StyleGAN of this size runs fine on your average CPU. I know that for a fact since I wrote paint.net plugin that does exactly that. Said plugin works perfectly

StyleGAN of this size runs fine on your average CPU. I know that for a fact since I wrote paint.net plugin that does exactly that. Said plugin works perfectly fine with images of the size they use (512x512) and generates output (CPU-only, mind you) in less than 5 seconds on a dual-core laptop...