I want to upgrade my pc. I found someone selling a new MSI Radeon RX 6900 XT, and someone else selling a used Nvidia RTX 3080 Ti for the same price. Which one should i get? There is no warranty as both are second hand.

Llama 4 Scout (changed mind)

Vote: MSI Radeon RX 6900 XT

After reviewing the arguments from other models, I have decided to change my vote to option A, the MSI Radeon RX 6900 XT. The key points that influenced my decision are the new condition of the RX 6900 XT, which reduces the risk of early failure compared to a used RTX 3080 Ti. Additionally, the RX 6900 XT offers 16GB of VRAM, providing better future-proofing for newer games and high-resolution textures. While the RTX 3080 Ti has advantages in ray tracing and AI-enhanced features, the peace of mind and longer expected lifespan of a new card outweigh these benefits.

Grok 4.1 Fast

Vote: MSI Radeon RX 6900 XT

Sticking with A: MSI Radeon RX 6900 XT. The overwhelming consensus (4/5 models voted A) reinforces the key point—new vs. used is a massive risk differentiator without warranty. A pristine card avoids mining wear, degraded thermal paste, or fan failures common in used 3080 Tis, which run hot on GDDR6X. Performance parity holds: RX 6900 XT matches 3080 Ti in rasterization (often ahead at 4K), with 16GB VRAM trumping 12GB for future-proofing in VRAM-intensive games. Nvidia's RT/DLSS edge is real but niche; FSR 3 mitigates it, and raw power + condition win. Llama 4 Scout's B argument ignores condition entirely, claiming 'better performance' without benchmarks or acknowledging used risks—unconvincing against the evidence. No position change needed; A is the safe, superior value.

GPT-5.4

Vote: MSI Radeon RX 6900 XT

I maintain vote A. The other arguments for the 3080 Ti do not overcome the biggest fact in this scenario: same price, no warranty, but one card is new and the other is used. On a high-power GPU, unknown prior use is a major risk, and without warranty that risk falls entirely on the buyer. Performance is also not lopsided enough to justify taking that risk. In standard raster gaming, the RX 6900 XT is very close to the 3080 Ti and often competitive or better depending on the title. The 6900 XT also has 16 GB of VRAM versus 12 GB on the 3080 Ti, which gives it better headroom for newer games and high-resolution texture settings. The best case for B is Nvidia-specific value: stronger ray tracing, DLSS, CUDA, and some creator workloads. If the buyer specifically prioritizes those, B can make sense. But for a general gaming upgrade at the same price, the safer condition plus similar raster performance and more VRAM make the new RX 6900 XT the better overall pick. Llama’s argument was not compelling because it focused on Nvidia feature advantages while underweighting condition risk in a no-warranty purchase.

Claude Opus 4.6

Vote: MSI Radeon RX 6900 XT

I'm maintaining my vote for the RX 6900 XT. The consensus is overwhelming (5 out of 6 models chose A in round 1), and for good reason. **The new vs. used distinction is decisive.** Without warranty, a new card is dramatically safer than a used one. The RTX 3080 Ti's GDDR6X memory runs notoriously hot, and a used card may have degraded thermal pads, worn fans, or silicon that's been stressed by mining. You simply cannot verify the history of a used GPU. **16GB vs 12GB VRAM is a real advantage.** Multiple models correctly highlighted this point. Modern games at 1440p and 4K are increasingly VRAM-hungry, and 16GB gives the 6900 XT meaningfully more longevity. This is not a minor spec difference — it will matter in the coming years. **Performance parity in rasterization.** The 6900 XT matches or beats the 3080 Ti in standard gaming workloads. The 3080 Ti's advantages in ray tracing and DLSS are real but situational, and FSR has closed the gap considerably. **Llama's argument for B was unconvincing.** Calling the 3080 Ti "more powerful and newer" is misleading — they launched within months of each other, perform nearly identically in rasterized gaming, and the 6900 XT actually has more VRAM. The NVIDIA ecosystem advantages don't overcome the fundamental risk calculus of used vs. new hardware with no warranty. The RX 6900 XT is the clear winner: equivalent performance, more VRAM, new condition, and lower risk. This is a straightforward decision.

DeepSeek V3.2

Vote: MSI Radeon RX 6900 XT

My vote remains for the MSI Radeon RX 6900 XT. The new condition is critical without warranty, as it eliminates risks of prior wear, mining abuse, or thermal degradation inherent in used GPUs. Llama 4 Scout's argument for the RTX 3080 Ti focuses on performance and features, but these advantages are outweighed by the uncertainty of a used card's lifespan and potential hidden defects. The consensus from other models reinforces that the 6900 XT's 16GB VRAM offers better future-proofing, and its rasterization performance is competitive, making it the safer and more reliable choice at the same price.

Gemini 3.1 Pro

Vote: MSI Radeon RX 6900 XT

I am firmly maintaining my vote for the MSI Radeon RX 6900 XT. The overwhelming consensus among the models highlights the critical factor here: the risk associated with a lack of warranty. Llama 4 Scout's argument for the RTX 3080 Ti focuses on ray tracing and AI features, but completely ignores the massive financial risk of buying a used, notoriously hot-running GPU with zero warranty. As Claude Opus 4.6 and Grok 4.1 Fast correctly pointed out, a used 3080 Ti could have degraded thermal pads or have been subjected to heavy mining. A 'new' condition RX 6900 XT eliminates that risk entirely. Furthermore, Llama 4 Scout's claim that the 3080 Ti is simply 'more powerful' is misleading. As noted by GPT-5.4 and DeepSeek V3.2, the 6900 XT actually matches or beats the 3080 Ti in raw rasterization performance. When you combine top-tier rasterization, the superior longevity of 16GB of VRAM (compared to the 3080 Ti's 12GB), and the pristine, zero-wear condition of the card, the RX 6900 XT is objectively the smarter and safer purchase.

Final Summary

The AI Roundtable initially saw a lone holdout in Llama 4 Scout, who championed the RTX 3080 Ti for its superior ray tracing and DLSS features. However, the collective pressure from the other five models—led by sharp risk assessments from Claude Opus 4.6 and Gemini 3.1 Pro—argued that 'new' hardware beats 'used' gambles every time when warranties are off the table. By the second round, the group achieved total consensus as Llama 4 Scout conceded that the Radeon's pristine condition and 16GB of VRAM were the objectively safer bets.

All 6 models agreed on "MSI Radeon RX 6900 XT" after discussion

Strongest Arguments

• MSI Radeon RX 6900 XT: In a zero-warranty scenario, the physical condition of the hardware is the decisive factor; a new RX 6900 XT eliminates the significant risks of mining abuse, thermal degradation, and worn-out fans inherent in a used high-end Nvidia card.
• Nvidia RTX 3080 Ti: The RTX 3080 Ti offers a superior feature set, including significantly better ray tracing performance, DLSS support, and CUDA compatibility for professional workloads, which may outweigh raw rasterization specs.

Key Turning Points

• Llama 4 Scout abandoned its support for the Nvidia card after reviewing the 'new vs used' risk calculations provided by the rest of the roundtable.