This isn't possible currently unless you use HBM, which is significantly more expensive both to actually buy the HBM, and to package it (and all the capacity fo

This isn't possible currently unless you use HBM, which is significantly more expensive both to actually buy the HBM, and to package it (and all the capacity for packaging HBM interposers is already used for data center hardware). The most VRAM you could have on a consumer GPU today is 48GB, and that'd be on a 4090 or 7900xtx with clamshell VRAM (which increases cost and makes cooling significantly harder due to putting GDDR6 chips on the back of the GPU where there aren't any fans). To calculate how much VRAM is possible, you just need to divide the GPU's bus width by 32 (or 64 for Samsung's new weird double capacity but double bit width) and multiply that by the largest GDDR capacity currently available (16Gbit). As for why GPUs don't increase their bus width, there have been GPUs with 512bit busses in the past, but it makes it quite a bit more expensive (more vram chips, more traces to run, might require more/heavier PCB layers) and increases power draw.