AMD Radeon RX 6600M vs NVIDIA Quadro RTX 5000 Comparison

The AMD Radeon RX 6600M and NVIDIA Quadro RTX 5000 represent two very different philosophies for mobile graphics, separated by process node, architecture, and intended workload. The benchmark data reveals a clear but nuanced picture: the NVIDIA Quadro RTX 5000 wins 8 of the 9 direct head-to-head comparisons, yet the AMD Radeon RX 6600M posts a higher average benchmark score (23273 vs 21629) and a better percentile ranking among all GPUs (68th vs 67th). This contradiction—where the older, larger, more power-hungry card wins most individual tests but loses the aggregate—sets the stage for a detailed examination of what each GPU actually does best.

Head-to-Head Benchmarks

The NVIDIA Quadro RTX 5000 dominates the raw compute and DirectX-focused tests. In Geekbench Vulkan, it scores 92309 against the RX 6600M's 73740, a 20.1% advantage. The gap narrows but remains significant in Geekbench OpenCL, where the Quadro's 78999 beats the Radeon's 67765 by 14.2%. These are the largest deltas in the entire comparison, signaling that NVIDIA's Turing architecture handles general-purpose compute and Vulkan graphics workloads with substantially more authority.

The DirectX suite tells a similar story, though the margins vary widely. The most lopsided result is Passmark DirectX 10, where the Quadro RTX 5000 scores 113 versus the RX 6600M's 87, a 23% lead. DirectX 12 shows an 11.9% gap (59 vs 52), while DirectX 11 is nearly a tie—the Quadro's 140 barely edges out the Radeon's 136 at just 2.9%. Even DirectX 9, an older API, favors NVIDIA at 195 vs 184 (5.6%). The Passmark G3D score, a holistic 3D graphics measure, gives the Quadro a 10.8% win (15616 vs 13929), and Passmark GPU Compute shows a 13.5% advantage (6525 vs 5646).

The AMD Radeon RX 6600M's sole victory comes in Passmark G2D, a 2D graphics and desktop compositing test. It scores 728 versus the Quadro's 709, a 2.7% margin. This is a narrow win, but it is the only head-to-head where the Radeon comes out ahead, and it hints at a possible efficiency or driver optimization advantage in less demanding, latency-sensitive tasks. Notably, the RX 6600M does not appear in the head-to-head for 3DMark Steel Nomad, despite having a score of 1495 in its own benchmark list, meaning the comparison set lacks that specific data point for the Quadro.

Architecture Differences

The two GPUs are built on fundamentally different process nodes and architectures. The AMD Radeon RX 6600M uses the Navi 23 chip on TSMC's 7 nm process, packing 11,060 million transistors into a 237 mm² die. This yields a transistor density of 46.7 million per mm². In contrast, the NVIDIA Quadro RTX 5000 uses the TU104 chip on TSMC's 12 nm process, with 13,600 million transistors spread across a much larger 545 mm² die, resulting in a lower density of 25.0 million per mm². The Radeon's newer node allows it to achieve higher clock speeds—2068 MHz base and 2416 MHz boost versus the Quadro's 1620 MHz base and 1815 MHz boost—while consuming far less power (100 W TDP vs 230 W TDP).

Core configurations differ dramatically. The Quadro RTX 5000 has 3072 shading units, 192 texture mapping units, and 64 ROPs, plus 48 RT cores and 384 tensor cores. The RX 6600M has 1792 shading units, 112 TMUs, and 64 ROPs, with 28 RT cores and no tensor cores. Despite having fewer shading units, the Radeon achieves a higher pixel rate (154.6 GPixel/s vs 116.2 GPixel/s) due to its clock advantage, but the Quadro wins in texture rate (348.5 GTexel/s vs 270.6 GTexel/s) and FP32 throughput (11.15 TFLOPS vs 8.659 TFLOPS). The Quadro also doubles the memory capacity (16 GB vs 8 GB) and bus width (256-bit vs 128-bit), delivering 448.0 GB/s of bandwidth versus the Radeon's 224.0 GB/s.

