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

FAQ

Q: Which GPU is faster in the database's average benchmark score?

A: The NVIDIA GeForce RTX 4070 Mobile leads with an average benchmark score of 27,435, while the AMD Radeon RX 6600 XT scores 24,442. That is a 12.2% advantage for the NVIDIA part in aggregate performance.

Q: How do these two GPUs rank against all other GPUs in the database?

A: The RTX 4070 Mobile sits at the 73rd percentile of all GPUs, while the RX 6600 XT sits at the 70th percentile. Both are above the median, but NVIDIA's mobile part places higher in the overall distribution.

Q: What is the largest single benchmark win for each GPU?

A: The RTX 4070 Mobile's biggest win comes in Geekbench Vulkan, where it scores 108,367 versus 72,417, a 49.6% lead. The RX 6600 XT's only win is in Passmark G2D, scoring 912 versus 763, which is a 16.3% advantage for AMD.

Q: Which GPU has the higher FP32 compute throughput?

A: The RTX 4070 Mobile delivers 15.62 TFLOPS of FP32, while the RX 6600 XT delivers 10.60 TFLOPS. The NVIDIA part is roughly 47% ahead in raw single-precision floating-point rate.

Q: Do both GPUs support the same modern graphics APIs?

A: Yes. Both the RTX 4070 Mobile and the RX 6600 XT support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Their API feature sets are effectively aligned.

Q: What are the memory specifications for each GPU?

A: Both GPUs have 8 GB of GDDR6 memory on a 128-bit bus with a 256.0 GB/s bandwidth. There is no difference in memory size, bus width, or bandwidth between them.

The Verdict

The benchmark data consistently favors the NVIDIA GeForce RTX 4070 Mobile in compute-heavy and graphics-heavy workloads. It wins 8 of the 9 head-to-head comparisons, including all DirectX tests and both Geekbench compute tests. The RX 6600 XT is a capable alternative only in 2D performance, where it leads by 16.3% in Passmark G2D. For users prioritizing raw 3D rendering, compute, and modern API performance, the RTX 4070 Mobile is the stronger pick. For scenarios that involve 2D graphics workloads or where a desktop card form factor is required, the RX 6600 XT holds a narrow but real advantage. The data also shows the RTX 4070 Mobile ranks higher overall, at the 73rd percentile versus the 70th percentile, reinforcing its position as the better-rounded performer.

Head-to-Head Benchmarks

The RTX 4070 Mobile dominates the Geekbench compute tests. In Geekbench OpenCL, it scores 109,197 against the RX 6600 XT's 80,503, a 35.6% margin. In Geekbench Vulkan, the gap widens to 49.6%, with scores of 108,367 versus 72,417. These results indicate a substantial advantage in general-purpose compute and Vulkan-based workloads, likely stemming from the NVIDIA part's higher shader count and FP32 throughput.

DirectX benchmark results follow a similar pattern. In Passmark DirectX 12, the RTX 4070 Mobile scores 85 versus 61, a 39.3% lead. Passmark DirectX 11 shows a 9.8% advantage (179 versus 163), and Passmark DirectX 9 shows a 14.9% lead (223 versus 194). Even in Passmark DirectX 10, the NVIDIA part wins by 6.4% (116 versus 109). Across the DirectX suite, the RTX 4070 Mobile is consistently ahead, with the largest margin appearing in the most modern API version.

The Passmark G3D score, which represents overall 3D graphics performance, gives the RTX 4070 Mobile a 19% win: 19,587 versus 16,461. This aligns with the average benchmark score difference of 12.2%, confirming that the NVIDIA part is the stronger 3D performer in the database. The Passmark GPU Compute test also favors NVIDIA, with 8,399 versus 7,520, an 11.7% margin.

The RX 6600 XT's sole victory comes in Passmark G2D, where it scores 912 against 763, a 16.3% lead. This is a meaningful result for 2D desktop workloads, but it does not compensate for the losses in every other category. The data shows a clear split: NVIDIA wins all 3D and compute tests, AMD wins the single 2D test.

In terms of nearest rivals, the RTX 4070 Mobile sits between the NVIDIA GeForce RTX 3090 (average score 27,565, 0.5% higher) and the AMD Radeon RX 6700 XT (27,425, effectively tied at 0% delta). The RX 6600 XT, by contrast, sits near the NVIDIA GeForce GTX 1630 (24,277, 0.7% lower), the Intel Arc A350M (24,647, 0.8% higher), and the NVIDIA GeForce RTX 2080 SUPER (24,170, 1.1% lower). This places the two GPUs in different performance tiers, with the RTX 4070 Mobile competing against high-end desktop cards and the RX 6600 XT competing against mid-range and older high-end parts.

