what do you do when not enought pci slots or slots are covered?

then you cant use it.
or switch it out with another pci card that you can do without.
perhaps a wifi card can be interchanged with a usb one?
 
Believe it or not some peripherals still use the old pci bus. And some users might even have old vga cards that use pci slots... can't imagine anyone still using that though. It's mostly used for extension cards and such...
 
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