Power delivery and physical design further separate them. The Quadro is a dual-slot card requiring 1x 6-pin and 1x 8-pin power connectors, with a suggested PSU of 550 W. The RX 6600M is an IGP (integrated graphics processor) with no power connectors and no dedicated slot width, designed to be soldered onto a motherboard. The Quadro also offers fixed display outputs (4x DisplayPort 1.4a and 1x USB Type-C), while the Radeon's outputs are listed as "Portable Device Dependent." Both support DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, but the Quadro's tensor cores give it a feature the Radeon lacks entirely.

Where Each One Wins

The NVIDIA Quadro RTX 5000 is the clear winner for compute-heavy and modern graphics workloads. Its 14.2% lead in Geekbench OpenCL and 20.1% lead in Vulkan make it the stronger choice for applications that leverage these APIs, such as professional rendering, scientific simulation, and cross-platform game engines. The 23% margin in DirectX 10 and 11.9% in DirectX 12 further cement its position for legacy and current DirectX games, though the near-tie in DirectX 11 suggests the Radeon can hold its own in that specific API. The Quadro's 10.8% G3D win and 13.5% GPU Compute win indicate it is simply faster in most 3D rendering and general compute tasks.

The AMD Radeon RX 6600M wins only in Passmark G2D, a 2D rasterization test. This 2.7% margin is small, but it suggests the Radeon has an edge in tasks like desktop rendering, 2D image manipulation, or UI-heavy workloads that do not stress the 3D pipeline. Additionally, the Radeon's higher average benchmark score (23273 vs 21629) implies that across a broader set of tests—including the Geekbench Metal score of 92237, which the Quadro does not have—the AMD card may be more balanced. The Radeon's 68th percentile versus the Quadro's 67th percentile reinforces this, though the difference is marginal.

For power-sensitive mobile designs, the Radeon's 100 W TDP versus the Quadro's 230 W TDP is a decisive factor. The RX 6600M is an IGP with no power connectors, meaning it can be integrated into thinner, lighter laptops with smaller batteries. The Quadro, being a dual-slot card with external power, requires a larger chassis and robust cooling. The Radeon's PCIe 4.0 x8 interface also offers newer bus technology, though the Quadro's PCIe 3.0 x16 provides more lanes.

FAQ

Q: Why does the NVIDIA Quadro RTX 5000 win most benchmarks but have a lower average score than the AMD Radeon RX 6600M?

A: The average benchmark score (23273 for the Radeon vs 21629 for the Quadro) includes tests that are not in the head-to-head set, such as Geekbench Metal and 3DMark Steel Nomad, where the Radeon's scores (92237 and 1495 respectively) likely boost its average. The Quadro's percentile (67th) is also slightly lower than the Radeon's (68th), suggesting the aggregate picture differs from the direct comparison.

Q: Does the AMD Radeon RX 6600M have any advantage in memory capacity or bandwidth?

A: No. The Quadro RTX 5000 has 16 GB of GDDR6 memory on a 256-bit bus, yielding 448.0 GB/s bandwidth. The Radeon has 8 GB on a 128-bit bus, yielding 224.0 GB/s. The Quadro doubles both capacity and bandwidth.

Q: Are there any workloads where the AMD card is faster than the NVIDIA card?

A: Yes, in the Passmark G2D test, the Radeon scores 728 versus the Quadro's 709, a 2.7% lead. This is the only head-to-head test the Radeon wins, indicating a possible edge in 2D desktop or UI rendering tasks.

Q: What is the significance of the tensor cores in the Quadro RTX 5000?

A: The Quadro has 384 tensor cores, while the Radeon has none. Tensor cores are designed for AI and deep learning workloads, though the FACT PACK does not include specific benchmark scores for these tasks. This architectural feature gives the Quadro capabilities the Radeon cannot match.

Q: How do the clock speeds affect the performance difference?

