aged well 3070ti is low perf card for 4k and 16GB would help none, other to post at forum you have 16G on it
That's still RX 7700 level of performance, not bad but also not particularly good.
If anyone thinks 16GB is useless, they can buy a 5060Ti with 8GB Vram, I would rather pay extra $50 for the 16GB version.
I won't talk about 12GB, because there is no such option at <$500.
P.S. There are still cases where even at 1440p without RT 16GB actually helps.
RTX 4060TI 16GB scores +19.7% average FPS and +25.4% minimum FPS.
If you enable RT then It helps even at 1080p and at playable FPS!
RTX 4060TI 16GB scores +23.1% average FPS and +16.5% minimum FPS.
P.S.2 RX 7600XT 16GB vs 8GB shows a huge 38% increase even at 1080p without RT both average and minimum!
edit: It's very likely the same results would happen even with 12GB, at least at playable resolutions.
Nvidia could later introduce a 24Gbit model, but then they would have to discontinue the 16GB version unless 5060Ti 8GB will be a cutdown version.