AMD Radeon RX 6600M vs NVIDIA GeForce RTX 4070 Mobile Comparison

Where Each One Wins

The recorded benchmark data shows a complete sweep for the NVIDIA GeForce RTX 4070 Mobile, which wins all nine head-to-head comparisons against the AMD Radeon RX 6600M. There is no test category in which the AMD part takes the lead, making the use-case split largely a matter of degree rather than direction.

The largest gaps appear in compute-oriented workloads. In Geekbench OpenCL, the RTX 4070 Mobile scores 109,197 against 67,765 for the RX 6600M, a 61.1% advantage. The Vulkan result is similarly lopsided: 108,367 versus 73,740, a 47% lead. These two tests indicate that the NVIDIA GPU sustains its advantage across different API families, not just within a single vendor's preferred framework.

DirectX 12 results show the most pronounced delta of any benchmark in the set. The RTX 4070 Mobile posts 85 points versus 52 points for the RX 6600M, a 63.5% difference. This is notable because DirectX 12 is the modern low-level API that most current games use, and the data suggests the NVIDIA part handles that workload with substantially more headroom.

The PassMark G3D suite, which aggregates general 3D rendering performance, gives the RTX 4070 Mobile 19,587 points against 13,929 for the RX 6600M, a 40.6% lead. This is the most representative single number for overall gaming performance in the database, and it places the NVIDIA part clearly ahead.

Compute results follow the same pattern. PassMark GPU Compute gives the RTX 4070 Mobile 8,399 points versus 5,646 for the RX 6600M, a 48.8% margin. Legacy DirectX tests are closer but still favor NVIDIA: DirectX 9 shows 223 versus 184 (21.2% lead), DirectX 10 shows 116 versus 87 (33.3% lead), and DirectX 11 shows 179 versus 136 (31.6% lead).

The narrowest win is in PassMark G2D, a 2D graphics test, where the RTX 4070 Mobile scores 763 against 728, a modest 4.8% advantage. This suggests that for basic desktop and 2D workloads, the two GPUs are nearly equivalent, and the practical difference there would be difficult to perceive.

The average benchmark score tells the same story. The RTX 4070 Mobile averages 27,435 points across its recorded tests, while the RX 6600M averages 23,273. The NVIDIA part sits at the 73rd percentile among all GPUs in the database, while the AMD part sits at the 68th percentile. Both are above average, but the gap between them is consistent across every measurement.

The Verdict

The data points to a clear choice for most users: the NVIDIA GeForce RTX 4070 Mobile outperforms the AMD Radeon RX 6600M in every recorded benchmark, with margins ranging from 4.8% in 2D to 63.5% in DirectX 12. The average score difference is approximately 18%, which is substantial for two mobile GPUs that share the same 8 GB GDDR6 memory configuration and 128-bit memory bus width.

Users who prioritize modern gaming should favor the RTX 4070 Mobile based on its DirectX 12 and Vulkan results. The 63.5% lead in DirectX 12 is the single largest delta in the dataset, and the 47% lead in Vulkan reinforces that this advantage carries into multiple contemporary rendering APIs.

Users who work with compute-heavy applications, such as GPU-accelerated rendering or machine learning inference, should also prefer the NVIDIA part. The 61.1% lead in Geekbench OpenCL and 48.8% lead in PassMark GPU Compute indicate a strong general-purpose compute advantage, not merely a gaming-centric one.

The RX 6600M is not without merit in absolute terms. Its average score of 23,273 places it at the 68th percentile, and its nearest rivals in the database include the AMD Radeon R9 M290X and AMD Radeon Pro Vega 16 with nearly identical average scores. It is a capable mobile GPU, but in direct comparison it consistently trails the RTX 4070 Mobile.

Given the production status, the choice is also forward-looking. The RTX 4070 Mobile is listed as Active in production, while the RX 6600M is marked End-of-life. Users selecting hardware for a new system should factor this into their decision, as active production typically implies ongoing driver support and availability.

Head-to-Head Benchmarks

The Geekbench OpenCL test delivers the second-largest margin in the dataset. The RTX 4070 Mobile scores 109,197, while the RX 6600M scores 67,765, producing a 61.1% delta. This is a strong indicator of raw compute throughput, and the NVIDIA GPU's higher FP32 rating of 15.62 TFLOPS versus 8.659 TFLOPS for the AMD part aligns with this result.

Geekbench Vulkan shows a similar pattern, with the RTX 4070 Mobile at 108,367 and the RX 6600M at 73,740, a 47% delta. The Vulkan API is widely used in modern cross-platform games and emulators, so this result has practical gaming implications beyond pure compute.

The PassMark DirectX 12 test produces the largest gap of all: 85 points for the RTX 4070 Mobile versus 52 points for the RX 6600M, a 63.5% delta. This is the most important result for contemporary gaming, as DirectX 12 is the primary API for current AAA titles on Windows. The magnitude of this lead suggests the NVIDIA architecture extracts more efficiency from low-level API features.

PassMark G3D gives the RTX 4070 Mobile 19,587 points against 13,929 for the RX 6600M, a 40.6% delta. This aggregate 3D score correlates with real-world gaming performance across a broad range of titles, making it one of the most useful single metrics in the dataset.

