AMD Radeon RX 6800 XT vs NVIDIA GeForce RTX 3080 Ti Comparison

The AMD Radeon RX 6800 XT and NVIDIA GeForce RTX 3080 Ti are both end-of-life flagship-tier graphics cards, but the benchmark data shows a clear split: the RTX 3080 Ti wins 8 out of 10 head-to-head tests, while the RX 6800 XT takes only 2. Despite the NVIDIA card’s dominance in raw performance metrics, the AMD card holds its ground in specific API workloads and offers a significantly larger memory pool. The RTX 3080 Ti is the stronger overall performer for most modern workloads, particularly DirectX 12 and Vulkan, while the RX 6800 XT is the better choice for legacy DirectX 11 scenarios and applications that favor its higher FP16 throughput.

The Verdict

The data points decisively toward the NVIDIA GeForce RTX 3080 Ti for users prioritizing maximum raw performance across the board. Its average benchmark score of 41187 places it in the 83rd percentile of all GPUs, and it wins the most demanding modern test — 3DMark Steel Nomad DX12 — by a huge 27.3% margin (5077 vs 3689). The RTX 3080 Ti also leads in every PassMark category except DirectX 11, including a 7.1% advantage in the overall G3D score (26896 vs 24980) and a 13.3% lead in GPU compute (15282 vs 13245). This is the card for users who want the highest frame rates in current titles and compute-heavy tasks.

The AMD Radeon RX 6800 XT is the more specialized pick. It wins only in Geekbench OpenCL (171304 vs 170037, a 0.7% edge) and PassMark DirectX 11 (264 vs 223, an 18.4% lead). Its 16 GB of GDDR6 memory is a major asset for texture-heavy workloads and future-proofing, but its 85th percentile ranking and 48477 average benchmark score are dragged down by a weak 3DMark result. Users who primarily run older DirectX 11 applications or need maximum VRAM for large datasets should consider the AMD card; everyone else should favor the NVIDIA.

The verdict is straightforward: the RTX 3080 Ti is the better all-rounder, but the RX 6800 XT is the superior choice for specific legacy API workloads and memory-hungry tasks.

Architecture Differences

The two cards employ fundamentally different architectures, which explains their distinct benchmark profiles. The RX 6800 XT uses the Navi 21 chip based on AMD’s RDNA 2.0 architecture, built on a 7 nm process at TSMC. It packs 26,800 million transistors on a 520 mm² die, yielding a transistor density of 51.5M per mm². The RTX 3080 Ti uses the GA102 chip based on NVIDIA’s Ampere architecture, fabricated on an 8 nm process at Samsung. It contains 28,300 million transistors across a much larger 628 mm² die, with a lower density of 45.1M per mm².

These architectural choices lead to stark differences in compute resources. The RX 6800 XT has 4,608 shading units, 288 texture mapping units, and 128 ROPs, along with 72 ray-tracing cores. The RTX 3080 Ti counters with 10,240 shading units, 320 TMUs, 112 ROPs, 80 RT cores, and 320 tensor cores. The NVIDIA card’s raw shader count is over double the AMD’s, which directly contributes to its higher FP32 throughput of 34.10 TFLOPS versus the RX 6800 XT’s 20.74 TFLOPS. However, the AMD card excels at FP16, delivering 41.47 TFLOPS (2:1 ratio) compared to the RTX 3080 Ti’s 34.10 TFLOPS (1:1 ratio).

Memory architecture also diverges significantly. The RX 6800 XT uses 16 GB of GDDR6 on a 256-bit bus, providing 512.0 GB/s of bandwidth. The RTX 3080 Ti uses 12 GB of faster GDDR6X on a wider 384-bit bus, achieving 912.4 GB/s. The NVIDIA card’s bandwidth advantage is enormous, but the AMD card offers 33% more capacity. Both support PCIe 4.0 x16, DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, but only the RX 6800 XT includes a USB Type-C display output alongside its HDMI 2.1 and two DisplayPort 1.4a ports; the RTX 3080 Ti has three DisplayPort 1.4a outputs.

Head-to-Head Benchmarks

The largest single victory for the RTX 3080 Ti comes in the 3DMark Steel Nomad DX12 test, where it scores 5077 against the RX 6800 XT’s 3689 — a 27.3% advantage. This is the most modern and demanding test in the set, and it reflects the NVIDIA card’s superior raw compute and memory bandwidth in contemporary DirectX 12 workloads. The Vulkan test tells a similar story: the RTX 3080 Ti scores 192697 versus 136875, a 29% lead that reinforces its dominance in modern cross-platform APIs.

The PassMark suite shows a consistent pattern of NVIDIA wins, albeit with smaller margins. In DirectX 10, the RTX 3080 Ti wins 184 vs 155 (15.8% ahead). DirectX 12 sees a 9.1% lead (110 vs 100). The DirectX 9 test is close, with the NVIDIA card winning 274 vs 265 (3.3% ahead). The 2D test (PassMark G2D) goes to NVIDIA at 1091 vs 1030 (5.6% lead). The overall G3D score favors NVIDIA at 26896 vs 24980 (7.1% ahead), and the GPU compute test shows a 13.3% NVIDIA advantage (15282 vs 13245).

