64GB is overkill for Stable Diffusion — but not for everything.

Probably not. For most Stable Diffusion users, 32GB is plenty. The bottleneck is usually the GPU, not system RAM.

Stable Diffusion runs mostly on VRAM. If your GPU has enough (8GB+), system RAM barely matters. 32GB already leaves headroom for multitasking. Going to 64GB won’t make images generate faster.

Where 64GB helps is if you’re training or fine-tuning larger models — think Llama 3 70B or something that doesn’t fit entirely in VRAM. Then the extra system RAM lets you hold more of the model in memory instead of swapping to disk. That’s a real speed boost.

But for diffusion models? Your GPU is the choke point. More RAM just sits there looking expensive. Save the money for a better GPU or more VRAM.

Future you wants a 4090, not an extra DIMM.