AMD Radeon RX 6600 vs NVIDIA Quadro RTX 4000 Comparison

The AMD Radeon RX 6600 and NVIDIA Quadro RTX 4000 are both end-of-life graphics cards, but they represent fundamentally different design philosophies. The RX 6600 is a modern, efficient gaming-oriented GPU from the Radeon RX 6000 series, built on RDNA 2.0, while the Quadro RTX 4000 is a professional workstation card from NVIDIA's Turing generation. The benchmark data reveals a clear split: the NVIDIA card wins 7 out of 10 head-to-head tests, yet the AMD card holds its own in specific workloads, making the choice highly dependent on the intended use case.

Where Each One Wins

The data paints a picture of two specialized tools. The NVIDIA Quadro RTX 4000 dominates in raw compute and modern API performance, while the AMD Radeon RX 6600 shows strength in legacy DirectX 11 titles and 2D workloads. Looking at the head-to-head results, the Quadro RTX 4000 secures wins in 3DMark Steel Nomad DX12, Geekbench OpenCL, Geekbench Vulkan, Passmark DirectX 10, DirectX 12, DirectX 9, and Passmark G3D. Its most commanding victory is in Geekbench OpenCL, where it leads by a massive 61.3% over the RX 6600. This suggests the Quadro is the superior choice for compute-heavy professional applications that leverage OpenCL, such as scientific simulation or video rendering.

Conversely, the AMD Radeon RX 6600 wins in Passmark DirectX 11, Passmark G2D, and Passmark GPU Compute. Its 18.8% lead in DirectX 11 is particularly notable, as it indicates better performance for older games and applications that haven't migrated to newer APIs. The G2D win, albeit by a slim 5.1% margin, points to superior 2D desktop rendering and perhaps faster UI interactions. The GPU Compute victory, with a 6.1% delta, shows the RX 6600 can outperform the Quadro in certain general-purpose compute tasks, despite the Quadro's overwhelming OpenCL advantage.

Architecture Differences

The architectural gap between these two cards is substantial and explains the benchmark divergence. The RX 6600 uses the Navi 23 chip on TSMC's 7 nm process, packing 11,060 million transistors into a 237 mm² die. This results in a transistor density of 46.7M per mm², a signal of modern manufacturing efficiency. In contrast, the Quadro RTX 4000 uses the TU104 chip on a 12 nm process, with 13,600 million transistors spread across a much larger 545 mm² die, yielding a lower density of 25.0M per mm². The AMD card's smaller, denser design contributes to its lower TDP of 132 W versus the Quadro's 160 W.

Memory architecture also differs significantly. Both cards have 8 GB of GDDR6, but the Quadro RTX 4000 utilizes a 256-bit bus width, delivering 416.0 GB/s of bandwidth, nearly double the RX 6600's 224.0 GB/s from a 128-bit bus. This bandwidth advantage is critical for professional workloads that move large datasets. The RX 6600 compensates with much higher clock speeds: a base of 1626 MHz and boost of 2491 MHz, compared to the Quadro's 1005 MHz base and 1545 MHz boost. The AMD card's game clock sits at 2044 MHz, a figure the NVIDIA card has no direct equivalent for.

Feature sets diverge as well. The Quadro RTX 4000 includes 288 tensor cores, a feature entirely absent from the RX 6600, making it better suited for AI and machine learning tasks. The RX 6600 counters with 28 ray tracing cores, fewer than the Quadro's 36, but both support DirectX 12 Ultimate. The bus interface differs, with the RX 6600 using PCIe 4.0 x8 while the Quadro uses PCIe 3.0 x16, a difference that may affect data transfer in bandwidth-sensitive scenarios.

Head-to-Head Benchmarks

The most dramatic disparity appears in Geekbench OpenCL, where the Quadro RTX 4000 scores 74540 against the RX 6600's 28850, a 61.3% advantage. This result alone suggests the Quadro's 2304 shading units and higher bandwidth are far more effective for OpenCL compute. The 3DMark Steel Nomad DX12 test also favors NVIDIA, with the Quadro scoring 1873 versus 1492, a 20.3% lead, indicating better raw DX12 gaming performance despite the AMD card's higher clocks.

Geekbench Vulkan shows a closer contest, with the Quadro at 78844 and the RX 6600 at 67623, a 14.2% difference. This suggests that while AMD's RDNA 2.0 architecture is competitive, the Quadro's additional shading units (2304 vs 1792) and tensor cores provide an edge. In Passmark's DirectX 10 test, the Quadro leads 108 to 95, a 12% margin, and in DirectX 9 it wins 205 to 197, a smaller 3.9% gap. The DirectX 12 test is nearly a tie, with the Quadro at 52 and the RX 6600 at 51.

