Stable Diffusion 1.5 VRAM requirements

01The files, and how much VRAM each needs

“Needed” = file + 0.8 GB working memory + 0.8 GB system reserve. The 2.13 GB checkpoint also holds the text encoder and VAE; the UNet alone is about 1.7 GB at 16-bit.

02By amount of VRAM

03Best GPU for SD 1.5

The cheapest cards (by launch price) that run it well, and every card sorted by memory: best GPU for SD 1.5 → Planning bigger images or longer clips? Open the calculator →

04By graphics card

On RTX 40/50 GPUs the FP8 file is preferred over Q8_0 when both fit (hardware FP8). All verdicts are calculated; see how the numbers work.

05Text encoder, VAE and other files

The text encoder is inside the checkpoint, so there is nothing extra to download.

06Where the files go in ComfyUI

Standard ComfyUI folders. After copying files, press R in ComfyUI (or restart it) to refresh the lists. Some uploads need their uploader's own loader node — see the notes above.

07AMD, Intel and NVIDIA: which file types are fast

Every file type loads on every listed GPU, so the memory verdicts apply to all of them. What differs is speed: FP8 maths needs RTX 40/50 or RX 9000 (with ROCm 6.4+ and PyTorch 2.7+); ComfyUI's INT8 maths runs on NVIDIA and AMD, not on Intel; GGUF is unpacked on the fly on any GPU, which costs some speed. NVFP4 files are fast only on RTX 50. AMD runs ComfyUI on Windows through ROCm, Intel through PyTorch XPU; some custom nodes are NVIDIA-only. Source: ComfyUI model_management.py. AMD and Intel guide →

08Measured and reported results

No measured results yet. Send yours.

09Training a LoRA for SD 1.5

reported Figures as stated by each trainer's own documentation or official example configs, read 2026-09-25. “Stated minimum” = the docs call it a minimum; “example run” = a config or measured run at that size. They differ a lot because of settings: an 8-bit or 4-bit base model, block swapping and lower resolution all cut memory. All models →

10Every file tracked for SD 1.5

UNet ~0.86B + CLIP-L; native 512px. Only all-in-one checkpoints (Load Checkpoint node); no widely used ComfyUI GGUF of SD1.5 checked (not needed: whole checkpoint is ~2 GB at fp16). Huge fine-tune ecosystem (Civitai).