7b can run fine on consumer hardware if you quantize to 4bit. I get around 50-100 token/s on 7b q4 models on older 8gb gpus I have lying around, which is plenty for chat. I don't know of any good resource for "consumer hardware leaderboard" though. In general:

1.3b is about the max you can get for 4gb vram

7b will work on 8gb vram if you quantize

13b will work on 16gb vram if you quantize

33b can work on 24gb if you quanitze

If you lack vram but have ram and infinite patience you can do offloading shenanigans with cpu but it tanks performance to unusable levels in my experience.