AMD Radeon RX 6800 XT vs NVIDIA GeForce RTX 4080 Comparison

The NVIDIA GeForce RTX 4080 and AMD Radeon RX 6800 XT represent two distinct generations of flagship-class graphics hardware, and the benchmark data shows a decisive performance gap between them. Across ten head-to-head tests, the RTX 4080 wins every single matchup, with the average benchmark score of 54,247 placing it 11.9% above the RX 6800 XT’s 48,477. The gap is not uniform, however, ranging from a modest 18.9% lead in one legacy DirectX test to a massive 92.7% advantage in a Vulkan compute workload. This analysis walks through the specific benchmark results, architectural differences, and the practical implications for each card’s target user.

Head-to-Head Benchmarks

The most dramatic separation occurs in the 3DMark Steel Nomad DX12 test, where the RTX 4080 scores 6,567 against the RX 6800 XT’s 3,689, a 78% advantage. This is the single largest delta in the suite and reflects the RTX 4080’s ability to sustain far higher throughput in modern, graphics-heavy workloads. The Vulkan benchmark tells a similar story, with the RTX 4080 posting 263,779 versus 136,875 for the AMD card, a 92.7% gap — the widest margin recorded in any test. These two results alone suggest that the RTX 4080 is in a different performance tier for contemporary APIs.

Compute-heavy tests also favor the NVIDIA card substantially. In Geekbench OpenCL, the RTX 4080 scores 214,739 against 171,304, a 25.4% lead. The Passmark GPU Compute test shows an even larger 56.1% advantage, with scores of 20,671 versus 13,245. These figures indicate that the RTX 4080’s shader and tensor hardware deliver significantly more raw compute throughput, which matters for rendering, physics simulation, and non-gaming workloads like machine learning inference.

The Passmark suite reveals a consistent pattern across different DirectX versions. In DirectX 9, the RTX 4080 leads by 39.6% (370 vs. 265); in DirectX 10, the lead is 31.6% (204 vs. 155); and in DirectX 11, it narrows to 18.9% (314 vs. 264). The DirectX 12 test shows a 32% advantage (132 vs. 100), though the absolute scores here are low, indicating this particular test may not fully stress either card. The 2D graphics test, Passmark G2D, shows the smallest relative gap at 20.3% (1,239 vs. 1,030), which is still a clear win for the RTX 4080.

The 3DMark and Passmark G3D results round out the picture. Passmark G3D gives the RTX 4080 a 37.9% win (34,457 vs. 24,980), while the 3DMark Steel Nomad result at 78% underscores that the NVIDIA card excels in the most demanding scenarios. Notably, the RX 6800 XT does not win a single test, and its best relative performance comes in DirectX 11, where the gap is smallest. This suggests that while the AMD card remains competitive in older DirectX titles, it falls progressively further behind as workloads become more modern and compute-intensive.

Architecture Differences

The two cards are built on fundamentally different architectures and process nodes. The RTX 4080 uses the AD103 chip on TSMC’s 5 nm process, packing 45,900 million transistors into a 379 mm² die, yielding a transistor density of 121.1 million per mm². The RX 6800 XT, in contrast, uses the Navi 21 chip on TSMC’s 7 nm process, with 26,800 million transistors on a much larger 520 mm² die, giving a density of just 51.5 million per mm². The RTX 4080’s newer node allows it to fit 71% more transistors in a 27% smaller area, which is a primary driver of its performance advantage.

The compute configuration differs dramatically. The RTX 4080 has 9,728 shading units, 304 texture mapping units, and 112 ROPs, while the RX 6800 XT has 4,608 shading units, 288 TMUs, and 128 ROPs. The NVIDIA card has over twice the shader count, though its ROP count is slightly lower. This translates to a large gap in raw throughput: the RTX 4080 achieves 48.74 TFLOPS FP32 versus 20.74 TFLOPS for the AMD card, a 135% difference. The RTX 4080 also has 304 tensor cores, which the RX 6800 XT lacks entirely, making NVIDIA’s card far more capable for AI-accelerated tasks.

Memory subsystems also diverge. Both cards feature 16 GB of VRAM on a 256-bit bus, but the RTX 4080 uses GDDR6X at 22.4 Gbps effective, yielding 716.8 GB/s of bandwidth, while the RX 6800 XT uses GDDR6 at 16 Gbps effective for 512.0 GB/s. The 40% bandwidth advantage for the NVIDIA card is significant in high-resolution textures and ray tracing workloads. Clock speeds are also higher on the RTX 4080, with a 2205 MHz base and 2505 MHz boost, compared to 1825 MHz base and 2250 MHz boost for the AMD card (the RX 6800 XT has a listed game clock of 2015 MHz, which the RTX 4080 does not specify).

Ray tracing hardware differs as well. The RTX 4080 has 76 RT cores, while the RX 6800 XT has 72, and the NVIDIA implementation is based on Ada Lovelace’s third-generation RT cores, which typically offer better ray tracing efficiency per core. Power consumption is close, with the RTX 4080 rated at 320 W and the RX 6800 XT at 300 W, both requiring a 700 W power supply. However, the RTX 4080 uses a single 16-pin connector, while the AMD card uses two 8-pin connectors. Physical dimensions also differ, with the RTX 4080 being triple-slot and 310 mm long, versus the RX 6800 XT’s dual-slot 267 mm length.

FAQ

Q: Which card has a higher average benchmark score?

