Can the RX 7900 XTX 24 GB run Stable Diffusion 1.5?

Yes. 16-bit fits on the RX 7900 XTX 24 GB with 20.7 GB to spare.

Image model · 0.98B24 GB GDDR6 · 384-bit · 960 GB/s · RDNA 3Data 2026-10-01

Runs well

Yes, with room to spare.

16-bit (2.1 GB) needs about 3.3 GB in use, so 20.7 GB of the 24 GB stays free: room for a larger image, a LoRA or a ControlNet.

Best file16-bit

File size2.1 GB

VRAM needed~3.3 GB

System RAM16 GB+

Memory map · RX 7900 XTX 24 GB3.3 GB / 24 GB

012 GB24 GB

Weights 16-bit · 1.7 GBWorking memory · 0.8 GBReserve · 0.8 GBFree · 20.7 GB

calculated How this is counted.

01What to download

Part	File	Folder	Size
Checkpoint	v1-5-pruned-emaonly-fp16.safetensors 16-bit · Comfy-Org/stable-diffusion-v1-5-archive	models/checkpoints	2.1 GB	Download →
Total download · keep about the same free on disk			2.1 GB

One file: the checkpoint already contains the text encoders and the VAE. Sizes from Hugging Face, 2026-10-01.

02Every SD 1.5 file on 24 GB

File	Size	Needed	On this card	Quality	Download
16-bit ← SAFETENSORS · Comfy-Org	2.1 GB	3.3 GB	fits · 20.7 GB spare	the original weights	Hugging Face →

“Needed” adds 0.8 GB of working memory for SD 1.5 and a 0.8 GB reserve. Sizes 2026-10-01. The 2.13 GB checkpoint also holds the text encoder and VAE; the UNet alone is about 1.7 GB at 16-bit.

03The text encoder

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

04Measured and reported results

Nobody has sent measured numbers for this pair yet. If you run SD 1.5 on a RX 7900 XTX 24 GB, send your time per image and peak VRAM and it will appear here, credited.

05About the RX 7900 XTX 24 GB

ComfyUI supports AMD GPUs on Windows officially since v0.7.0 (January 2026), through ROCm. Memory works the same as on NVIDIA, so the fit verdicts apply. Some custom nodes are NVIDIA-only. RDNA 3 has no FP8 compute, so FP8 files save memory but give no speed-up.

24 GB GDDR6 · 384-bit · 960 GB/s · RDNA 3. Everything that runs on it →

06Questions

How much VRAM does SD 1.5 need?

Around 3.3 GB with the smallest file (16-bit).

Which SD 1.5 file should I download for the RX 7900 XTX 24 GB?

16-bit (2.1 GB) from Comfy-Org/stable-diffusion-v1-5-archive.

How much do I need to download for SD 1.5 on the RX 7900 XTX 24 GB?

2.1 GB: v1-5-pruned-emaonly-fp16.safetensors.