Water cooler - GPU upgrade

I picked up a Lynx system earlier this year and I've been very happy with it. I opted for the cheapest GPU at the time (a GeForce GTX 1650 4GB). Now that prices have settled down a bit I'm considering upgrading, mostly so that I can play around with Stable Diffusion. With any luck, the 30xx series will drop a bit in price over the coming months as the first few 40xx models released. I have two questions regarding upgrading.

First, I got the Vortex liquid cooler. Am I correct in thinking that that's CPU-only, and is not hooked up to the GPU? If so then swapping graphics cards should be straightforward.

Second, I got a 600W PSU, and the original order says "Supports up to an NVIDIA RTX 3060 Ti GPU". If I were to pick up a 3070 Ti, would I really have issues with a 600W power supply? Do I need to upgrade that at the same time? I've found contradictory information about just how power-hungry the 3070s are.

My current setup has dual-screen monitors, each at 1980x1200. In terms of gaming I am not playing any of the particularly demanding games -- I've been playing Wildermyth the past couple weeks, which is nobody's idea of a graphically demanding game. When I first got this system I did three complete playthroughs of Horizon Zero Dawn in three months, and was perfectly happy with the quality of the graphics from that GTX.

The main point in considering an upgrade at all was that I'd really like to play around with image generation AI using Stable Diffusion. But the specs for that make it clear you need a recent nVidia GPU with at least six GB of RAM in order to get it to run, and the GTX only has 4 GB.

Still, on further investigation it looks like the 3060 Ti and the 3070 Ti actually both have the same amount of RAM (8 GB) and use the same memory clock, so I think I'll take the advice to get a 3060 Ti. That'll save me the trouble of swapping PSUs and do everything that I want. Also, it's cheaper.

Thanks for the help, everyone!

Edited by wdmartin - 13 Oct 2022 at 9:14am