Can somebody explain what a 2 slot and 3 slot GPUs means?

Vertical GPU: up to 4 slots; horizontal GPU: 3 slots drive mounts Vertical GPU: 3 x ” SSD; horizontal SFF GPU: 6 x ” SSD drive mounts

For instance, we have a Micro ATX motherboard with two PCIe x16 slots, but one is a true PCIe x16 slot while the other is actually a PCIe

20 super stars slot Vertical GPU: up to 4 slots; horizontal GPU: 3 slots drive mounts Vertical GPU: 3 x ” SSD; horizontal SFF GPU: 6 x ” SSD drive mounts

2 slot Even though the dual is a 2 slot bracket it takes up 3 slots If all the op is talking about is a 2 slot bracket there are a bunch