I went the 4090 route myself recently, and I feel like all should be warned - memory is a major bottleneck. For a lot of tasks, folks may get more mileage out of multiple 3090s if they can get them set up to run parallel.

Still waiting on being able to afford the next 4090 + egpu case et al. There are a lot of things this rig struggles with running OOM, even on inference with some of the more recent SD models.