AMD Radeon RX 6600 LE vs NVIDIA RTX 4000 SFF Ada Generation Comparison

Head-to-Head Benchmarks

The recorded data leaves no ambiguity: the NVIDIA RTX 4000 SFF Ada Generation outperforms the AMD Radeon RX 6600 LE in both benchmark tests in the database. In the Geekbench OpenCL test, the NVIDIA card scores 124,812 against 69,229 for the AMD card, a delta of 80.3% in favor of the RTX 4000 SFF. That is a decisive margin, nearly doubling the AMD card's score in this compute-oriented workload. The Geekbench Vulkan test shows a closer but still substantial gap: 109,364 for the NVIDIA card versus 72,428 for the AMD card, a 51% difference.

The NVIDIA card's average benchmark score of 117,088 places it in the 95th percentile of all GPUs in the database. The AMD card's average of 70,829 sits in the 91st percentile. While both are high-ranking parts, the RTX 4000 SFF sits in a different tier entirely: it lands within 0.3% of the NVIDIA GB10, within 1.6% of the AMD Radeon PRO W7700, and ahead of the Tesla V100 SXM2 16 GB by 2.4% and the RTX A5500 Mobile by 2.8%. The RX 6600 LE, by contrast, is effectively tied with the RTX A3000 Mobile (1% ahead), 1.2% ahead of the Quadro P6000, 1.3% behind the RX 6650M, and 1.4% ahead of the Radeon Pro WX 8200.

The head-to-head deltas are consistent across both API tests. The OpenCL gap of 80.3% is larger than the Vulkan gap of 51%, suggesting the NVIDIA architecture has a particular advantage in OpenCL compute workloads. The Vulkan result, while still a clear NVIDIA win, indicates that the AMD card is relatively more competitive in graphics-oriented API paths. Yet even there, the RTX 4000 SFF holds a commanding 51% lead, which is not a marginal edge but a generational chasm in measured performance.

Architecture Differences

These two cards come from fundamentally different design philosophies. The NVIDIA RTX 4000 SFF Ada Generation uses the AD104 chip built on TSMC's 5 nm process, containing 35,800 million transistors on a 294 mm² die. That yields a transistor density of 121.8 million per mm². The AMD Radeon RX 6600 LE uses the Navi 23 chip on a 7 nm process, with 11,060 million transistors on a 237 mm² die, for a density of 46.7 million per mm². The NVIDIA chip packs over three times the transistors into only about 24% more die area.

The memory configurations diverge sharply. The RTX 4000 SFF carries 20 GB of GDDR6 on a 160-bit bus, delivering 280.0 GB/s of bandwidth. The RX 6600 LE has 8 GB of GDDR6 on a 128-bit bus, providing 224.0 GB/s. The NVIDIA card offers 2.5 times the capacity and 25% more bandwidth. Clock speeds tell a different story: the AMD card runs at a 1626 MHz base and 2495 MHz boost, with a 2045 MHz game clock, while the NVIDIA card runs at a modest 720 MHz base and 1560 MHz boost. Both use 1750 MHz memory clocks with 14 Gbps effective data rates.

Compute resources are where the architectures truly separate. The RTX 4000 SFF has 6144 shading units, 192 texture mapping units, 64 ROPs, 48 ray tracing cores, and 192 tensor cores. The RX 6600 LE has 1792 shading units, 112 TMUs, 64 ROPs, and 28 ray tracing cores, with no tensor cores listed. The NVIDIA card's FP32 throughput is 19.17 TFLOPS, more than double the AMD card's 8.942 TFLOPS. In FP16, the NVIDIA card maintains 19.17 TFLOPS at a 1:1 ratio, while the AMD card achieves 17.88 TFLOPS at a 2:1 ratio. The pixel rate favors AMD at 159.7 GPixel/s versus 99.84 GPixel/s, but the texture rate is nearly identical: 299.5 GTexel/s for NVIDIA versus 279.4 GTexel/s for AMD.

Power and physical design also differ. The RTX 4000 SFF has a 70 W TDP, requires no power connectors, and is a dual-slot card measuring 168 mm long and 69 mm high. The RX 6600 LE has a 132 W TDP, requires a single 8-pin connector, and is a dual-slot card measuring 190 mm long, 110 mm high, and 40 mm wide. The suggested PSU is 250 W for the NVIDIA card and 300 W for the AMD card. Both use PCIe 4.0, but the NVIDIA card uses x16 while the AMD card uses x8. Display outputs differ too: the NVIDIA card has 4x mini-DisplayPort 1.4a, while the AMD card has 1x HDMI 2.1 and 3x DisplayPort 1.4a.

Where Each One Wins

The RTX 4000 SFF wins outright in raw compute performance. Its FP32 throughput of 19.17 TFLOPS versus 8.942 TFLOPS means it handles general-purpose compute workloads with more than double the theoretical peak. The OpenCL benchmark confirms this in practice, with the 80.3% lead suggesting real-world compute applications scale even better than the theoretical ratio. The 20 GB memory capacity is a decisive advantage for large datasets, model weights, or high-resolution textures that would exceed the 8 GB limit on the RX 6600 LE. The NVIDIA card also has tensor cores, which the AMD card lacks entirely, making the RTX 4000 SFF the only option for tensor-accelerated workloads in this comparison.

