add more pcie slots
1U PCIe x16 1-slot Riser Card F1UL16RISER3
1U 1-slot PCIe riser card option One PCIe* add-in card slot – PCIe* x16, x16 mechanical.
Expansion Slots - E 115: Introduction to Computing ...
While the options for upgrades and add-ons depend on your PC’s motherboard, most consumer desktop devices ship with extra PCIe slots.
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Rose Gold (Tinkers Construct) - Add more modifier slots.