AMD Radeon RX 6600 XT vs NVIDIA Quadro RTX 8000 Comparison

Head-to-Head Benchmarks

The benchmark data paints a clear picture: the NVIDIA Quadro RTX 8000 dominates the AMD Radeon RX 6600 XT in nearly every measured category, winning 8 out of 9 head-to-head tests. The most decisive victory comes in Geekbench Vulkan, where the Quadro RTX 8000 scores 122,637 against the RX 6600 XT's 72,417, a massive 69.3% advantage. This gap highlights the Quadro's raw compute strength in modern graphics APIs, a crucial factor for professional workloads that leverage Vulkan compute.

Compute performance is another area of significant separation. In Passmark GPU Compute, the Quadro RTX 8000 scores 9,992 versus 7,520 for the RX 6600 XT, a 32.9% lead. Similarly, Geekbench OpenCL shows the Quadro ahead at 101,883 compared to 80,503, a 26.6% margin. These results indicate that the Quadro RTX 8000 is the superior choice for tasks like rendering, simulation, and scientific computing that rely heavily on general-purpose GPU compute.

DirectX performance also favors the Quadro across the board. In Passmark DirectX 12, the Quadro scores 79 versus 61 for the RX 6600 XT, a 29.5% edge. DirectX 11 shows a 15.3% lead (188 vs 163), DirectX 10 a 25.7% lead (137 vs 109), and even the legacy DirectX 9 test favors the Quadro by 8.8% (211 vs 194). The overall Passmark G3D score confirms the trend: 19,799 for the Quadro versus 16,461 for the RX 6600 XT, a 20.3% difference.

The single win for the AMD card comes in Passmark G2D, a 2D graphics test, where the RX 6600 XT scores 912 against the Quadro's 866, a 5% advantage. While this is a narrow victory, it suggests the AMD card has slightly stronger 2D performance, which could be relevant for desktop applications and basic display tasks. However, this one win does little to offset the Quadro's overwhelming lead in compute and 3D workloads.

The average benchmark scores reinforce the hierarchy. The Quadro RTX 8000 averages 28,421 across its benchmark suite, placing it in the 74th percentile of all GPUs, while the RX 6600 XT averages 24,442 and sits in the 70th percentile. The Quadro's nearest rivals in the database include the AMD Radeon R9 M295X (28,580, a 0.6% difference) and the NVIDIA GeForce GTX 980 Ti (28,020, a 1.4% difference), showing it competes with older high-end hardware. The RX 6600 XT's nearest rivals include the NVIDIA GeForce RTX 2080 SUPER (24,170, a 1.1% difference) and the Intel Arc A350M (24,647, a 0.8% difference), placing it in a much lower performance tier.

Architecture Differences

The two cards come from fundamentally different design philosophies. The NVIDIA Quadro RTX 8000 uses the TU102 chip built on Turing architecture, manufactured on a 12 nm process at TSMC. This is a massive chip with 18,600 million transistors on a die size of 754 mm², resulting in a transistor density of 24.7 million per square millimeter. The AMD Radeon RX 6600 XT uses the Navi 23 chip with RDNA 2.0 architecture, built on a more advanced 7 nm process, also at TSMC. It packs 11,060 million transistors on a much smaller 237 mm² die, achieving a higher density of 46.7 million per square millimeter.

Memory configurations differ substantially. The Quadro RTX 8000 carries 48 GB of GDDR6 memory on a 384-bit bus, delivering 672.0 GB/s of bandwidth. The RX 6600 XT has 8 GB of GDDR6 on a 128-bit bus, with 256.0 GB/s of bandwidth. This 2.6x difference in memory bandwidth and 6x difference in capacity makes the Quadro far more suitable for large datasets and high-resolution textures common in professional visualization.

