Nvidia Leaker Kopite7kimi mentions that multiple industry sources have confirmed that the next-generation Nvidia flagship (let's call it the RTX 5090) will feature a 512-bit memory interface. If true, this marks the first time since the GTX 280 and GTX 285 days — all the way back in 2008/2009! — that Nvidia has used a 512-bit bus width.
At a maximum throughput of 32 Gbps, a 512-bit bus width would translate into 2 TB/s throughput — double that of the RTX 4090. Considering how even $1,500 cards are nowadays insufficient to run the latest games at full settings and native resolution (looking at you, Remnant II), there may be something to that idea. With 2GB memory chips, a 512-bit interface would also translate to 32GB of VRAM total on such a GPU, or potentially even 64GB and 128GB professional versions with 4GB chips.