RTX 4090
The 'expensive' GPU came out cheaper — we rented both to find out
We rented an A100 and an H100 back to back: the pricier card cost less per training run because it finished in half the time. Plus honest notes from the AI Engineer World's Fair floor, and a Qwen 3.7 open-weights status check.
RTX 5090 Benchmarks: 5090 vs 4090 vs Used 3090 (2026)
5090 community benches across 4K-131K context, prompt-processing tables, 5090-vs-4090 upgrade math, and InsiderLLM's firsthand 3090 honest-value anchor.
RTX 4090 vs Used RTX 3090 for Local AI: Which to Buy in 2026
Both have 24GB VRAM. One costs 2-3x more. RTX 4090 vs used RTX 3090 — real benchmarks, real prices, and who should buy which for local LLM inference and image generation.
What Can You Actually Run on 24GB VRAM?
Qwen 3.5 27B at Q4 fits in 17GB with 64K+ context. 70B at Q3 with limited context. Flux at full FP16. RTX 3090 at $700 vs 4090 at $1,800—every model that fits and which GPU to buy.