The world’s biggest super computer, Frontier, has 9,2 PB of RAM. It’s not available to one CPU, so no need to address everything in one address space, but let’s say it is. That still leaves room to build around 1 000 times more RAM into that theoretical CPU. I’m not sure we would be able to build such a computer today. One that needs more than ~10 000 PB RAM to address, which is what 128 bits means.

Sure, RAM isn’t the only reason for bigger address space, but there are also other ways to handle data beyond one address space. For the consumer, we are far from there.

Threadripper 7000 motherboards soon available.