title: How do I calculate PCIe 1x, 2.0, 3.0, speeds properly?
body: <p>I am honestly very lost with the speeds calculations of PCIe devices.
  I can understand the 33MHz - 66MHz clocks of PCI and PCI-X devices, but PCIe confuses me. </p>
  
  <p>Could anyone explain how to calculate the transfer speeds of PCIe?</p>