The memory slots (I think) are how many sticks of RAM the motherboardd will take. So, in this case, two sticks. (I'm not entirely sure though)
PCI and the rest of those slots are for graphics cards, wireless cards, network cards and soundcards etc.
Most grahpics cards are PCIe (express) x16. You should post a picture of the motherboard (if you can) , because quite often a slot or two can't actually fit anything in it, as there are componants around it.
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