A: The Radeon runs at higher clocks (2068 MHz base, 2416 MHz boost) versus the Quadro (1620 MHz base, 1815 MHz boost). This helps the Radeon achieve a higher pixel rate (154.6 GPixel/s vs 116.2 GPixel/s), but the Quadro's superior texture rate and FP32 throughput (11.15 TFLOPS vs 8.659 TFLOPS) show that raw clock speed is not enough to overcome the NVIDIA card's larger core count.

Q: Which GPU is more suitable for a thin-and-light laptop?

A: The AMD Radeon RX 6600M is an IGP with a 100 W TDP, no power connectors, and no dedicated slot width, making it suitable for compact designs. The Quadro RTX 5000 is a dual-slot card with a 230 W TDP and requires external power, necessitating a larger, more power-hungry laptop.

The Verdict

The data points to the NVIDIA Quadro RTX 5000 as the superior performer in almost every measurable benchmark. Its wins span 8 of 9 head-to-head tests, including all DirectX versions, both Geekbench compute APIs, and both Passmark 3D tests. The margins are decisive in compute-heavy tasks—20.1% in Vulkan, 14.2% in OpenCL, and 23% in DirectX 10—making it the obvious choice for users who prioritize raw graphics and compute performance. The Quadro's 16 GB memory and 448.0 GB/s bandwidth further support large datasets and high-resolution textures, which the Radeon's 8 GB and 224.0 GB/s cannot match.

However, the AMD Radeon RX 6600M should not be dismissed. Its higher average benchmark score (23273 vs 21629) and better percentile ranking (68th vs 67th) suggest it performs well across a wider range of tests, including those not in the head-to-head set. Its 100 W TDP and IGP form factor make it the only viable option for ultra-portable laptops, and its 2.7% win in Passmark G2D shows it can handle 2D tasks with a slight edge. For users who need a balance of performance and efficiency in a thin chassis, the Radeon is the logical pick. For users who need maximum compute power, professional-grade features like tensor cores, and are willing to accept a larger, hotter, more power-hungry device, the Quadro RTX 5000 is the clear winner.

Specification Differences

| Specification | AMD Radeon RX 6600M | NVIDIA Quadro RTX 5000 |

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

| Chip | Navi 23 | TU104 |

| Architecture | RDNA 2.0 | Turing |

| Process Node | 7 nm | 12 nm |

| Transistors | 11,060 million | 13,600 million |

| Die Size | 237 mm² | 545 mm² |

| Transistor Density | 46.7M / mm² | 25.0M / mm² |

| Base Clock | 2068 MHz | 1620 MHz |

| Boost Clock | 2416 MHz | 1815 MHz |

| Memory Size | 8 GB | 16 GB |

| Memory Bus Width | 128 bit | 256 bit |

| Memory Bandwidth | 224.0 GB/s | 448.0 GB/s |

| Shading Units | 1792 | 3072 |

| TMUs | 112 | 192 |

| RT Cores | 28 | 48 |

| Tensor Cores | None | 384 |

| Pixel Rate | 154.6 GPixel/s | 116.2 GPixel/s |

| Texture Rate | 270.6 GTexel/s | 348.5 GTexel/s |

| FP32 Performance | 8.659 TFLOPS | 11.15 TFLOPS |

| FP16 Performance | 17.32 TFLOPS (2:1) | 22.30 TFLOPS (2:1) |

| TDP | 100 W | 230 W |

| Slot Width | IGP | Dual-slot |

| Power Connectors | None | 1x 6-pin + 1x 8-pin |

| Suggested PSU | None | 550 W |

| Bus Interface | PCIe 4.0 x8 | PCIe 3.0 x16 |

| Display Outputs | Portable Device Dependent | 4x DisplayPort 1.4a, 1x USB Type-C |

| Release Date | 2021-05-30 | 2018-08-12 |

| Predecessor | Polaris Mobile | Quadro Volta |

| Successor | None | Workstation Ampere |

| Launch MSRP | None | 2,299 USD |