PassMark GPU Compute shows 8,399 versus 5,646, a 48.8% delta. This test measures general-purpose compute tasks such as physics simulations and image processing, where the RTX 4070 Mobile's 144 tensor cores may contribute to the advantage.

The legacy DirectX tests show smaller but still decisive margins. DirectX 9 gives 223 versus 184 (21.2% delta), DirectX 10 gives 116 versus 87 (33.3% delta), and DirectX 11 gives 179 versus 136 (31.6% delta). These older APIs are less relevant for new games but matter for backward compatibility with older titles.

The PassMark G2D test is the closest result, with 763 versus 728, a 4.8% delta. This indicates that 2D acceleration is not a differentiator between these two GPUs, and users focused solely on desktop workloads would see little practical difference.

FAQ

Q: Which GPU has the higher average benchmark score?

A: The NVIDIA GeForce RTX 4070 Mobile averages 27,435 points across its recorded tests, while the AMD Radeon RX 6600M averages 23,273 points.

Q: How large is the performance gap in DirectX 12?

A: The RTX 4070 Mobile scores 85 points in PassMark DirectX 12 versus 52 points for the RX 6600M, a 63.5% advantage. This is the largest delta in the head-to-head dataset.

Q: Are there any benchmarks where the RX 6600M wins?

A: No. The recorded data shows the RTX 4070 Mobile winning all nine head-to-head benchmark comparisons, with the closest margin being 4.8% in PassMark G2D.

Q: How do these GPUs compare to their nearest rivals in the database?

A: The RTX 4070 Mobile's nearest rival is the AMD Radeon RX 6700 XT with a delta of 0%, and it trails the NVIDIA GeForce RTX 3090 by 0.5%. The RX 6600M's nearest rival is the AMD Radeon R9 M290X with a delta of 0%.

Q: What is the difference in memory bandwidth?

A: The RTX 4070 Mobile has a memory bandwidth of 256.0 GB/s, while the RX 6600M has 224.0 GB/s. Both use 8 GB of GDDR6 memory on a 128-bit bus.

Q: Which GPU has a higher percentile ranking among all GPUs?

A: The RTX 4070 Mobile ranks at the 73rd percentile, while the RX 6600M ranks at the 68th percentile.

Architecture Differences

The RTX 4070 Mobile is built on the AD106 chip using NVIDIA's Ada Lovelace architecture, fabricated on a 5 nm process at TSMC. It contains 22,900 million transistors on a die size of 188 mm², yielding a transistor density of 121.8 million per square millimeter. The RX 6600M uses the Navi 23 chip with RDNA 2.0 architecture, fabricated on a 7 nm process, also at TSMC. It contains 11,060 million transistors on a larger die of 237 mm², resulting in a transistor density of 46.7 million per square millimeter.

The compute configuration differs substantially. The RTX 4070 Mobile has 4,608 shading units, 144 texture mapping units, and 48 raster output units. It also includes 36 ray tracing cores and 144 tensor cores. The RX 6600M has 1,792 shading units, 112 TMUs, and 64 ROPs, with 28 ray tracing cores and no tensor cores. The NVIDIA part's higher shading unit count is offset by the AMD part's higher ROP count, yet the measured performance still favors NVIDIA decisively.

Clock speeds follow an interesting pattern. The RX 6600M has a higher base clock of 2068 MHz and boost clock of 2416 MHz, with a game clock of 2177 MHz. The RTX 4070 Mobile has a base clock of 1395 MHz and boost clock of 1695 MHz. Despite the lower clocks, the RTX 4070 Mobile achieves higher performance, indicating that architectural efficiency and the larger shader array compensate for the clock disadvantage.

Memory configurations are similar on the surface: both have 8 GB of GDDR6 on a 128-bit bus. The NVIDIA part runs memory at 2000 MHz with 16 Gbps effective speed, delivering 256.0 GB/s of bandwidth. The AMD part runs at 1750 MHz with 14 Gbps effective speed, delivering 224.0 GB/s. The NVIDIA GPU has a 14.3% bandwidth advantage.

The rated power draw differs, with the RTX 4070 Mobile at 115 W and the RX 6600M at 100 W. Both are classified as IGP slot width with no power connectors, meaning they are designed for mobile implementations where the motherboard provides power. The higher power envelope of the NVIDIA part likely contributes to its performance advantage.

The API support is identical for both GPUs: DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The RTX 4070 Mobile supports FP16 at a 1:1 ratio with FP32, while the RX 6600M supports FP16 at a 2:1 ratio. The NVIDIA part's FP32 throughput is 15.62 TFLOPS, while the AMD part is 8.659 TFLOPS. The RX 6600M does achieve higher FP16 throughput at 17.32 TFLOPS, but this advantage does not appear in the recorded benchmarks.

The release timeline shows the RX 6600M launching in May 2021 and the RTX 4070 Mobile in January 2023. The RX 6600M is marked as end-of-life, while the RTX 4070 Mobile remains active. The NVIDIA part's successor is listed as the GeForce 50 Mobile, while the AMD part has no listed successor. Both use a PCIe 4.0 x8 bus interface. The RX 6600M's predecessor is listed as Polaris Mobile, while the RTX 4070 Mobile's predecessor is the GeForce 30 Mobile series.