Notwithstanding this, legacy systems still employ conventional PCI slots, which are frequently occupied by outdated hardware that does not require the efficiency and speed of contemporawin app downloadry interfaces. The Development of PCI Express (PCIe). PCI Express (PCIe), which has emerged as the de facto standard in modern computing, was created in response to the growing need for faster data transfer rates as technology advanced. The point-to-point design of PCIe, in contrast to its predecessor, enables multiple data transfer lanes, greatly boosting bandwidth.