AMD Radeon RX 6900 XT vs NVIDIA GeForce RTX 3080 Ti Comparison

The Verdict

The recorded data presents a clear but nuanced picture. The NVIDIA GeForce RTX 3080 Ti wins 7 of 10 head-to-head benchmark comparisons, while the AMD Radeon RX 6900 XT takes 3. The overall average benchmark score tells a different story: the AMD card averages 50,951, while the NVIDIA card averages 41,187. This discrepancy is significant. The RTX 3080 Ti sits at the 83rd percentile of all GPUs, while the RX 6900 XT sits higher at the 86th percentile. The data suggests that the AMD card is the more consistent performer across a broad suite of tests, while the NVIDIA card has focused strengths in specific modern workloads.

For buyers prioritizing raw compute and legacy API performance, the RX 6900 XT is the stronger choice. Its 23.04 TFLOPS FP32 throughput and wins in OpenCL and DirectX 11 tests indicate a card that handles diverse compute tasks with ease. For those focused on the latest DirectX 12 and Vulkan titles, the RTX 3080 Ti is the better option. Its decisive victories in 3DMark Steel Nomad and Geekbench Vulkan show a clear advantage in modern gaming APIs. The RTX 3080 Ti also offers a larger frame buffer advantage in bandwidth, with 912.4 GB/s versus 512.0 GB/s, which can matter at high resolutions.

Where Each One Wins

The AMD Radeon RX 6900 XT establishes its territory in compute-oriented and legacy DirectX workloads. In Geekbench OpenCL, it scores 187,673, a 10.4% lead over the RTX 3080 Ti's 170,037. This is a substantial margin for a general-purpose compute benchmark. The pattern continues in PassMark DirectX 11, where the AMD card scores 279 versus 223, a 25.1% advantage. Even in DirectX 12, the older AMD architecture manages a narrow win, 113 to 110, a 2.7% margin. These results indicate the RX 6900 XT's RDNA 2 architecture retains strong performance in API environments that many modern games still use.

The NVIDIA GeForce RTX 3080 Ti dominates in the newest graphics APIs and synthetic rasterization tests. In 3DMark Steel Nomad DX12, it scores 5077 against the AMD card's 4079, a massive 19.7% lead. Geekbench Vulkan shows a similar gap, with the NVIDIA card at 192,697 versus 148,525, a 22.9% advantage. The RTX 3080 Ti also wins in DirectX 9 (274 vs 268, a 2.2% margin), DirectX 10 (184 vs 167, a 9.2% margin), and PassMark G3D (26,896 vs 26,732, a 0.6% margin). It also takes the GPU compute test, 15,282 to 14,547, a 4.8% lead. In 2D performance, the NVIDIA card edges ahead, 1091 to 1055, a 3.3% difference.

Architecture Differences

The two cards represent fundamentally different design philosophies. The AMD Radeon RX 6900 XT uses the Navi 21 chip built on RDNA 2.0 architecture, fabricated on a 7 nm process at TSMC. It packs 26,800 million transistors into a 520 mm² die, yielding a transistor density of 51.5 million per square millimeter. The NVIDIA GeForce RTX 3080 Ti uses the GA102 chip with Ampere architecture, built on Samsung's 8 nm process. It contains 28,300 million transistors on a larger 628 mm² die, but the density is lower at 45.1 million per square millimeter.

The memory subsystems diverge sharply. The AMD card uses 16 GB of GDDR6 on a 256-bit bus, delivering 512.0 GB/s of bandwidth. The NVIDIA card uses 12 GB of GDDR6X on a 384-bit bus, delivering 912.4 GB/s, which is 78% more bandwidth. Clock speeds also differ: the AMD card boosts to 2250 MHz, while the NVIDIA card boosts to 1665 MHz. The AMD card has a game clock of 2015 MHz, a feature the NVIDIA card lacks entirely.

The compute structures show different approaches. The RX 6900 XT has 5120 shading units, 320 TMUs, and 128 ROPs. The RTX 3080 Ti has 10,240 shading units, 320 TMUs, and 112 ROPs. Both have 80 RT cores. The NVIDIA card adds 320 tensor cores, which the AMD card does not have. Pixel rates favor AMD at 288.0 GPixel/s versus 186.5 GPixel/s, while texture rates favor AMD at 720.0 GTexel/s versus 532.8 GTexel/s. FP32 throughput favors NVIDIA at 34.10 TFLOPS versus 23.04 TFLOPS, but FP16 on AMD is 46.08 TFLOPS (2:1), while NVIDIA's is 34.10 TFLOPS (1:1).

FAQ

Q: Which card has a higher average benchmark score?

A: The AMD Radeon RX 6900 XT averages 50,951 across all recorded benchmarks, while the NVIDIA GeForce RTX 3080 Ti averages 41,187.

Q: How do the cards compare in Vulkan performance?

