It is true in practice. The older style of mining rigs for certain types of cryptocurrency rely on a ton of gpus (6-18) connected via risers to every available

It is true in practice. The older style of mining rigs for certain types of cryptocurrency rely on a ton of gpus (6-18) connected via risers to every available pci-e slot on a motherboard, most of them being 1x slots. There are special motherboards for this that don’t even come with 16x slots, instead breaking that out into 16 1x slots to allow for more gpus to be connected.