Hardware

More memory bandwidth does not translate 1:1 to more performance. The GPU core is by far the most important. Even at 4K the current 1TB/s memory bandwidth is sufficient and overclocking the core is what gets you the most performance.

We've also seen that the 128-bit 4060Ti 16GB with its pitiful bandwidth can utilize its full 16GB VRAM without any issues at 1440P.

So if you're trying to estimate performance gains, the core is where you should look for now, especially if Blackwell keeps the increased L2 cache (Ampere's cache was measured in kilobytes, it was a radical change and it definitely worked well for AMD with RDNA2 too). Unless you're doing 8K gaming the extra memory bandwidth will have minimal impact.