SATA card for PCIe x1 slot with 8 ports

Product Overview · This PCIe x1 to PCIe x16 Slot Extension adapter provides enhanced compatibility between motherboards and a variety of PCI-Express expansion

Yes, a x1 card should work in a x16 slot It's good that you've got it to work in a x1 slot What else have you tried it in besides the x16 slot

x1 pcie slot It's a Dell Optiplex 755 Mini Tower The PCIe slot on my PC should be a PCIe slot from what I could find

x16 slot A PCIe x1 slot is a type of expansion slot on a computer's motherboard that provides one lane of PCIe connectivity It is designed to support low-bandwidth