Guide · Local AI
Best GPU for local AI in 2026
Why VRAM beats pure FPS for local AI
Local LLMs and image models load weights into GPU memory. A slower card with 24GB often beats a faster 12GB card on what you can run. That is why used 3090s still sell years after launch.
VRAM tiers
- 8–12GB — small quantized models. 5060 / 5070 / 3060 12GB / 4070.
- 16GB — mid-size models. 5070 Ti, 5080, 4070 Ti Super, 4080, 5060 Ti 16GB, RX 9070 / 7800 XT.
- 20–24GB — common consumer target. 3090, 4090, 7900 XTX / XT.
- 32GB — RTX 5090 for larger local models without a workstation bill.
- 48GB+ — A6000 / 6000 Ada for heavy local work with fewer compromises.
Ranked picks (used market)
- NVIDIA GeForce RTX 5090 — 32GB · fair ~$3,200. 32GB consumer flagship for local LLMs and heavy image/video gen. Beats 24GB cards on model size; power and used prices are the tradeoff.
- NVIDIA GeForce RTX 3090 — 24GB · fair ~$950. Still the dollars-per-GB pick for 24GB local AI when used prices stay near fair value. Dual-card builds remain common.
- NVIDIA GeForce RTX 4090 — 24GB · fair ~$1,800. Fastest common 24GB card for local LLM inference and image/video gen. Same VRAM as 3090 with much higher compute.
- NVIDIA GeForce RTX 5080 — 16GB · fair ~$1,100. 16GB Blackwell high-end. Strong for mid-size local models and gaming; less VRAM headroom than 3090/4090/5090 for large models.
- NVIDIA GeForce RTX 5070 Ti — 16GB · fair ~$780. 16GB Blackwell mid/high. Competes with used 4070 Ti Super and 4080-class cards for mid-size local models.
- NVIDIA GeForce RTX 5070 — 12GB · fair ~$520. 12GB Blackwell. Fine for smaller quantized models and 1440p gaming; step up VRAM if large LLMs are the goal.
- NVIDIA GeForce RTX 5060 Ti 16GB — 16GB · fair ~$450. Budget 16GB Blackwell. Useful mid-size local models without a 4070 Ti Super / 5080 bill.
- NVIDIA GeForce RTX 5060 Ti 8GB — 8GB · fair ~$320. 8GB limits larger local models. Prefer the 16GB Ti if buying mainly for AI.
Used 3090 vs new alternatives
When used 3090 prices spike past fair high, some buyers switch to new AMD 24GB cards or 16GB Ada cards with warranty. Compare total dollars and CUDA ecosystem needs before switching.
What about Macs?
Apple Silicon is a real local-AI option because of unified memory (not VRAM). A Mac mini with 24–32GB or a used high-RAM Mac Studio can load models that fight a 24GB GPU — usually at lower tokens/sec and without CUDA. We track fair prices under Macs for local AI and compare stacks in Mac vs GPU.
Buying checklist
- Confirm full model name (avoid laptop / mobile variants).
- Ask for photos of the card, ports, and fan condition.
- Prefer local meetup or returns-friendly sellers for $800+ cards.
- PSU: 3090/4090/5090 need serious wattage and enough PCIe power cables.
- Cross-check our fair value page and eBay sold comps before bidding.
FAQ
What is the best used GPU for local AI in 2026?
For most buyers, a used RTX 3090 (24GB) is still the best value — fair about $950 as of 2026-07-26. Take a 4090 for more speed at 24GB, a 5090 (32GB) when you need more VRAM and can pay for it, or a 48GB workstation / high-RAM Mac when 24GB is not enough.
How much VRAM do I need for local LLMs?
12GB is entry-level for small quantized models; 16GB is mid-tier; 24GB is the common consumer target; 32GB (5090) and 48GB workstation cards open larger models with fewer compromises.