In addition, PCIe has experienced multiple revisions since its inception, each of which has improved speed & functionality. PCIe 1.0big bass bonanza slots, the original version, had a maximum bandwidth of 2.5 GT/s (gigatransfers per second) per lane, or about 250 MB/s in each direction. This bandwidth has gradually been increased by later versions, such as PCIe 2.0, 3.0, and the most recent 4.0 and 5.0 standards.