Our Top Picks
For pure rasterized gaming at 1080p and 1440p, the RX 6900 XT is the slightly better buy: it matches or edges out the RTX 3080 Ti there, has 16 GB of VRAM instead of 12 GB, and draws less power. The RTX 3080 Ti is the better pick for ray tracing, DLSS upscaling and 4K, where it usually pulls a few percent ahead. On the used market, which is where both cards are found now, the cheaper of the two at a given condition usually wins.
Both cards launched as flagship-level parts of the 2020-2021 generation. The RX 6900 XT arrived first at $999, and the RTX 3080 Ti followed at $1,199 with near-RTX 3090 performance. Two generations later, both sit around the level of current upper-mid-range cards, and both are sold mostly secondhand.
GIGABYTE PowerColor Red Devil AMD Radeon™ RX 6900 XT Gaming Graphics Card with 16GB GDDR6 Memory, Powered by AMD RDNA™ 2, Raytracing, PCI Express 4.0, HDMI 2.1, AMD Infinity Cache
Chosen because it specifies Powered by AMD RDNA™ 2 and Raytracing.
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GIGABYTE Radeon RX 6900 XT Gaming OC 16G Graphics Card, WINDFORCE 3X Cooling System, 16GB 256-bit GDDR6, GV-R69XTGAMING OC-16GD Video Card
Chosen because it specifies WINDFORCE 3X Cooling System and 16GB 256-bit GDDR6.
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Geforce RTX 3080 Ti 12GB GDDR6X PCI Express 4.0 Graphics Card Titanium and Black (Renewed)
Picked as a relevant option in this category.
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Geforce RTX 3080 Ti 12GB GDDR6X PCI Express 4.0 Graphics Card Titanium and Black
Picked as a relevant option in this category.
View on AmazonSpecifications Compared
| Specification | RX 6900 XT | RTX 3080 Ti |
|---|---|---|
| Architecture | RDNA 2.0 | Ampere |
| Release date | 28 October 2020 | 31 May 2021 |
| Launch price (MSRP) | $999 | $1,199 |
| Shaders | 5120 stream processors | 10240 CUDA cores |
| Boost clock | 2250 MHz | 1665 MHz |
| Process | 7 nm | 8 nm |
| TDP | 300 W | 350 W |
| Memory | 16 GB GDDR6 | 12 GB GDDR6X |
| Memory bus | 256-bit | 384-bit |
| Bandwidth | 512.0 GB/s | 912.4 GB/s |
| Cache | 4 MB L2 + 128 MB L3 | 6 MB L2 |
| Interface | PCIe 4.0 x16 | PCIe 4.0 x16 |
| Power connectors | 2x 8-pin | 1x 12-pin |
| Length / width | 267 mm, 3-slot | 285 mm, 2-slot |
| Outputs | 1x HDMI 2.1, 2x DP 1.4a, 1x USB Type-C | 1x HDMI, 3x DisplayPort |
Shader counts cannot be compared directly across these architectures: Ampere counts its dual-issue FP32 units differently, so 10240 CUDA cores do not mean twice the gaming throughput of 5120 RDNA 2 stream processors. The more telling difference is the memory design. AMD pairs a modest 256-bit bus with a 128 MB Infinity Cache, while NVIDIA uses a wide 384-bit GDDR6X bus with nearly 80% more raw bandwidth. That is why the RX 6900 XT does well at lower resolutions and the 3080 Ti gains ground at 4K.
Rasterized Gaming
Reviews from the launch period and since tell a consistent story with small shifts:
- Data compiled by WePC from Tom’s Hardware testing shows the RX 6900 XT about 4% ahead at 1080p, roughly even at 1440p, and the 3080 Ti a few frames ahead on average at 4K.
- Digital Trends found the 6900 XT about 9% faster at 1440p and about 14% faster at 1080p with Smart Access Memory enabled, and very little difference at 4K.
- More recent per-game data on newer titles shows a wider spread, with some newer games favoring the 3080 Ti by double digits and others staying even.
Overall, the cards are within roughly 0-10% of each other at 1080p and 1440p, often with AMD slightly ahead, and the RTX 3080 Ti is about 3-8% faster at 4K. In demanding modern games at 1440p high settings, both typically run in the 70-110 FPS range. That figure varies a lot with game, settings, CPU and driver version.
Enabling Resizable BAR (Smart Access Memory on AMD platforms) helps the RX 6900 XT more than the 3080 Ti, so make sure it is turned on in your motherboard BIOS.
Ray Tracing
The RTX 3080 Ti wins this clearly. Ampere’s second-generation RT cores are considerably stronger than RDNA 2’s first-generation ray accelerators. In RT-heavy titles such as Cyberpunk 2077, Alan Wake 2 or Control, the 3080 Ti is often well ahead, and in path-traced modes the 6900 XT falls to frame rates that are not practically usable. If ray tracing is a priority, the NVIDIA card is the obvious choice.
Upscaling and Frame Generation
The RTX 3080 Ti supports DLSS Super Resolution, including the DLSS 4 transformer model, and DLSS Ray Reconstruction. It does not support DLSS Frame Generation, which requires RTX 40 or newer. The RX 6900 XT uses FSR 3.1 and earlier versions. Both cards can use FSR 3 frame generation in games that support it, and AMD Fluid Motion Frames works on the Radeon at the driver level.
