AMD Radeon RX 6600M vs NVIDIA GeForce RTX 4060 Mobile Comparison

The AMD Radeon RX 6600M and NVIDIA GeForce RTX 4060 Mobile are both 8 GB laptop GPUs, but they represent different generations of mobile graphics. The data shows a decisive performance gap: the RTX 4060 Mobile wins all nine head-to-head benchmark comparisons, with the RX 6600M trailing by margins ranging from a negligible 0.3% in 2D tests to a substantial 28.8% in DirectX 12 workloads. While the RX 6600M holds a higher percentile rank among all GPUs (68th vs. 67th), the RTX 4060 Mobile's lead in modern API tests and compute performance makes it the stronger option for current gaming and content creation workloads.

Head-to-Head Benchmarks

The RTX 4060 Mobile dominates the comparison in every single benchmark category. The largest margin of victory comes in the Passmark DirectX 12 test, where the NVIDIA GPU scores 73 against the AMD's 52, a delta of -28.8%. This is a significant gap that suggests the RTX 4060 Mobile is far better optimized for the latest graphics API, which is critical for modern AAA titles. Similarly, in the Passmark DirectX 10 test, the RTX 4060 Mobile's score of 107 is 18.7% higher than the RX 6600M's 87.

In compute-heavy workloads, the NVIDIA GPU also asserts its dominance. The Geekbench OpenCL score for the RTX 4060 Mobile is 89,420, which is 24.2% ahead of the RX 6600M's 67,765. The Vulkan results tell a similar story: the RTX 4060 Mobile scores 89,569, a 17.7% improvement over the AMD's 73,740. The Passmark GPU Compute test further confirms this, with the RTX 4060 Mobile's 6,816 score beating the RX 6600M's 5,646 by 17.2%.

The overall 3D graphics performance, as measured by Passmark G3D, also favors the NVIDIA card. The RTX 4060 Mobile achieves a score of 17,469, which is 20.3% higher than the RX 6600M's 13,929. Even in the legacy DirectX 9 and DirectX 11 tests, the pattern holds, with the RTX 4060 Mobile leading by 14.8% and 13.4%, respectively. The only close contest is in the Passmark G2D test, where the RTX 4060 Mobile's 730 score is just 0.3% above the RX 6600M's 728, indicating that 2D desktop performance is effectively a tie.

Architecture Differences

The two GPUs are built on fundamentally different architectures and process nodes. The AMD Radeon RX 6600M is based on the Navi 23 chip using the RDNA 2.0 architecture, manufactured on a 7 nm TSMC process. In contrast, the NVIDIA GeForce RTX 4060 Mobile uses the AD107 chip with the newer Ada Lovelace architecture, built on a more advanced 5 nm TSMC process. This process advantage is reflected in the transistor density: the RTX 4060 Mobile packs 118.9M transistors per mm² across its 159 mm² die, while the RX 6600M has a density of 46.7M / mm² on a larger 237 mm² die. The RTX 4060 Mobile also has a higher total transistor count at 18,900 million compared to 11,060 million.

The compute configurations differ significantly as well. The RTX 4060 Mobile features 3,072 shading units, which is substantially more than the RX 6600M's 1,792. However, the AMD card has more texture mapping units (112 vs. 96) and more render output units (64 vs. 48). For ray tracing, the RX 6600M has 28 RT cores, while the RTX 4060 Mobile has 24. Crucially, the NVIDIA chip includes 96 tensor cores, which the AMD card lacks entirely.

Clock speeds show a trade-off between the two. The RX 6600M has a higher base clock of 2068 MHz and a boost clock of 2416 MHz, compared to the RTX 4060 Mobile's 1545 MHz base and 1890 MHz boost. Despite the lower clocks, the RTX 4060 Mobile achieves higher raw throughput thanks to its architecture. Its FP32 performance is rated at 11.61 TFLOPS, versus the RX 6600M's 8.659 TFLOPS. Notably, the RX 6600M can achieve 17.32 TFLOPS in FP16 (2:1 ratio), while the RTX 4060 Mobile is capped at 11.61 TFLOPS (1:1 ratio).