The AMD card's standout win is in Passmark DirectX 11, scoring 152 against the Quadro's 128, an 18.8% improvement. This is a significant victory for legacy API support. In Passmark G2D, the RX 6600 scores 889 versus 846, a 5.1% win. The GPU Compute test also goes to AMD, 6554 to 6176, a 6.1% margin. Interestingly, the Passmark G3D scores are virtually identical, with the Quadro at 15117 and the RX 6600 at 15096, a 0.1% difference, showing parity in overall 3D performance.

FAQ

Q: Which card is faster in modern DirectX 12 workloads?

A: The NVIDIA Quadro RTX 4000 wins in 3DMark Steel Nomad DX12, scoring 1873 versus the RX 6600's 1492, a 20.3% advantage. However, in Passmark DirectX 12, the difference is negligible, with scores of 52 and 51 respectively.

Q: How do the two cards compare in compute-heavy tasks?

A: The Quadro RTX 4000 dominates Geekbench OpenCL with a 61.3% lead, scoring 74540 versus 28850. Yet, the RX 6600 wins Passmark GPU Compute, 6554 to 6176, a 6.1% margin, showing the results depend heavily on the specific compute API and test.

Q: Does the AMD card have better legacy API support?

A: Yes, the RX 6600 wins Passmark DirectX 11 by 18.8%, scoring 152 against the Quadro's 128. It also wins Passmark G2D, but the Quadro leads in DirectX 9 and DirectX 10 by 3.9% and 12% respectively.

Q: What is the difference in memory bandwidth?

A: The Quadro RTX 4000 has a 256-bit bus and 416.0 GB/s bandwidth, while the RX 6600 uses a 128-bit bus with 224.0 GB/s. This gives the Quadro nearly double the memory bandwidth.

Q: Which card has more shading units?

A: The NVIDIA Quadro RTX 4000 has 2304 shading units, while the AMD Radeon RX 6600 has 1792. The Quadro also has 288 tensor cores, which the RX 6600 lacks entirely.

Q: Are there any benchmark results where the cards are essentially tied?

A: Yes, in Passmark G3D, the Quadro scores 15117 and the RX 6600 scores 15096, a 0.1% difference. Similarly, Passmark DirectX 12 shows a 1.9% gap, with scores of 52 and 51.

The Verdict

The data indicates a clear choice for different user profiles. The NVIDIA Quadro RTX 4000 is the superior card for professional and compute-oriented workloads, evidenced by its 61.3% OpenCL lead and 20.3% DX12 advantage. Its 416.0 GB/s bandwidth and 288 tensor cores make it the better tool for machine learning, scientific compute, and modern API gaming. The card's higher average benchmark score of 17789 and 61st percentile rank, while lower than the RX 6600's 19036 average and 63rd percentile, are offset by its specific strengths.

The AMD Radeon RX 6600 is the better pick for users prioritizing legacy DirectX 11 performance, where it leads by 18.8%, and for general 2D tasks, where its 5.1% G2D edge provides a snappier desktop experience. Its higher clocks and 7 nm efficiency translate to a lower TDP of 132 W, making it more power-efficient. The RX 6600's 6.1% GPU Compute win also suggests it handles certain compute tasks better, despite losing the OpenCL battle. For budget-conscious gamers focused on older titles, the RX 6600's strengths are compelling, but the Quadro's overall win count of 7 out of 10 tests makes it the more versatile performer.

Specification Differences

The two cards differ across nearly every major specification. The RX 6600 uses a 7 nm process with 11,060 million transistors on a 237 mm² die, while the Quadro RTX 4000 uses a 12 nm process with 13,600 million transistors on a 545 mm² die. Clock speeds favor AMD, with the RX 6600's base at 1626 MHz and boost at 2491 MHz, versus the Quadro's 1005 MHz base and 1545 MHz boost. The RX 6600's game clock is 2044 MHz, a figure the Quadro does not have.

Memory configuration differs, with both having 8 GB of GDDR6, but the Quadro uses a 256-bit bus for 416.0 GB/s, while the RX 6600 uses a 128-bit bus for 224.0 GB/s. The Quadro has more shading units (2304 vs 1792), more TMUs (144 vs 112), and more RT cores (36 vs 28), plus 288 tensor cores that the RX 6600 lacks. Both have 64 ROPs. Pixel rate favors AMD at 159.4 GPixel/s versus 98.88 GPixel/s, as does texture rate at 279.0 GTexel/s versus 222.5 GTexel/s. FP32 performance is higher on AMD at 8.928 TFLOPS versus 7.119 TFLOPS.

Power and physical specs also diverge: TDP is 132 W for AMD versus 160 W for NVIDIA, with the RX 6600 being a dual-slot card and the Quadro single-slot. The RX 6600 uses PCIe 4.0 x8, while the Quadro uses PCIe 3.0 x16. Display outputs differ, with AMD offering 1x HDMI 2.1 and 3x DisplayPort 1.4a, while NVIDIA offers 3x DisplayPort 1.4a and 1x USB Type-C. The RX 6600 is 190 mm long, 110 mm high, and 40 mm wide, while the Quadro is 241 mm long and 111 mm high, with no width listed.