The compute architectures diverge significantly. The Quadro RTX 8000 has 4,608 shading units, 288 texture mapping units, 96 render output units, 72 ray tracing cores, and 576 tensor cores. The RX 6600 XT has 2,048 shading units, 128 TMUs, 64 ROPs, and 32 ray tracing cores, with no tensor cores at all. These differences translate directly to peak performance: the Quadro delivers 16.31 TFLOPS of FP32 and 32.62 TFLOPS of FP16 (2:1 ratio), while the RX 6600 XT achieves 10.60 TFLOPS FP32 and 21.21 TFLOPS FP16 (2:1 ratio). The Quadro's tensor cores give it a unique advantage for AI and deep learning workloads, a capability the RX 6600 XT completely lacks.

Clock speeds also differ, with the RX 6600 XT running significantly faster. The AMD card has a base clock of 1968 MHz, a boost of 2589 MHz, and a game clock of 2359 MHz, while the Quadro runs at 1395 MHz base and 1770 MHz boost. Despite lower clocks, the Quadro's much larger chip and wider memory bus produce higher overall throughput. The RX 6600 XT's memory runs at 2000 MHz (16 Gbps effective), while the Quadro's runs at 1750 MHz (14 Gbps effective), but the Quadro's wider bus overcomes the lower speed.

FAQ

Q: Which card has better overall compute performance?

A: The NVIDIA Quadro RTX 8000 wins decisively. It leads by 26.6% in Geekbench OpenCL (101,883 vs 80,503) and by 32.9% in Passmark GPU Compute (9,992 vs 7,520), making it the stronger choice for compute-heavy workloads.

Q: Is the AMD Radeon RX 6600 XT better in any benchmark?

A: Yes, it wins the Passmark G2D test with a score of 912 versus 866 for the Quadro RTX 8000, a 5% advantage. This indicates slightly better 2D performance for desktop and display tasks.

Q: How much memory do these cards have and does it matter?

A: The Quadro RTX 8000 has 48 GB of GDDR6 on a 384-bit bus with 672.0 GB/s bandwidth, while the RX 6600 XT has 8 GB on a 128-bit bus with 256.0 GB/s. The Quadro's far larger capacity and bandwidth are critical for professional workloads like large scene rendering or massive datasets.

Q: Do these cards support ray tracing?

A: Yes, both support ray tracing. The Quadro RTX 8000 has 72 ray tracing cores, while the RX 6600 XT has 32. The Quadro also has 576 tensor cores for AI workloads, which the RX 6600 XT lacks entirely.

Q: What are the power requirements?

A: The Quadro RTX 8000 has a TDP of 260 W and requires a 600 W power supply with a 1x 6-pin + 1x 8-pin connector setup. The RX 6600 XT has a TDP of 160 W, needs a 450 W power supply, and uses a single 8-pin connector.

Q: Which card is newer?

A: The AMD Radeon RX 6600 XT was released on 2021-07-29, while the NVIDIA Quadro RTX 8000 was released on 2018-08-12. The RX 6600 XT is nearly three years newer and uses a more advanced 7 nm process node.

