AMD Radeon RX 6600 XT vs NVIDIA GeForce GTX 780 Ti Comparison

The AMD Radeon RX 6600 XT and NVIDIA GeForce GTX 780 Ti represent two distinct eras of GPU design, separated by nearly eight years of architectural evolution. The benchmark data shows a decisive overall victory for the AMD card, which wins all three head-to-head comparisons by substantial margins. However, the GTX 780 Ti retains a niche in legacy API workloads, and the specification sheet reveals a fascinating contrast in how each company approached GPU construction during their respective generations.

Head-to-Head Benchmarks

The most lopsided result appears in the Geekbench Metal test, where the RX 6600 XT scores 88,720 points against the GTX 780 Ti's 18,144 points. This represents a 389% advantage for the AMD card, the largest delta in any comparison. The Metal API is Apple's graphics framework, and the RX 6600 XT's modern RDNA 2.0 architecture is clearly far better optimized for it than the Kepler-based GTX 780 Ti.

The OpenCL benchmark tells a similar story, though with a smaller margin. The RX 6600 XT posts 80,503 points versus 27,326 for the GTX 780 Ti, a 194.6% difference. OpenCL is a cross-platform compute API, and the data suggests the AMD card's 10.60 TFLOPS FP32 throughput simply overwhelms the older card's 5.345 TFLOPS. The compute advantage is consistent with the architectural gap between a 7nm chip and a 28nm chip.

Vulkan results narrow the gap further but still favor AMD decisively. The RX 6600 XT scores 72,417 points compared to 27,238 for the GTX 780 Ti, a 165.9% delta. Vulkan is a low-overhead API that can sometimes favor older architectures, but here the modern RDNA 2.0 implementation with Vulkan 1.4 support proves far superior to the GTX 780 Ti's Vulkan 1.2.175 support. The RX 6600 XT wins all three head-to-head tests, giving it a clean 3-0 record in the winsA/winsB tally.

Architecture Differences

The process node difference is stark: the RX 6600 XT uses a 7nm process from TSMC, while the GTX 780 Ti uses a 28nm process from the same foundry. This translates directly into transistor density. The AMD chip packs 11,060 million transistors into a 237 mm² die, yielding a density of 46.7 million transistors per square millimeter. The NVIDIA chip contains 7,080 million transistors spread across a much larger 561 mm² die, resulting in just 12.6 million transistors per square millimeter.

The core configurations reflect different design philosophies. The RX 6600 XT has 2,048 shading units, 128 texture mapping units, and 64 raster operation pipelines. The GTX 780 Ti counters with 2,880 shading units, 240 TMUs, but only 48 ROPs. Despite having fewer shaders and TMUs, the AMD card achieves higher pixel and texture rates: 165.7 GPixel/s and 331.4 GTexel/s, respectively, versus 55.68 GPixel/s and 222.7 GTexel/s for the NVIDIA card. This is a direct result of the much higher clock speeds on the RX 6600 XT, which boosts to 2589 MHz compared to the GTX 780 Ti's 928 MHz boost.

Memory subsystems also differ fundamentally. The RX 6600 XT uses 8 GB of GDDR6 memory on a 128-bit bus, delivering 256.0 GB/s bandwidth. The GTX 780 Ti uses 3 GB of GDDR5 on a 384-bit bus, providing 336.6 GB/s bandwidth. The older card actually has higher raw bandwidth, but the modern card has more capacity and faster effective memory speed (16 Gbps versus 7 Gbps). The RX 6600 XT also supports PCIe 4.0 x8, while the GTX 780 Ti uses PCIe 3.0 x16.

Feature support marks the clearest generational divide. The RX 6600 XT includes 32 ray tracing cores and supports DirectX 12 Ultimate (12_2), while the GTX 780 Ti has no ray tracing hardware and only supports DirectX 12 (11_1). The AMD card also supports Vulkan 1.4 versus 1.2.175 on the NVIDIA card. Both support OpenGL 4.6. The RX 6600 XT draws 160 W TDP with a single 8-pin connector, while the GTX 780 Ti draws 250 W TDP and requires both a 6-pin and an 8-pin connector.

Where Each One Wins

The RX 6600 XT wins across every modern benchmark category represented in the data. Its Geekbench Metal, OpenCL, and Vulkan scores all exceed the GTX 780 Ti's by at least 165%. The AMD card's advantage is most pronounced in Metal, where it is nearly five times faster. This makes it the clear choice for any workload using contemporary graphics APIs or compute frameworks.

The GTX 780 Ti shows no benchmark wins in the provided data, but its specification sheet hints at areas where it might hold its own. Its 384-bit memory bus provides higher raw bandwidth (336.6 GB/s versus 256.0 GB/s), which could benefit certain bandwidth-sensitive workloads. Its higher shading unit count (2,880 versus 2,048) and TMU count (240 versus 128) suggest it might perform competitively in pure rasterization tasks that are not API-constrained, though the data does not include such tests to confirm this.

