The best replacement for pcie is pci.

The best alternatives to pcie are rated as following:
★★★★★  pci
★★★  pcix
★★★  agp
★★  pci express
★★  sata
★★  pcie 2.0
★★  pci x
★  msata
★  thunderbolt
★  usb wireless adapter
★  pcie2
★  sata 3
★  thunderbolt 2
  usb wifi
  sata ssd
  pci sound card
  pci slot
  pci-x
  pcie 2
  usb sound card
  usb wireless
  pcie x16
  apg
  pci e
  pci slots
  agp 8x

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