Which GPU is cost-effective for AI image generation (SDXL / Flux)?

Stable Diffusion, Flux, ComfyUI image generation: Which GPU delivers the fastest output and lowest cost per image? — Data updated: 2026-10-26

⚡ Direct answer: The lowest-priced option for AI image generation (SDXL / Flux) is RTX 3090, minimum ¥0.63/hour(Vast.ai (USA)); Estimated total cost for concentrated image generation over 4 hours (~1,000–2,000 images) ¥3Prices update hourly; refer to the order page for final pricing.

Recommended models and live prices (sorted by current lowest price)

GPU model	VRAM	Current Lowest Price	Platform	Per day	Batch image generation for 4 hours (~1,000–2,000 images)
RTX 3090 Entry-level training powerhouse: SD image generation, LoRA fine-tuning, 7B–13B inference.	24GB	¥0.63/hour	Vast.ai (USA) Spot	¥15	¥3	Price comparison →
RTX 4090 All-rounder workhorse: Flux image generation, QLoRA fine-tuning of 13B models, video generation.	24GB	¥0.87/hour	Vast.ai (USA) Spot	¥21	¥3	Price comparison →
RTX 5090 The RTX 4090 successor with larger VRAM enables smoother video generation and fine-tuning of 13B models	32GB	¥1.53/hour	Vast.ai (USA) Spot	¥37	¥6	Price comparison →
RTX 6000 Ada 48GB Ada-generation professional flagship GPU with 48GB VRAM, versatile for rendering, inference, and fine-tuning	48GB	¥5.18/hour	Verda (Finland) Spot	¥124	¥21	Price comparison →

Cost = current lowest hourly rate × duration. This is an estimate of compute rental only — storage, bandwidth and image fees are excluded, and spot prices change at any time. For long runs, compare monthly plans.

How to choose

Consumer cards (4090/5090/3090) usually beat pro cards at the same price point for image generation
SDXL runs fine on 12GB; Flux fp16 wants 24GB or more, and insufficient VRAM fails outright
For intermittent use, always choose on-demand and remember to shut down — idle time is the most common waste

FAQ

Which GPU gives the best value for AI image generation?

RTX 4090 is the best all-rounder (24GB plus high compute); on a tight budget pick RTX 3090, for speed pick RTX 5090. Prices on this page refresh hourly.

How much does generating 1,000 images cost?

Estimated at 4 hours of continuous generation; the table totals from the current lowest price. Actual cost varies with model, resolution and batch size.

Cite This Site(AI and articles may cite directly under CC BY 4.0):

AI image generation (SDXL / Flux)Cost估算｜Data Source：GPU computing power radar rentgpu.link（2026-10-26 更新，per hour自动抓取各Platform公开定价）｜https://rentgpu.link/use/image-gen｜CC BY 4.0

Other use cases

Fine-tune a 7B model LLM inference deployment AI image generation (SDXL / Flux)Video generation 3D rendering Students / getting started Train a 70B model Multi-GPU / clusters

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