A: The NVIDIA GeForce RTX 4080 has an average benchmark score of 54,247, which is 11.9% higher than the AMD Radeon RX 6800 XT’s 48,477.

Q: What is the largest performance gap between the two cards in any single test?

A: The largest gap is in the Geekbench Vulkan test, where the RTX 4080 scores 263,779 versus 136,875, a 92.7% advantage.

Q: Does the RX 6800 XT win any benchmark in the head-to-head comparisons?

A: No, the RX 6800 XT loses all ten head-to-head benchmarks. Its closest result is in Passmark DirectX 11, where it trails by 18.9%.

Q: How do the memory bandwidth figures compare?

A: The RTX 4080 has 716.8 GB/s of bandwidth from GDDR6X memory, while the RX 6800 XT has 512.0 GB/s from GDDR6, a 40% difference.

Q: What is the transistor density difference between the two GPUs?

A: The RTX 4080 has a transistor density of 121.1 million per mm² on a 5 nm process, while the RX 6800 XT has 51.5 million per mm² on a 7 nm process.

Q: Which card has more shading units?

A: The RTX 4080 has 9,728 shading units, which is more than double the RX 6800 XT’s 4,608 shading units.

Specification Differences

The two cards differ in nearly every major specification category. The RTX 4080 uses the AD103 chip on a 5 nm process, while the RX 6800 XT uses Navi 21 on 7 nm. Transistor counts are 45,900 million versus 26,800 million, and die sizes are 379 mm² versus 520 mm². The RTX 4080 has a base clock of 2205 MHz and boost clock of 2505 MHz, while the RX 6800 XT has a base clock of 1825 MHz and boost clock of 2250 MHz, plus a game clock of 2015 MHz. Memory type differs (GDDR6X vs. GDDR6), with effective speeds of 22.4 Gbps versus 16 Gbps, leading to bandwidth of 716.8 GB/s versus 512.0 GB/s. The RTX 4080 has 9,728 shading units, 304 TMUs, and 112 ROPs; the RX 6800 XT has 4,608 shading units, 288 TMUs, and 128 ROPs. RT core counts are 76 versus 72, and the RTX 4080 has 304 tensor cores while the RX 6800 XT has none. FP32 performance is 48.74 TFLOPS versus 20.74 TFLOPS, and FP16 performance is 48.74 TFLOPS (1:1) versus 41.47 TFLOPS (2:1). TDP is 320 W versus 300 W, slot width is triple-slot versus dual-slot, and power connectors are 1x 16-pin versus 2x 8-pin. Dimensions are 310 mm x 140 mm x 61 mm versus 267 mm x 120 mm x 50 mm. The RTX 4080 has 1x HDMI 2.1 and 3x DisplayPort 1.4a outputs, while the RX 6800 XT has 1x HDMI 2.1, 2x DisplayPort 1.4a, and 1x USB Type-C. The launch MSRP for the RTX 4080 is 1,199 USD, and for the RX 6800 XT it is 649 USD.

The Verdict

The data is unambiguous: the RTX 4080 outperforms the RX 6800 XT in every single benchmark tested. Across ten tests, the NVIDIA card wins with deltas ranging from 18.9% to 92.7%, and its average score is 11.9% higher. The RTX 4080’s advantages stem from a newer 5 nm process, a 135% higher FP32 throughput, 40% more memory bandwidth, and the presence of tensor cores that the AMD card lacks. The RX 6800 XT’s only statistical consolation is that it remains within 20% of the RTX 4080 in legacy DirectX 11 and 2D workloads, but it falls behind by 56% or more in compute and modern API tests.

From a pure performance standpoint, the RTX 4080 is the clear choice for users who prioritize maximum frame rates, especially in DX12 and Vulkan titles, or who need compute horsepower for non-gaming tasks. The RX 6800 XT, while end-of-life and older, still offers 16 GB of VRAM and 20.74 TFLOPS of FP32 performance, which may suffice for 1440p gaming in less demanding titles. However, the benchmark results show that the RTX 4080 is not just faster — it is in a different class for modern workloads, with a 78% lead in 3DMark Steel Nomad and a 92.7% lead in Vulkan. Users should note that both cards are end-of-life, so the choice is between an older, slower product and a newer, faster one, with the RTX 4080’s higher launch MSRP reflecting its superior capabilities.

Where Each One Wins

The RTX 4080 wins in every category that matters for gaming and compute. In 3DMark Steel Nomad DX12, it leads by 78%, indicating a massive advantage in modern game engines that leverage DX12’s low-level features. In Geekbench Vulkan, the 92.7% gap suggests the RTX 4080 is exceptionally strong for Vulkan-based games and applications, which are common in Linux gaming and emulation. The Passmark GPU Compute test shows a 56.1% lead, making the RTX 4080 the clear choice for GPGPU workloads like video encoding, scientific simulation, or machine learning inference, where its tensor cores provide an additional edge.

The RX 6800 XT’s closest relative performance comes in Passmark DirectX 11, where it trails by only 18.9%. This indicates that for older DirectX 11 games, the gap narrows, and the AMD card may still provide playable performance at lower settings. Similarly, the 20.3% gap in Passmark G2D suggests that 2D desktop workloads are the least differentiated, though the RTX 4080 still wins. For users with a strict need to maximize performance in DX12, Vulkan, or compute tasks, the RTX 4080 is the only rational choice. For those who primarily play older DX11 titles and do not require high-end compute, the RX 6800 XT could offer a more cost-effective entry point, but the data shows it will still be slower in every measurable way.