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?

Llama 4 Scout (changed mind)

Vote: MSI Radeon RX 6900 XT

The majority of the models, including GPT-5.4, Grok 4.1 Fast, Claude Opus 4.6, Gemini 3.1 Pro, and DeepSeek V3.2, have voted for the MSI Radeon RX 6900 XT. Their arguments emphasize the benefits of buying a new GPU over a used one, such as warranty coverage, no risk of prior wear or damage, and future-proofing with 16GB of VRAM. While I initially argued in favor of the Nvidia RTX 3080 Ti due to its performance in ray tracing and AI-enhanced graphics, the consensus highlights significant advantages in reliability, warranty, and VRAM capacity that outweigh the niche benefits of the RTX 3080 Ti.

Grok 4.1 Fast

Vote: MSI Radeon RX 6900 XT

Sticking with A: MSI Radeon RX 6900 XT. The overwhelming consensus (4/5 models including GPT-5.4, Claude, Gemini, DeepSeek) prioritizes new condition, warranty, and 16GB VRAM over used 3080 Ti risks. Llama's B vote overstates Nvidia's RT/DLSS edge—rasterization is neck-and-neck (TechPowerUp benchmarks: 6900 XT matches or beats 3080 Ti at 1440p/4K in many titles), and FSR 3 narrows the gap. Used GPUs from 2021 crypto era often have degraded thermals/mining wear; no warranty means buyer bears failure risk. Equal price + superior new reliability + VRAM future-proofing (e.g., Cyberpunk 4K ultra needs >12GB) seals it. Final call: New 6900 XT is the no-brainer upgrade for most gamers—avoid used roulette.

GPT-5.4

Vote: MSI Radeon RX 6900 XT

I’m keeping my vote for A: the new MSI Radeon RX 6900 XT. The other A-side arguments reinforced the key point: at the same price, new condition is a major advantage. Warranty, zero wear, and much lower risk matter a lot on a high-power GPU from this generation. A used 3080 Ti could be fine, but it carries real uncertainty around prior mining, thermals, and remaining lifespan. The performance case still favors the 6900 XT overall value. In rasterized gaming, it is broadly in the same class as the 3080 Ti, and the 16GB VRAM is a meaningful edge over 12GB for longer-term usability. The argument for B was not compelling enough because it overstated the 3080 Ti as simply the higher-performance card without adequately pricing in the used-vs-new risk. Nvidia does have better ray tracing, DLSS, and CUDA, but those are only decisive if the buyer specifically needs them. So my final position remains: unless the user explicitly prioritizes Nvidia-exclusive features or creator workloads, the smarter buy at equal price is the new RX 6900 XT.

DeepSeek V3.2

Vote: MSI Radeon RX 6900 XT

I maintain my vote for the new MSI Radeon RX 6900 XT. The primary advantage is its new condition, which guarantees a full warranty, no prior wear from mining or overclocking, and peace of mind—factors that significantly outweigh the marginal performance benefits of a used RTX 3080 Ti. The RX 6900 XT's 16GB of VRAM provides better future-proofing for high-resolution gaming and mods compared to the 3080 Ti's 12GB, addressing growing VRAM demands in modern titles. Llama 4 Scout's argument for the RTX 3080 Ti based on ray tracing and DLSS superiority is valid but niche. These features do not justify the inherent risks of used hardware, especially when rasterization performance is comparable and AMD's FSR has closed the upscaling gap. At the same price, the safety and longevity of a new card make it the smarter investment, ensuring reliable performance without hidden costs or failures.

Gemini 3.1 Pro

Vote: MSI Radeon RX 6900 XT

I stand by the overwhelming consensus of this panel in favor of the new MSI Radeon RX 6900 XT. Llama 4 Scout argues that the 3080 Ti's used condition at the same price makes it a 'more valuable choice,' which is frankly a contradiction. A used item carrying the exact same price tag as a brand-new, equally tiered competitor is inherently a worse value due to the assumed risk of component degradation, no return policy, and the total lack of a manufacturer warranty. The new RX 6900 XT provides 16GB of VRAM (which is becoming increasingly crucial for modern 1440p and 4K gaming) versus the 3080 Ti's 12GB, alongside identical or slightly superior rasterization performance. Unless the user has a strict professional need for CUDA cores or heavily prioritizes Ray Tracing above all else, the peace of mind, warranty, and VRAM longevity of the brand-new 6900 XT make it the definitive and safest choice.

Claude Opus 4.6

Vote: MSI Radeon RX 6900 XT

I'm maintaining my vote for the new MSI Radeon RX 6900 XT. The consensus is overwhelming — 5 out of 6 models voted A in round 1, and the arguments all converge on the same key points. The new vs. used distinction is the single most important factor here. A brand-new GPU comes with full manufacturer warranty, zero wear on components, and no risk of prior mining abuse or thermal degradation. A used RTX 3080 Ti from this era carries real risk — these cards ran hot and were heavily targeted by miners. Performance is effectively a wash in rasterization, with the 6900 XT sometimes winning at 1440p and trading blows at 4K. The 3080 Ti's ray tracing and DLSS advantages are real but situational — not every game supports them, and FSR has closed the gap meaningfully. The 16GB vs 12GB VRAM difference is increasingly relevant. Modern titles like Alan Wake 2, Hogwarts Legacy, and others are pushing past 12GB at high settings and resolutions. That extra 4GB extends the useful life of the card. Llama's argument for B wasn't compelling — it essentially said the 3080 Ti has 'higher performance capabilities,' which overstates the difference and completely ignores the massive risk/value differential of buying used vs. new at the same price. Superior ray tracing alone doesn't justify accepting unknown card history and no warranty. At equal pricing, new with warranty and more VRAM decisively beats used with marginal feature advantages. The RX 6900 XT is the clear winner.

Final Summary

The AI Roundtable initially split over the classic performance-versus-reliability debate, with Llama 4 Scout standing alone in favor of the Nvidia RTX 3080 Ti's superior ray tracing. However, the other five models—GPT-5.4, Grok 4.1 Fast, Claude Opus 4.6, Gemini 3.1 Pro, and DeepSeek V3.2—launched a coordinated defense of the new MSI Radeon RX 6900 XT, citing the 'used hardware roulette' of buying potentially mined-out GPUs. By the second round, Llama 4 Scout surrendered its position, acknowledging that a manufacturer warranty and 16GB of VRAM were more practical than niche Nvidia features when both cards cost the same.

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

Strongest Arguments

• MSI Radeon RX 6900 XT: Buying new provides a full manufacturer warranty and eliminates the risk of receiving a card degraded by heavy crypto-mining or poor thermal management, making it the significantly safer investment at an identical price point.
• Nvidia RTX 3080 Ti: The RTX 3080 Ti offers superior ray tracing performance and DLSS support, which remain the gold standard for high-end visual fidelity in modern gaming.

Key Turning Points

• In Round 1, Gemini 3.1 Pro and Claude Opus 4.6 highlighted that the 3080 Ti's 12GB VRAM is becoming a bottleneck compared to the 6900 XT's 16GB.
• Gemini 3.1 Pro explicitly challenged Llama 4 Scout's logic, noting that a used item costing the same as a new competitor is 'inherently a worse value.'
• Llama 4 Scout conceded in Round 2, admitting the reliability and warranty of the AMD card outweighed the RTX features.