The RX 6600 LE has one clear advantage in the measured data: pixel fill rate. Its 159.7 GPixel/s versus 99.84 GPixel/s represents a 60% higher pixel throughput. This benefits traditional rasterization at high resolutions where pixel shading dominates. The AMD card also runs at much higher clock speeds (2495 MHz boost versus 1560 MHz boost), which can help in latency-sensitive scenarios. Its smaller 237 mm² die and 7 nm process mean it is a leaner, simpler design, though the database does not record any efficiency metrics beyond TDP. The RX 6600 LE's 91st percentile ranking shows it is still a strong performer, but its nearest rivals are all mobile or older workstation parts, placing it in a lower performance class.

For workload selection, the data suggests the RTX 4000 SFF for compute-heavy tasks, large memory footprints, and any use of tensor cores. The RX 6600 LE is better suited for pure rasterization workloads where pixel rate matters and where the 8 GB memory is sufficient. The NVIDIA card's 51% Vulkan lead indicates it also wins in modern graphics APIs, so the AMD card's pixel rate advantage does not translate into a benchmark victory.

FAQ

Q: Which card has a higher average benchmark score?

A: The NVIDIA RTX 4000 SFF Ada Generation has an average benchmark score of 117,088, compared to 70,829 for the AMD Radeon RX 6600 LE. The NVIDIA card sits in the 95th percentile of all GPUs, while the AMD card sits in the 91st percentile.

Q: How large is the performance gap in the Geekbench Vulkan test?

A: The NVIDIA card scores 109,364 versus 72,428 for the AMD card, a 51% delta in favor of the RTX 4000 SFF Ada Generation.

Q: What is the memory capacity difference?

A: The NVIDIA card has 20 GB of GDDR6 memory, while the AMD card has 8 GB of GDDR6. The NVIDIA card also has a wider 160-bit bus versus 128-bit, providing 280.0 GB/s bandwidth versus 224.0 GB/s.

Q: Does the AMD card have tensor cores?

A: No. The AMD Radeon RX 6600 LE has no tensor cores listed in the database. The NVIDIA RTX 4000 SFF has 192 tensor cores.

Q: Which card has a higher FP32 throughput?

A: The NVIDIA card has 19.17 TFLOPS FP32, more than double the AMD card's 8.942 TFLOPS.

Q: What are the TDP requirements?

A: The NVIDIA card has a 70 W TDP with no power connectors and a 250 W suggested PSU. The AMD card has a 132 W TDP with one 8-pin connector and a 300 W suggested PSU.

The Verdict

The data points to a clear conclusion: the NVIDIA RTX 4000 SFF Ada Generation is the superior performer in every recorded benchmark. It wins both head-to-head tests, holds a higher average score, ranks in a higher percentile, and offers more than double the FP32 compute throughput. The 20 GB memory capacity versus 8 GB is a decisive differentiator for any workload that approaches the 8 GB ceiling. The presence of 192 tensor cores versus none on the AMD card further widens the functional gap.

The AMD Radeon RX 6600 LE is not without merit. Its 91st percentile ranking shows it outperforms the vast majority of GPUs in the database. Its pixel rate of 159.7 GPixel/s exceeds the NVIDIA card's 99.84 GPixel/s, and its higher clock speeds (2495 MHz boost versus 1560 MHz) suggest it can be responsive in certain scenarios. But in the recorded benchmark data, none of these advantages translate into a win. The AMD card's nearest rivals are the RTX A3000 Mobile, Quadro P6000, RX 6650M, and Radeon Pro WX 8200, all of which are within 1.4% of its score. The NVIDIA card's rivals are the GB10, PRO W7700, Tesla V100, and RTX A5500 Mobile, all of which are within 2.8% of its score. These are different performance tiers.

For a user choosing between these two, the decision hinges on what the database shows. If the workload involves large datasets, tensor operations, or compute-intensive tasks, the RTX 4000 SFF is the only rational choice. If the workload is purely rasterization with modest memory needs and the pixel rate advantage matters, the RX 6600 LE could be considered. But the 51% to 80.3% benchmark deltas are too large to ignore. The RTX 4000 SFF is the faster card by every measured metric.

Specification Differences

| Specification | NVIDIA RTX 4000 SFF Ada Generation | AMD Radeon RX 6600 LE |

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

| Architecture | Ada Lovelace | RDNA 2.0 |

| Process Node | 5 nm | 7 nm |

| Transistors | 35,800 million | 11,060 million |

| Die Size | 294 mm² | 237 mm² |

| Transistor Density | 121.8M / mm² | 46.7M / mm² |

| Base Clock | 720 MHz | 1626 MHz |

| Boost Clock | 1560 MHz | 2495 MHz |

| Game Clock | N/A | 2045 MHz |

| Memory Size | 20 GB | 8 GB |

| Memory Bus | 160 bit | 128 bit |

| Memory Bandwidth | 280.0 GB/s | 224.0 GB/s |

| Shading Units | 6144 | 1792 |

| TMUs | 192 | 112 |

| ROPs | 64 | 64 |

| RT Cores | 48 | 28 |

| Tensor Cores | 192 | N/A |

| Pixel Rate | 99.84 GPixel/s | 159.7 GPixel/s |

| Texture Rate | 299.5 GTexel/s | 279.4 GTexel/s |

| FP32 | 19.17 TFLOPS | 8.942 TFLOPS |

| FP16 | 19.17 TFLOPS (1:1) | 17.88 TFLOPS (2:1) |

| TDP | 70 W | 132 W |

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

| Suggested PSU | 250 W | 300 W |

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

| Display Outputs | 4x mini-DisplayPort 1.4a | 1x HDMI 2.1, 3x DisplayPort 1.4a |

| Length | 168 mm | 190 mm |

| Height | 69 mm | 110 mm |

| Width | N/A | 40 mm |

| Release Date | 2023-03-20 | 2023-12-07 |