The Crucial BX300 is available in capacities of 120GB, 240GB and 480GB - we've been supplied with the 480GB for testing. Typically, the SATA interface, regardless of the relatively poor performance when compared to PCI-E solutions, is more than enough for a typical user, offering up to 550MB/s transfer speeds; PCI-E SSDs are also more expensive, which adds to the appeal of a SATA SSD.