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

Stable Diffusion, Flux, ComfyUI Image Generation: Which GPU Delivers Fastest Output and Lowest Cost Per Image? · Data Updated: 2026-10-31

⚡ 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 auto-update every 45 minutes; final pricing reflects the checkout page.

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	¥5.33/hour	RunPod (USA) Spot	¥128	¥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 offers the best overall value (24GB VRAM + high compute); choose RTX 3090 for tight budgets; opt for RTX 5090 when speed is critical. Prices on this page update every 45 minutes.

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 Compute Radar rentgpu.link（2026-10-31 更新，Every 45 minutesAutomated crawling各Platform公开Pricing）｜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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