Lenovo TDSourcing ServeRAID B5015 SSD Controller - Storage controller (RAID) - SATA 3Gb/s / SAS 6Gb/s low profile - 6 Gbit/s - RAID 1/ 5 - PCIe 2.0 x8 - refurbished - for Lenovo System x3550 M2/ x3550 M3/ x3650 M2/ x3650 M3/ x3850 X5/ x3950 X5