RTX 5060 Mobile (deltaPct 0.5), the NVIDIA GeForce RTX 4060 Mobile (deltaPct -0.8), and the NVIDIA GeForce RTX 2080 (deltaPct -1.5). The 6600M’s slightly higher average is driven by its Vulkan outlier, while the 7700 XT’s wins are more evenly distributed across multiple tests.

Where Each One Wins

The RX 7700 XT is the winner for DirectX-centric workloads. It takes every Passmark DirectX test (DX9 through DX12) with margins between 26.9% and 41.4%. It also wins the 3DMark Steel Nomad DX12 test by 54.9%, the most demanding modern API test in the dataset. For users running DX12 games or applications, the 7700 XT’s 12 GB memory and 432.0 GB/s bandwidth provide a substantial buffer over the 6600M’s 8 GB and 224.0 GB/s. The compute performance also favors the 7700 XT decisively: 35.17 TFLOPS FP32 versus 8.659 TFLOPS, reflected in the 56.3% GPU Compute win and the 51% OpenCL win.

The RX 6600M wins in Vulkan-specific scenarios. Its Geekbench Vulkan score of 73740 beats the 7700 XT by 58.8%, the largest single-test margin in the entire head-to-head set. This makes the 6600M the better choice for Vulkan-based rendering workloads, even though it loses every other test. The 6600M also holds a slight edge in average benchmark score (23273 versus 22549) and percentile ranking (68th versus 67th), meaning that across a broad mix of tests, it does not fall as far behind as the head-to-head wins might suggest.

For portable systems, the 6600M’s IGP form factor, 100 W TDP, and lack of external power connectors make it suitable for integrated mobile designs. The 7700 XT requires a dual-slot chassis, two 8-pin connectors, and a 550 W PSU, with physical dimensions of 267 mm by 135 mm by 50 mm. The 7700 XT also offers more display outputs (HDMI 2.1a, two DisplayPort 2.1, and USB Type-C) versus the 6600M’s portable-device-dependent outputs. The 7700 XT is active and current, while the 6600M is end-of-life. Based on the data, the 7700 XT is the stronger all-around GPU, with the 6600M retaining a specific Vulkan advantage and a marginally higher aggregate score.