But as technology advanced & the demand for faster data transfer rates increased, a new standard was created. Once the drawbacks of conventional PCI slots—such as their shared bus lnd slotsarchitecture—were recognized, a more effective solution became necessary. An emerging standard is PCI Express. A major change in the expansion slot industry was brought about by the release of PCI Express (PCIe). Because PCIe uses a point-to-point architecture instead of a shared bus system, it improves performance significantly over conventional PCI slots.