The IO Crest Dual M.2 B-Key PCI-e 3.0 x1 Controller Card is the easiest way to update any computer with two M.2 B-key SSD to a free PCI-e x1 or larger slot. This allows support of two M.2 SATA base SSD at speeds of up to 6Gb/s. Comes with Advanced Aluminum alloy shell make heat-dissipation more Efficiently. The heat-dissipation function is maximized to facilitate heat dissipation of the hard disk during operation, and can fully utilize the powerful performance of the hard disk. Using the JMB582 chipset, the SI-PEX40153 can provide a maximum sequential Read / Write Speed of 850 MB/s to 2 SATA 6Gb/s ports. For the storage solution based on data transfer of multiple hard drives, the newly added FIS-based switching design can overcome the bottlenecks created by operating multiple SATA storage devices simultaneously.