Specification Differences

| Specification | NVIDIA Quadro RTX 8000 | AMD Radeon RX 6600 XT |

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

| Architecture | Turing | RDNA 2.0 |

| Process Node | 12 nm | 7 nm |

| Transistors | 18,600 million | 11,060 million |

| Die Size | 754 mm² | 237 mm² |

| Transistor Density | 24.7M / mm² | 46.7M / mm² |

| Base Clock | 1395 MHz | 1968 MHz |

| Boost Clock | 1770 MHz | 2589 MHz |

| Memory Size | 48 GB | 8 GB |

| Memory Bus | 384 bit | 128 bit |

| Memory Bandwidth | 672.0 GB/s | 256.0 GB/s |

| Memory Clock | 1750 MHz (14 Gbps effective) | 2000 MHz (16 Gbps effective) |

| Shading Units | 4608 | 2048 |

| TMUs | 288 | 128 |

| ROPs | 96 | 64 |

| Ray Tracing Cores | 72 | 32 |

| Tensor Cores | 576 | None |

| FP32 Performance | 16.31 TFLOPS | 10.60 TFLOPS |

| FP16 Performance | 32.62 TFLOPS (2:1) | 21.21 TFLOPS (2:1) |

| Pixel Rate | 169.9 GPixel/s | 165.7 GPixel/s |

| Texture Rate | 509.8 GTexel/s | 331.4 GTexel/s |

| TDP | 260 W | 160 W |

| Power Connectors | 1x 6-pin + 1x 8-pin | 1x 8-pin |

| Suggested PSU | 600 W | 450 W |

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

| Display Outputs | 4x DisplayPort 1.4a, 1x USB Type-C | 1x HDMI 2.1, 3x DisplayPort 1.4a |

| Length | 267 mm (10.5 inches) | 190 mm (7.5 inches) |

| Height | 111 mm (4.4 inches) | 110 mm (4.3 inches) |

| Release Date | 2018-08-12 | 2021-07-29 |

| Launch MSRP | 9,999 USD | 379 USD |

The Verdict

The data clearly separates these two cards into distinct use cases. The NVIDIA Quadro RTX 8000 is the overwhelming winner in compute and 3D performance, taking 8 of 9 benchmark victories with margins ranging from 8.8% to 69.3%. Its 48 GB memory capacity, 672.0 GB/s bandwidth, and 576 tensor cores make it a workstation-class solution for professionals handling massive datasets, AI inference, and high-end visualization. The RX 6600 XT, by contrast, wins only the 2D test and offers a much smaller 8 GB frame buffer with 256.0 GB/s bandwidth.

For professional workloads, the Quadro RTX 8000 is clearly the superior choice. The 32.9% lead in Passmark GPU Compute and 26.6% lead in Geekbench OpenCL demonstrate its capability for rendering, simulation, and scientific computing. The presence of tensor cores further extends its utility to machine learning tasks, where the RX 6600 XT has no equivalent hardware. The Quadro's 260 W TDP and 600 W power supply requirement are reasonable trade-offs for this level of performance.

The AMD Radeon RX 6600 XT, despite its newer architecture and more efficient 7 nm process, cannot match the Quadro's raw throughput. Its higher clock speeds (2589 MHz boost vs 1770 MHz) and smaller die do not compensate for the Quadro's massive advantage in shading units (4,608 vs 2,048), memory bandwidth, and specialized cores. The RX 6600 XT's only benchmark win, a 5% margin in G2D, is unlikely to matter for serious graphics work.

Where Each One Wins

NVIDIA Quadro RTX 8000 wins in:

• Compute-intensive workloads: leading by 32.9% in Passmark GPU Compute and 26.6% in Geekbench OpenCL
• Modern graphics APIs: 69.3% ahead in Geekbench Vulkan and 29.5% ahead in Passmark DirectX 12
• General 3D performance: 20.3% ahead in Passmark G3D
• Legacy DirectX support: leading by 25.7% in DX10 and 8.8% in DX9
• DirectX 11 titles: 15.3% ahead
• Large memory requirements: 48 GB capacity versus 8 GB, with 672.0 GB/s bandwidth versus 256.0 GB/s
• AI and deep learning: unique 576 tensor cores provide dedicated hardware acceleration
• Professional visualization: higher pixel rate (169.9 GPixel/s vs 165.7 GPixel/s) and texture rate (509.8 GTexel/s vs 331.4 GTexel/s)

AMD Radeon RX 6600 XT wins in:

• 2D graphics performance: 5% ahead in Passmark G2D (912 vs 866)
• Power efficiency: 160 W TDP versus 260 W, requiring only a 450 W power supply versus 600 W
• Physical footprint: shorter at 190 mm versus 267 mm, and slightly lower at 110 mm versus 111 mm
• Newer platform support: PCIe 4.0 x8 interface versus PCIe 3.0 x16
• Display connectivity: includes HDMI 2.1 output, which the Quadro lacks
• Clock speeds: significantly higher base and boost clocks (1968 MHz / 2589 MHz vs 1395 MHz / 1770 MHz)