It's probably the typical bullshit and everyone is talking out of their ass. The delta between the 4070ti super and 4080 will be big in my opinion. And from what I've read the 4080 super will MAX 5% better than a regular 4080 IF THAT (no where near 15%). And that is coming from nvidia..No one knows until it comes out. It's just typical trash talking. It will be LOW SINGLE DIGIT FPS GAINS over the 4080. If you are selling your 4080 to get a 4080 super....you're an idiot.
Performance
Given the specs of the RTX 4080 Super, it’s hard to imagine it will be much faster than the base RTX 4080. The bump in core count and clock speed will help it hold an edge, but I suspect that edge will be in the lower single digits in most games.
How does that relate to the RTX 4080 Super? Well, we can see from the specs that there probably won’t be a huge jump over the RTX 4080. Given that, the performance improvements will likely be small, and in some games, there may not be performance improvements at all. Nvidia tells me it expects performance improvements of up to 5% overall, with most games landing around a 3% jump.
That might be the best play. It doesn’t appear like the RTX 4080 Super will provide a big advantage over the base RTX 4080, so if you can score a deal on Nvidia’s older card, that’s the way to go.