Lenovo 4XC0G88841 Thinkserver Upgrade Controller, Host interface PCIe 3.0 x8, Port 12 Gbps SAS, Drive SAS; SATA, Number of drives-8, Level RAID 0; 1; 10; Optional 5; 50 (4XC0G88841), Internal tape drive support. The ThinkServer RAID 520i Adapter is an entry-level 12 Gb SAS/SATA I/O Controller (IOC) that offers a cost-effective internal RAID solution for small to medium business customers.