A: The RTX 3080 Ti leads significantly in Geekbench Vulkan, scoring 192,697 versus the RX 6900 XT's 148,525, a 22.9% advantage.

Q: Which card offers more memory and bandwidth?

A: The RX 6900 XT has 16 GB of GDDR6 on a 256-bit bus, while the RTX 3080 Ti has 12 GB of GDDR6X on a 384-bit bus. The NVIDIA card delivers 912.4 GB/s bandwidth versus 512.0 GB/s.

Q: What are the power requirements?

A: The RX 6900 XT has a 300 W TDP and suggests a 700 W PSU. The RTX 3080 Ti has a 350 W TDP and suggests a 750 W PSU.

Q: Which card wins in DirectX 11 benchmarks?

A: The RX 6900 XT holds a decisive 25.1% lead, scoring 279 versus 223 in PassMark DirectX 11.

Q: What is the launch MSRP for each card?

A: The RX 6900 XT has a launch MSRP of 999 USD, while the RTX 3080 Ti has a launch MSRP of 1,199 USD.

Head-to-Head Benchmarks

The most striking result is in 3DMark Steel Nomad DX12. The RTX 3080 Ti scores 5077, which is 19.7% ahead of the RX 6900 XT's 4079. This is the largest single-test margin in either direction and indicates a substantial advantage for NVIDIA in modern DirectX 12 rasterization. The Vulkan test reinforces this, with NVIDIA leading by 22.9%, scoring 192,697 versus 148,525. These two tests alone suggest that for current-generation gaming APIs, the RTX 3080 Ti is the clear choice.

The AMD card's biggest win comes in PassMark DirectX 11, where it scores 279 against 223, a 25.1% margin. This is particularly notable because DirectX 11 remains a widely used API in many popular titles. The OpenCL result also favors AMD, with a 10.4% lead (187,673 vs 170,037), showing strength in compute workloads. The DirectX 12 PassMark test is close, with AMD winning 113 to 110, a 2.7% margin, which contrasts with the much larger NVIDIA lead in the 3DMark Steel Nomad DX12 test.

The remaining tests are closer. NVIDIA wins DirectX 9 by 2.2% (274 vs 268), DirectX 10 by 9.2% (184 vs 167), and PassMark G3D by 0.6% (26,896 vs 26,732). The GPU compute test goes to NVIDIA by 4.8% (15,282 vs 14,547). The 2D test is also NVIDIA's, 1091 to 1055, a 3.3% margin. Overall, the RTX 3080 Ti wins 7 tests, but the RX 6900 XT wins the two tests that matter most for legacy compatibility and general compute.

Specification Differences

The process node and foundry differ: AMD uses TSMC's 7 nm process, while NVIDIA uses Samsung's 8 nm. The transistor counts are close, 26,800 million for AMD and 28,300 million for NVIDIA, but the die sizes differ substantially, 520 mm² versus 628 mm². The RX 6900 XT has a higher transistor density at 51.5M per mm² versus 45.1M per mm².

Clock speeds show AMD's advantage: base clock of 1825 MHz versus 1365 MHz, boost clock of 2250 MHz versus 1665 MHz, and a game clock of 2015 MHz for AMD only. Memory clocks also differ, with AMD at 2000 MHz (16 Gbps effective) and NVIDIA at 1188 MHz (19 Gbps effective). The memory bus width is 256-bit for AMD and 384-bit for NVIDIA, with corresponding bandwidth of 512.0 GB/s versus 912.4 GB/s.

Memory capacity and type differ: 16 GB GDDR6 versus 12 GB GDDR6X. Shading units are 5120 for AMD and 10,240 for NVIDIA, while ROPs are 128 for AMD and 112 for NVIDIA. Tensor cores exist only on NVIDIA (320). Pixel rate is 288.0 GPixel/s for AMD and 186.5 GPixel/s for NVIDIA. Texture rate is 720.0 GTexel/s for AMD and 532.8 GTexel/s for NVIDIA. FP32 is 23.04 TFLOPS for AMD and 34.10 TFLOPS for NVIDIA, while FP16 is 46.08 TFLOPS (2:1) for AMD and 34.10 TFLOPS (1:1) for NVIDIA.

Power and physical design differ: AMD has a 300 W TDP with a triple-slot cooler and 2x 8-pin connectors, while NVIDIA has a 350 W TDP with a dual-slot cooler and 1x 12-pin connector. Suggested PSU is 700 W for AMD and 750 W for NVIDIA. Dimensions differ: AMD is 267 mm long, 120 mm high, and 50 mm wide, while NVIDIA is 285 mm long, 112 mm high, and 40 mm wide. Display outputs are 1x HDMI 2.1, 2x DisplayPort 1.4a, and 1x USB Type-C for AMD, versus 1x HDMI 2.1 and 3x DisplayPort 1.4a for NVIDIA. Both use PCIe 4.0 x16 and support DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.