AMD Radeon RX 6600M vs NVIDIA RTX A5000 Mobile Comparison

The NVIDIA RTX A5000 Mobile and AMD Radeon RX 6600M represent two distinct approaches to mobile graphics, separated by architecture, process technology, and intended workloads. The data shows a clear performance hierarchy, with the RTX A5000 Mobile winning 6 of 9 head-to-head benchmarks and holding a substantial lead in average benchmark score, but the RX 6600M counters with wins in DirectX 11, DirectX 9, and 2D tests. This analysis breaks down the architectural differences, benchmark results, and specification gaps to determine which GPU suits which use case.

FAQ

Q: Which GPU has the higher average benchmark score?

A: The NVIDIA RTX A5000 Mobile leads with an average benchmark score of 24,763, compared to 23,273 for the AMD Radeon RX 6600M, a difference of roughly 6.4%.

Q: How do the two GPUs compare in raw compute performance?

A: The RTX A5000 Mobile delivers 19.35 TFLOPS of FP32 performance, while the RX 6600M offers 8.659 TFLOPS. In FP16, the RTX A5000 Mobile again leads with 19.35 TFLOPS (1:1 ratio), whereas the RX 6600M achieves 17.32 TFLOPS (2:1 ratio).

Q: Which GPU has more memory, and does it matter?

A: The RTX A5000 Mobile features 16 GB of GDDR6 memory on a 256-bit bus with 448.0 GB/s bandwidth, while the RX 6600M has 8 GB on a 128-bit bus with 224.0 GB/s bandwidth. The RTX A5000 Mobile offers double the capacity and bandwidth.

Q: What are the standout benchmark wins for the AMD Radeon RX 6600M?

A: The RX 6600M wins in Passmark DirectX 11 (136 vs 133, a 2.2% margin), Passmark DirectX 9 (184 vs 169, an 8.2% margin), and Passmark G2D (728 vs 629, a 13.6% margin).

Q: What is the largest performance gap in either direction?

A: The largest gap is in Geekbench OpenCL, where the RTX A5000 Mobile scores 110,877 against 67,765 for the RX 6600M, a 63.6% advantage.

Q: Which GPU has the higher transistor density despite a smaller process node?

A: The RX 6600M uses a 7 nm TSMC process and achieves a transistor density of 46.7M per mm², while the RTX A5000 Mobile uses an 8 nm Samsung process with 44.4M per mm², despite having more total transistors.

Architecture Differences

The architectural divide is fundamental. The RTX A5000 Mobile is built on NVIDIA’s Ampere architecture using the GA104 chip, fabricated on Samsung’s 8 nm process. It packs 17,400 million transistors into a 392 mm² die. The RX 6600M uses AMD’s RDNA 2.0 architecture with the Navi 23 chip, manufactured by TSMC on a 7 nm process, housing 11,060 million transistors on a 237 mm² die. The smaller 7 nm node allows the RX 6600M to achieve a higher transistor density (46.7M vs 44.4M per mm²) despite fewer total transistors.

Shader configuration differs sharply. The RTX A5000 Mobile features 6,144 shading units, 192 TMUs, and 96 ROPs, alongside 48 ray tracing cores and 192 tensor cores. The RX 6600M counters with 1,792 shading units, 112 TMUs, and 64 ROPs, plus 28 ray tracing cores but no tensor cores. This massive disparity in shader count explains the RTX A5000 Mobile’s FP32 output of 19.35 TFLOPS versus 8.659 TFLOPS for the RX 6600M.