Specification Differences

The RTX 4070 Mobile is built on a 5 nm process at TSMC, while the RX 6600 XT uses a 7 nm process, also at TSMC. The NVIDIA chip, AD106, contains 22,900 million transistors on a 188 mm² die, with a transistor density of 121.8 million per mm². The AMD chip, Navi 23, contains 11,060 million transistors on a 237 mm² die, with a density of 46.7 million per mm². Despite having roughly half the transistor count, the AMD die is larger due to the older process node.

Clock speeds differ significantly. The RX 6600 XT has a base clock of 1968 MHz and a boost clock of 2589 MHz, with a game clock of 2359 MHz. The RTX 4070 Mobile has a base clock of 1395 MHz and a boost clock of 1695 MHz. The AMD part runs at much higher frequencies, but the NVIDIA part compensates with a larger shader array.

The RTX 4070 Mobile has 4,608 shading units, 144 texture mapping units, and 48 raster operation units. The RX 6600 XT has 2,048 shading units, 128 TMUs, and 64 ROPs. The NVIDIA part has more than double the shader count and more TMUs, while the AMD part has more ROPs. The RTX 4070 Mobile also features 36 ray tracing cores and 144 tensor cores, while the RX 6600 XT has 32 ray tracing cores and no tensor cores listed.

Pixel and texture rates differ accordingly. The RX 6600 XT achieves 165.7 GPixel/s and 331.4 GTexel/s, while the RTX 4070 Mobile achieves 81.36 GPixel/s and 244.1 GTexel/s. The AMD part is faster in both rasterization throughput metrics despite its lower shader count, due to its higher clocks and ROP count.

Power specifications diverge. The RTX 4070 Mobile has a TDP of 115 W, while the RX 6600 XT has a TDP of 160 W. The NVIDIA part is an IGP with no power connectors and a slot width of IGP, while the AMD part is a dual-slot card with a single 8-pin power connector and a suggested PSU of 450 W. The RX 6600 XT has physical dimensions of 190 mm in length, 110 mm in height, and 40 mm in width.

The RX 6600 XT has a specified launch MSRP of 379 USD. The RTX 4070 Mobile has no launch MSRP in the database. The RX 6600 XT was released on 2021-07-29 and is marked as end-of-life, while the RTX 4070 Mobile was released on 2023-01-02 and is marked as active.

Architecture Differences

The RTX 4070 Mobile is based on the Ada Lovelace architecture, while the RX 6600 XT is based on RDNA 2.0. This is a fundamental generational split: Ada Lovelace is NVIDIA's latest mobile architecture, designed around the AD106 chip, while RDNA 2.0 is AMD's previous-generation architecture, using the Navi 23 chip. The RTX 4070 Mobile belongs to the GeForce 40-series and the GeForce 40 Mobile generation, with a predecessor in GeForce 30 Mobile and a successor in GeForce 50 Mobile. The RX 6600 XT belongs to the Radeon RX 6000 series and the Navi II (RX 6000) generation, with a predecessor in Navi and a successor in Navi III.

The process node difference is significant: 5 nm for the RTX 4070 Mobile versus 7 nm for the RX 6600 XT. This explains the transistor density disparity, with the NVIDIA part packing 121.8 million transistors per mm² versus 46.7 million per mm² for AMD. The RTX 4070 Mobile achieves this density with a smaller die (188 mm²) and more transistors (22,900 million), while the RX 6600 XT uses a larger die (237 mm²) with fewer transistors (11,060 million).

Ray tracing capabilities exist on both GPUs, with 36 RT cores on the NVIDIA part and 32 on the AMD part. However, the RTX 4070 Mobile also includes 144 tensor cores, which are absent from the RX 6600 XT's specification sheet. This suggests that AI-accelerated workloads, such as those leveraging DLSS or similar tensor-core features, are only supported on the NVIDIA part.

FP16 throughput differs in ratio. The RTX 4070 Mobile delivers 15.62 TFLOPS of FP16 at a 1:1 ratio with FP32, meaning it does not gain extra throughput for half-precision work. The RX 6600 XT delivers 21.21 TFLOPS of FP16 at a 2:1 ratio, meaning it can process half-precision data at roughly twice its FP32 rate. This makes the AMD part more efficient for FP16-heavy compute tasks, despite its lower FP32 peak.

Both GPUs use the same memory architecture: 8 GB of GDDR6 on a 128-bit bus with 256.0 GB/s bandwidth. Memory clocks are also identical at 2000 MHz with 16 Gbps effective. The bus interface is PCIe 4.0 x8 for both. Display outputs differ, with the RTX 4070 Mobile being portable-device dependent and the RX 6600 XT featuring 1x HDMI 2.1 and 3x DisplayPort 1.4a.

The production status of the two GPUs reflects their market positioning. The RTX 4070 Mobile is active, while the RX 6600 XT is end-of-life. This means the NVIDIA part is still in production, whereas the AMD part has been discontinued. The release dates also differ by roughly 18 months, with the RX 6600 XT launching in 2021 and the RTX 4070 Mobile launching in 2023.