Upscaling quality is where the gap shows. DLSS 4 upscaling looks clearly better than FSR 3.1, especially in Balanced and Performance modes, where FSR tends to shimmer and lose fine detail. Neither card supports FSR 4, which is limited to RDNA 4 hardware. In games that need upscaling to run at high settings, the 3080 Ti gets a noticeably sharper image at the same performance level.
VRAM Headroom
This is where the RX 6900 XT has an advantage. 16 GB against 12 GB matters more in 2026 than it did at launch:
- 1440p: both cards are fine in nearly all games. 12 GB covers most titles at high settings.
- 4K with max textures: some recent games go past 12 GB, causing stuttering or reduced texture quality on the 3080 Ti. The 6900 XT has room to spare.
- Modding: high-resolution texture packs in games like Skyrim or Cyberpunk benefit from 16 GB.
For longevity in raster workloads, 16 GB is the more future-proof amount.
Power, PSU and Physical Fit
The RTX 3080 Ti is rated at 350 W, and Ampere is known for sharp transient spikes. The RX 6900 XT is rated at 300 W. Sizing the PSU as GPU TDP + CPU + about 150 W of headroom, with a 125 W CPU:
- RTX 3080 Ti: 350 + 125 + 150 = 625 W, so a quality 750-850 W unit is recommended.
- RX 6900 XT: 300 + 125 + 150 = 575 W, so a quality 750 W unit is comfortable.
Connectors differ. The 3080 Ti Founders Edition uses a 12-pin connector with an included 2x 8-pin adapter, while partner cards commonly use standard 8-pin plugs. The RX 6900 XT uses two 8-pin connectors. Size is also different: the 6900 XT reference card is 267 mm and 3 slots thick, and the 3080 Ti is 285 mm and 2 slots. A thinner card leaves more room for airflow or another expansion card. Partner models of both often run larger, so measure before buying.
Used Prices and Value
Both cards are now mostly used purchases. Typical ranges: the RX 6900 XT usually sells for about $300-$400 used, and the RTX 3080 Ti for about $350-$450 used, depending on model, cooler and condition. NVIDIA cards often carry a small premium because of DLSS and CUDA support.
Cost per performance at launch MSRP, treating 1440p raster as equal (100 each): RX 6900 XT $999 / 100 = $9.99, RTX 3080 Ti $1,199 / 100 = $11.99. At launch the AMD card offered about 17% better raster value. On the used market, compare actual listings in the same way: divide price by roughly equal performance, then decide how much DLSS and ray tracing are worth to you.
Which to Pick by Resolution and Priority
| Priority | RX 6900 XT | RTX 3080 Ti |
|---|---|---|
| 1080p/1440p raster, high refresh | Slight edge | Close behind |
| 4K raster | Close behind | Few percent ahead |
| Ray tracing | Weak | Clear winner |
| Upscaling quality | FSR 3.1 | DLSS 4 (better) |
| VRAM longevity | 16 GB (better) | 12 GB |
| Power and heat | 300 W (better) | 350 W |
| Creative apps (CUDA, Blender) | Limited | Stronger support |
What to Check When Buying Used
- Run a 15-20 minute stress test and watch hotspot and memory temperatures. GDDR6X on the 3080 Ti runs hot and may need new thermal pads.
- Listen for coil whine and fan bearing noise.
- Ask about mining history. A mining card is not automatically bad, but well-maintained fans and pads matter.
- Confirm the Founders Edition 12-pin adapter is included if you are buying that model.
Conclusion
It is close. The RX 6900 XT wins on raster at common resolutions, VRAM and efficiency. The RTX 3080 Ti wins on ray tracing, DLSS image quality and 4K. A raster-focused 1440p player on a budget is better served by the 6900 XT. Anyone who turns on ray tracing, relies on upscaling or uses CUDA-based software should pay the small premium for the 3080 Ti.
Frequently Asked Questions
Is the RX 6900 XT faster than the RTX 3080 Ti?
In rasterized games at 1080p and 1440p, the RX 6900 XT is usually equal or slightly faster, especially with Smart Access Memory on. At 4K, the RTX 3080 Ti tends to lead by a few percent. With ray tracing enabled, the 3080 Ti is clearly faster.
Does the RTX 3080 Ti have enough VRAM in 2026?
For 1440p gaming, 12 GB is enough for nearly all current titles at high settings. At 4K with maximum textures, a few recent games can go past 12 GB, which leads to stutter or lower texture quality. The RX 6900 XT’s 16 GB offers more headroom for those cases.
Can either card use DLSS Frame Generation or FSR 4?
No. DLSS Frame Generation requires RTX 40 series or newer, and FSR 4 is limited to RDNA 4 (RX 9000) cards. Both can use FSR 3 frame generation in supported games. The RTX 3080 Ti also gets DLSS 4 upscaling, which looks better than FSR 3.1.
What PSU wattage should I use for these cards?
A quality 750 W PSU works well for the RX 6900 XT with a typical gaming CPU. For the RTX 3080 Ti, 750-850 W is safer because of its 350 W rating and transient power spikes. Choose a reputable unit with separate PCIe cables for each connector.
Which card is better for streaming and content creation?
The RTX 3080 Ti generally has the edge, because of NVIDIA’s NVENC encoder and wider CUDA support in apps like Blender and DaVinci Resolve. The RX 6900 XT can stream and edit, but software support for NVIDIA hardware is broader. For pure gaming, the difference matters much less.