Clock speeds invert the efficiency story. The RX 6600M runs at a base clock of 2068 MHz and boosts to 2416 MHz, with a game clock of 2177 MHz. The RTX A5000 Mobile is far more conservative, with a 900 MHz base and 1575 MHz boost. Despite lower clocks, the RTX A5000 Mobile achieves higher pixel rate (151.2 GPixel/s vs 154.6 GPixel/s for the RX 6600M) and texture rate (302.4 GTexel/s vs 270.6 GTexel/s). Memory architecture also diverges: the RTX A5000 Mobile uses a 256-bit bus with 16 GB and 448.0 GB/s bandwidth, while the RX 6600M uses a 128-bit bus with 8 GB and 224.0 GB/s. Both support PCIe 4.0, but the RTX A5000 Mobile uses x16 lanes versus x8 for the RX 6600M. Power draw favors the AMD part at 100 W TDP versus 150 W for NVIDIA, and the RX 6600M is listed as an IGP form factor.

Head-to-Head Benchmarks

The benchmarking data reveals a lopsided contest in compute-heavy workloads, with the RTX A5000 Mobile dominating. In Geekbench OpenCL, the RTX A5000 Mobile scores 110,877 against 67,765 for the RX 6600M, a commanding 63.6% lead. This gap narrows in Geekbench Vulkan, where the RTX A5000 Mobile posts 88,144 versus 73,740, still a 19.5% advantage. These results align with the FP32 compute disparity, as the RTX A5000 Mobile has more than double the shading units and TFLOPS.

DirectX 12 performance also favors NVIDIA. The RTX A5000 Mobile scores 72 in Passmark DirectX 12, while the RX 6600M trails at 52, a 38.5% difference. Similarly, in Passmark DirectX 10, the RTX A5000 Mobile leads 115 to 87, a 32.2% margin. The Passmark G3D test, which aggregates general 3D rendering, shows the RTX A5000 Mobile at 15,779 versus 13,929 for the RX 6600M, a 13.3% win. In Passmark GPU Compute, the RTX A5000 Mobile scores 6,945 against 5,646 for the RX 6600M, a 23% advantage.

The RX 6600M’s wins are narrower but notable. In Passmark DirectX 11, it edges out the RTX A5000 Mobile 136 to 133, a 2.2% margin. The DirectX 9 legacy test shows a larger win for AMD: 184 vs 169, an 8.2% advantage. The most significant AMD victory comes in Passmark G2D, a 2D graphics test, where the RX 6600M scores 728 against 629, a 13.6% lead. These wins suggest the RX 6600M has stronger legacy API and 2D performance, likely due to its higher clock speeds.

Across all nine head-to-head tests, the RTX A5000 Mobile claims six wins to three for the RX 6600M. The average benchmark score reinforces this: 24,763 for NVIDIA versus 23,273 for AMD. However, the RX 6600M’s percentile ranking (68th vs 70th) is close, indicating that in real-world mixed workloads, the gap may be less pronounced than raw compute numbers suggest. The nearest rivals for the RTX A5000 Mobile include the AMD Radeon RX 590 (0.1% delta) and Intel Arc A350M (0.5% delta), while the RX 6600M sits near the AMD Radeon R9 M290X (0% delta) and AMD Radeon Pro Vega 16 (0.1% delta).

The Verdict

The data points to a clear split based on workload. For users prioritizing raw compute, ray tracing, and high-resolution textures, the NVIDIA RTX A5000 Mobile is the superior choice. Its 16 GB memory pool and 448.0 GB/s bandwidth provide double the capacity and bandwidth of the RX 6600M, making it better suited for professional applications, large datasets, and modern DirectX 12 titles. The 63.6% lead in Geekbench OpenCL and 38.5% lead in DirectX 12 underscore its compute dominance. The 192 tensor cores also give it an edge in AI-accelerated tasks, a feature entirely absent from the RX 6600M.

Conversely, the AMD Radeon RX 6600M appeals to users focused on legacy software and 2D workloads. Its wins in DirectX 9 (8.2%) and DirectX 11 (2.2%) suggest better compatibility with older games and applications. The 13.6% advantage in Passmark G2D indicates stronger 2D rendering, which could benefit desktop or productivity use cases. Its higher clocks (2416 MHz boost) and lower TDP (100 W vs 150 W) make it a more power-efficient option for thin-and-light laptops where thermal headroom is limited. The 7 nm process also means a smaller die (237 mm²) and fewer transistors (11,060 million), which may translate to lower manufacturing costs, though pricing data is not available.

