About this item 8 internal ports, low-profile MD2 form factor 1.2 GHz dual core RAID on Chip (ROC) High-performance RAID 5 and 6 Up to 512 MB DDR2 cache Supports Up To 256 SATA Or SAS Drives Using SAS Expanders 3 Gb/S Throughput At Each Drive Port x8 PCI Express host interface Supports Multiple Raid Lunes