For legacy DirectX 9 or DirectX 10 workloads, the GTX 780 Ti's Kepler architecture might have strengths, but the RX 6600 XT's PassMark scores in these categories (194 for DX9, 109 for DX10) are the only data points available, and no comparable GTX 780 Ti scores exist in the pack. The overall average benchmark scores are nearly identical: 24,442 for the RX 6600 XT and 24,236 for the GTX 780 Ti, a difference of only 0.8%. This near-parity in average score, despite the huge head-to-head deltas, suggests the two cards are closely matched in some unshown workloads.

The Verdict

The data directs a clear recommendation: the AMD Radeon RX 6600 XT is the superior card for any modern workload. It wins all three head-to-head benchmarks with margins ranging from 165.9% to 389%. Its 8 GB of GDDR6 memory doubles the GTX 780 Ti's 3 GB capacity, and its ray tracing cores plus DirectX 12 Ultimate support make it future-proof in ways the Kepler card cannot match. The RX 6600 XT also achieves this with lower power draw (160 W versus 250 W) and a smaller physical footprint (190 mm length versus 267 mm).

The NVIDIA GeForce GTX 780 Ti is not competitive in the tested metrics. Its 3 GB memory capacity is a hard limitation for modern games, and its lack of ray tracing hardware excludes it from DirectX 12 Ultimate features. The card's only theoretical advantages are higher memory bandwidth (336.6 GB/s) and more shading units (2,880), but these do not translate into wins in any benchmark provided. Its 250 W TDP and requirement for two power connectors make it less efficient than the AMD card.

For buyers choosing between these two, the RX 6600 XT is the only rational pick based on the data. It wins every direct comparison, offers more memory, supports newer APIs, and consumes less power. The GTX 780 Ti is a historical artifact that cannot keep pace in any measured metric. The 0.8% delta in average benchmark scores between the two (24,442 versus 24,236) is misleading; the head-to-head results show the AMD card is categorically faster in every tested scenario.

FAQ

Q: Which card has better Metal performance?

A: The AMD Radeon RX 6600 XT scores 88,720 points in Geekbench Metal, which is 389% higher than the NVIDIA GeForce GTX 780 Ti's 18,144 points.

Q: What is the memory capacity difference between the two cards?

A: The RX 6600 XT has 8 GB of GDDR6 memory, while the GTX 780 Ti has 3 GB of GDDR5 memory. The AMD card also has faster effective memory speed at 16 Gbps versus 7 Gbps.

Q: Does the GTX 780 Ti support ray tracing?

A: No. The GTX 780 Ti has no ray tracing cores, while the RX 6600 XT includes 32 ray tracing cores and supports DirectX 12 Ultimate (12_2).

Q: How do the cards compare in power consumption?

A: The RX 6600 XT has a TDP of 160 W and requires a single 8-pin power connector, while the GTX 780 Ti has a TDP of 250 W and requires both a 6-pin and an 8-pin connector.

Q: What is the average benchmark score for each card?

A: The RX 6600 XT has an average benchmark score of 24,442, while the GTX 780 Ti has an average of 24,236. This is a 0.8% difference, favoring the AMD card.

Q: Which card has a higher transistor density?

A: The RX 6600 XT has a transistor density of 46.7 million per square millimeter, compared to the GTX 780 Ti's 12.6 million per square millimeter. This is due to the AMD card's 7nm process versus the NVIDIA card's 28nm process.

Specification Differences

| Specification | AMD Radeon RX 6600 XT | NVIDIA GeForce GTX 780 Ti |

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

| Architecture | RDNA 2.0 | Kepler |

| Process Node | 7 nm | 28 nm |

| Transistors | 11,060 million | 7,080 million |

| Die Size | 237 mm² | 561 mm² |

| Transistor Density | 46.7M / mm² | 12.6M / mm² |

| Base Clock | 1968 MHz | 875 MHz |

| Boost Clock | 2589 MHz | 928 MHz |

| Memory Size | 8 GB | 3 GB |

| Memory Type | GDDR6 | GDDR5 |

| Memory Bus | 128 bit | 384 bit |

| Memory Bandwidth | 256.0 GB/s | 336.6 GB/s |

| Shading Units | 2048 | 2880 |

| TMUs | 128 | 240 |

| ROPs | 64 | 48 |

| RT Cores | 32 | None |

| Pixel Rate | 165.7 GPixel/s | 55.68 GPixel/s |

| Texture Rate | 331.4 GTexel/s | 222.7 GTexel/s |

| FP32 | 10.60 TFLOPS | 5.345 TFLOPS |

| TDP | 160 W | 250 W |

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

| Suggested PSU | 450 W | 600 W |

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

| DirectX | 12 Ultimate (12_2) | 12 (11_1) |

| Vulkan | 1.4 | 1.2.175 |

| Length | 190 mm | 267 mm |

| Height | 110 mm | 111 mm |

| Width | 40 mm | 38 mm |