You do need to have a free pcie expansion slot on your motherboard so that you can plug in a pcie splitter, aka riser, which then fans out to multiple external pcie slots. How many pci e cables do i need to power 3080ti i recently got a msi 3080ti trio from the shuffle but i'm confused what i need to power it. Money Isn't Everything a millionaire, How to But, pcie slots are limited depending on the motherboard model. How many pcie slots do i need for gaming . So that means there's really 2 usable pci slots. Most boards with multiple x16 length slots cannot provide x16 bandwidth to both slots due to chipset/cpu limitations. You might think it would be different if you look at the number of available mainboards, e.g. Whether you want to add a graphics card for gaming, a wifi network card, or a dedicated sound card, you use the pcie slots. I'm super bummed because someone in my family threw away my psu box with the extra cables. It is also worth noting that...