Train a FLUX.3 Image Klein LoRA on 24 GB VRAM

Can you train a FLUX.3 Image Klein LoRA on a 24 GB GPU? Here is the short version.

Short answer: Yes. SimpleTuner ships 24 GB recipes for FLUX.3 Klein: Base at 512px (batch 3) and distilled klein at 768px (batch 1).

Exact VRAM data we have

SimpleTuner recipes: Base from 24 GB (512px, batch 3) up to 144 GB; distilled klein at 24 GB (768px, batch 1) or 80 GB (1024px, batch 4)

Memory-relevant settings

diffusers v0.42.0 (Oct 23) supports FLUX.3 Image Klein Base and distilled through ModularPipeline only (ModularPipeline.from_pretrained, then load_components), with the prompt upsampler and BFL FP8 and NVFP4 checkpoints. Needs Python 3.11+
Train and generate at 1.5k resolution or higher rather than 1k; the VAE holds it back at 1k

Trainers that support FLUX.3 Image Klein

ai-toolkit: supported (day-0, PR #1078 merged Oct 15; fixes Oct 15)
SimpleTuner: supported (Base + distilled klein recipes, 24-144 GB)

Other tiers: FLUX.3 Image Klein overview

Where to rent a 24 GB+ GPU

Cheapest 24 GB+ cards (2026-10-20 08:06 UTC) from RunPod and Vast.ai. Prices move constantly; see the live price table.

GPU	VRAM	RunPod community $/hr	Vast.ai cheapest $/hr
RTX 3090	24 GB	$0.22	$0.12
Tesla V100S	32 GB	—	$0.14
RTX A5000	24 GB	$0.16	—
RTX PRO 4000	24 GB	$0.50	$0.26
RTX 3090 Ti	24 GB	$0.27	—
RTX A6000	48 GB	$0.33	$0.40

Sources

FAQ

Is 24 GB enough to train a FLUX.3 Image Klein LoRA?

Yes. SimpleTuner ships 24 GB recipes for FLUX.3 Klein: Base at 512px (batch 3) and distilled klein at 768px (batch 1).

What is the cheapest 24 GB+ GPU to rent?

See the table above and the live price page.

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Data updated 2026-10-20. Disclosure: RunPod and Vast.ai links are referral links; ImageLoRA may earn a commission at no cost to you. unknown = no data yet. · Raw data (JSON) · llms.txt