The RX 6800 XT’s two wins are notable for their contexts. Its PassMark DirectX 11 score of 264 crushes the RTX 3080 Ti’s 223, an 18.4% margin that suggests the AMD architecture retains strong performance in legacy API paths. The Geekbench OpenCL result is a near-tie, with the RX 6800 XT scoring 171304 versus the RTX 3080 Ti’s 170037 — a marginal 0.7% lead that shows the two cards are essentially equal in this compute benchmark, despite the NVIDIA card’s higher FP32 peak.

Specification Differences

The two cards differ in almost every major specification category. The process node is a key distinction: AMD uses 7 nm TSMC, while NVIDIA uses 8 nm Samsung. The RX 6800 XT has a higher base clock (1825 MHz vs 1365 MHz) and boost clock (2250 MHz vs 1665 MHz), but the RTX 3080 Ti compensates with far more shaders and higher memory clocks (19 Gbps effective vs 16 Gbps). The RX 6800 XT has a game clock of 2015 MHz, a feature the NVIDIA card lacks entirely.

Memory capacity and bandwidth are direct trade-offs: 16 GB GDDR6 on a 256-bit bus (512.0 GB/s) for AMD versus 12 GB GDDR6X on a 384-bit bus (912.4 GB/s) for NVIDIA. The RTX 3080 Ti has more TMUs (320 vs 288) and RT cores (80 vs 72), plus 320 tensor cores that the RX 6800 XT does not have at all. The AMD card has more ROPs (128 vs 112) and achieves a higher pixel rate (288.0 GPixel/s vs 186.5 GPixel/s), but the NVIDIA card wins on texture rate (532.8 GTexel/s vs 648.0 GTexel/s is actually AMD’s number — wait, the data shows AMD’s texture rate is 648.0 GTexel/s and NVIDIA’s is 532.8 GTexel/s, so AMD wins that one).

Power requirements also differ: the RX 6800 XT has a 300 W TDP with 2x 8-pin connectors and a 700 W suggested PSU, while the RTX 3080 Ti has a 350 W TDP with a single 12-pin connector and a 750 W suggested PSU. Physically, the AMD card is shorter (267 mm vs 285 mm) and taller (120 mm vs 112 mm) but thicker (50 mm vs 40 mm). The RTX 3080 Ti launched at an MSRP of 1,199 USD, while the RX 6800 XT launched at 649 USD.

FAQ

Q: Which card has more memory?

A: The AMD Radeon RX 6800 XT has 16 GB of GDDR6 memory, while the NVIDIA GeForce RTX 3080 Ti has 12 GB of GDDR6X memory. The AMD card offers 33% more capacity.

Q: Which card is faster in the 3DMark Steel Nomad DX12 test?

A: The NVIDIA GeForce RTX 3080 Ti is significantly faster, scoring 5077 versus the RX 6800 XT’s 3689, a 27.3% advantage for NVIDIA.

Q: Does the RX 6800 XT win any benchmark?

A: Yes, the RX 6800 XT wins two tests: Geekbench OpenCL (171304 vs 170037, a 0.7% lead) and PassMark DirectX 11 (264 vs 223, an 18.4% lead).

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

A: The RX 6800 XT has an average benchmark score of 48477, which places it in the 85th percentile of all GPUs. The RTX 3080 Ti has an average score of 41187, placing it in the 83rd percentile.

Q: Which card has a higher boost clock?

A: The AMD Radeon RX 6800 XT has a boost clock of 2250 MHz, compared to the NVIDIA GeForce RTX 3080 Ti’s 1665 MHz.

Q: Which card offers more bandwidth?

A: The NVIDIA GeForce RTX 3080 Ti offers 912.4 GB/s of memory bandwidth, far exceeding the RX 6800 XT’s 512.0 GB/s.

Where Each One Wins

The NVIDIA GeForce RTX 3080 Ti wins in almost every modern and compute-oriented scenario. Its 27.3% lead in 3DMark Steel Nomad DX12 makes it the clear choice for DirectX 12 gaming at high resolutions and settings. The 29% advantage in Geekbench Vulkan indicates superior performance in Vulkan-based titles and applications. The 13.3% lead in PassMark GPU compute positions it well for rendering, machine learning inference, and other parallel workloads. Its higher FP32 throughput (34.10 TFLOPS) and massive bandwidth (912.4 GB/s) support these results. The RTX 3080 Ti also wins in DirectX 9, DirectX 10, DirectX 12, and 2D tests, making it the more versatile card for a broad range of software.

The AMD Radeon RX 6800 XT wins in narrower but specific niches. Its 18.4% victory in PassMark DirectX 11 makes it the better option for older games and legacy applications that rely on this API. The 0.7% edge in Geekbench OpenCL, while small, shows parity in that compute environment. Its 16 GB memory capacity is a significant advantage for modded games, high-resolution texture packs, and professional workloads that exceed 12 GB. The card’s higher pixel rate (288.0 GPixel/s vs 186.5 GPixel/s) and texture rate (648.0 GTexel/s vs 532.8 GTexel/s) suggest strong fill-rate performance in certain rasterization scenarios. Users running DirectX 11-heavy workloads or needing maximum VRAM should choose the RX 6800 XT; all other users should opt for the RTX 3080 Ti.