Memory configurations are similar but not identical. Both have 8 GB of GDDR6 on a 128-bit bus, but the RTX 4060 Mobile's memory runs at 2000 MHz (16 Gbps effective), yielding a bandwidth of 256.0 GB/s. The RX 6600M's memory runs at 1750 MHz (14 Gbps effective), providing 224.0 GB/s. The RTX 4060 Mobile also has higher pixel and texture rates in theory, though the RX 6600M's rates appear higher on paper due to its clock advantage; the data lists the RX 6600M with 154.6 GPixel/s and 270.6 GTexel/s, versus the RTX 4060 Mobile's 90.72 GPixel/s and 181.4 GTexel/s. Both cards support DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Where Each One Wins

The RTX 4060 Mobile is the clear winner in nearly every scenario. Its performance in DirectX 12 and Vulkan, where it leads by 28.8% and 17.7% respectively, makes it the superior choice for modern gaming engines that rely on these APIs. The 24.2% lead in OpenCL and 17.2% lead in GPU compute also position it as the better option for productivity tasks like video rendering, machine learning inference (thanks to its 96 tensor cores), and other GPU-accelerated workloads. The 20.3% advantage in Passmark G3D reinforces that it is simply a faster GPU for 3D rendering overall.

The RX 6600M's only area of relative strength is its higher clock speeds and larger number of ROPs and TMUs. The data shows that in the Passmark G2D test, the RX 6600M is virtually tied with the RTX 4060 Mobile, with a score of 728 versus 730. This suggests that for basic 2D desktop work or applications that are not heavily GPU-bound, the experience would be nearly identical. However, the RX 6600M does not win a single benchmark in the head-to-head comparison, so there is no workload category where the data supports recommending it for superior performance.

The Verdict

Based strictly on the benchmark data, the NVIDIA GeForce RTX 4060 Mobile is the superior mobile GPU. It wins 100% of the head-to-head tests, with its biggest advantages in DirectX 12 (-28.8%), OpenCL (-24.2%), and overall 3D performance (-20.3%). The architecture differences explain this gap: the RTX 4060 Mobile's newer 5 nm Ada Lovelace design, higher shading unit count (3,072 vs. 1,792), and inclusion of tensor cores give it a significant computational advantage that clock speed alone cannot overcome for the RX 6600M.

For gamers, the RTX 4060 Mobile is the obvious pick. Its superior DirectX 12 and Vulkan performance ensures better frame rates in the latest titles, and its 256.0 GB/s memory bandwidth provides a 14.3% advantage over the RX 6600M's 224.0 GB/s. For content creators, the RTX 4060 Mobile's compute and OpenCL leads make it the more capable tool for rendering and GPU-accelerated tasks. The RX 6600M, while an end-of-life product from 2021, remains a competent GPU for less demanding games or older APIs, but the data shows it cannot match the RTX 4060 Mobile's performance in any measurable way. If you are choosing between these two, the RTX 4060 Mobile is the definitive choice based on the benchmark results.

FAQ

Q: Which GPU is faster in DirectX 12 benchmarks?

A: The NVIDIA GeForce RTX 4060 Mobile is significantly faster, scoring 73 in the Passmark DirectX 12 test compared to the AMD Radeon RX 6600M's 52, a difference of -28.8%.

Q: How does the memory bandwidth compare between the two cards?

A: The RTX 4060 Mobile has a memory bandwidth of 256.0 GB/s, while the RX 6600M offers 224.0 GB/s. Both have 8 GB of GDDR6 memory with a 128-bit bus.

Q: Does the RTX 4060 Mobile have any features that the RX 6600M lacks?

A: Yes, the RTX 4060 Mobile includes 96 tensor cores, whereas the RX 6600M has none. The RTX 4060 Mobile also has more shading units (3,072 vs. 1,792).

Q: What is the difference in transistor density between the two GPUs?

A: The RTX 4060 Mobile has a transistor density of 118.9M / mm², which is much higher than the RX 6600M's 46.7M / mm², reflecting its more advanced 5 nm process node.

Q: Which GPU has a higher boost clock speed?

A: The AMD Radeon RX 6600M has a higher boost clock of 2416 MHz, while the NVIDIA GeForce RTX 4060 Mobile boosts to 1890 MHz.

Q: Are there any benchmarks where the RX 6600M comes close to winning?

A: The closest result is in the Passmark G2D test, where the RX 6600M scores 728 and the RTX 4060 Mobile scores 730, a negligible 0.3% difference. The RX 6600M does not win any of the nine head-to-head benchmarks.