The Adaptec series 7 RAID adapter family features PMC's 24 port PM8015 RAID-on-Chip (ROC), which combines a x8 PCIe Gen3 interface with 6 Gb/s SAS ports to enable a new generation of high performance RAID adapters that are unmatched by any other ROC in the industry. Adaptec series 7 RAID adapters are available with 8 native SAS ports. While the PCIe Gen3 interface doubles bandwidth to the host compared to PCIe Gen2, it requires at least 16 6 Gb/s SAS ports to double the bandwidth to the storage devices.