In terms of positioning, the RTX A5000 Mobile sits at the 70th percentile of all GPUs, while the RX 6600M is at the 68th. The average benchmark scores (24,763 vs 23,273) show a 6.4% overall edge for NVIDIA. However, the RX 6600M’s nearest rivals include the NVIDIA P106-100 (0.1% delta) and AMD Radeon AI PRO R9700 (-0.2% delta), indicating it competes in a similar tier. The RTX A5000 Mobile’s nearest rivals, including the RX 6600 XT (1.3% delta), show it sits slightly above the RX 6600M’s class. For users who need maximum compute and memory, the RTX A5000 Mobile is the data-backed pick. For those prioritizing efficiency and legacy API performance, the RX 6600M offers a compelling alternative. Both are end-of-life products, but their benchmark profiles remain relevant for comparing mobile GPU generations.

Specification Differences

The two GPUs differ across nearly every core specification, reflecting their divergent architectures and market positions.

• Process Node: RTX A5000 Mobile uses 8 nm (Samsung); RX 6600M uses 7 nm (TSMC).
• Transistors: RTX A5000 Mobile has 17,400 million; RX 6600M has 11,060 million.
• Die Size: RTX A5000 Mobile measures 392 mm²; RX 6600M measures 237 mm².
• Transistor Density: RTX A5000 Mobile achieves 44.4M per mm²; RX 6600M achieves 46.7M per mm².
• Base Clock: RTX A5000 Mobile runs at 900 MHz; RX 6600M at 2068 MHz.
• Boost Clock: RTX A5000 Mobile boosts to 1575 MHz; RX 6600M to 2416 MHz.
• Game Clock: RTX A5000 Mobile has none listed; RX 6600M has 2177 MHz.
• Memory Size: RTX A5000 Mobile has 16 GB; RX 6600M has 8 GB.
• Memory Bus Width: RTX A5000 Mobile uses 256 bit; RX 6600M uses 128 bit.
• Memory Bandwidth: RTX A5000 Mobile delivers 448.0 GB/s; RX 6600M delivers 224.0 GB/s.
• Shading Units: RTX A5000 Mobile has 6,144; RX 6600M has 1,792.
• TMUs: RTX A5000 Mobile has 192; RX 6600M has 112.
• ROPs: RTX A5000 Mobile has 96; RX 6600M has 64.
• Ray Tracing Cores: RTX A5000 Mobile has 48; RX 6600M has 28.
• Tensor Cores: RTX A5000 Mobile has 192; RX 6600M has none.
• Pixel Rate: RTX A5000 Mobile achieves 151.2 GPixel/s; RX 6600M achieves 154.6 GPixel/s.
• Texture Rate: RTX A5000 Mobile achieves 302.4 GTexel/s; RX 6600M achieves 270.6 GTexel/s.
• FP32 Performance: RTX A5000 Mobile delivers 19.35 TFLOPS; RX 6600M delivers 8.659 TFLOPS.
• FP16 Performance: RTX A5000 Mobile delivers 19.35 TFLOPS (1:1); RX 6600M delivers 17.32 TFLOPS (2:1).
• TDP: RTX A5000 Mobile consumes 150 W; RX 6600M consumes 100 W.
• Bus Interface: RTX A5000 Mobile uses PCIe 4.0 x16; RX 6600M uses PCIe 4.0 x8.
• Slot Width: RTX A5000 Mobile has none listed; RX 6600M is listed as IGP.
• Release Date: RTX A5000 Mobile launched on 2021-04-11; RX 6600M on 2021-05-30.
• Predecessor: RTX A5000 Mobile follows Quadro Turing-M; RX 6600M follows Polaris Mobile.
• Successor: RTX A5000 Mobile has Ada-MW; RX 6600M has none listed.