IBM System x3500 M4 Product Manual page 14

The ServeRAID M1115 SAS/SATA Controller has the following specifications:
Eight internal 6 Gbps SAS/SATA ports
Two x4 mini-SAS internal connectors (SFF-8087)
Supports RAID levels 0, 1, and 10
Supports RAID levels 5 and 50 with optional M1100 Series RAID 5 upgrades
6 Gbps throughput per port
PCIe x8 Gen 3 host interface
Based on the LSI SAS2008 6 Gbps ROC controller
The ServeRAID M5110 SAS/SATA Controller has the following specifications:
Eight internal 6 Gbps SAS/SATA ports
Two x4 mini-SAS internal connectors (SFF-8087)
Supports RAID levels 0, 1, and 10
Supports RAID levels 5 and 50 with optional M5100 Series RAID 5 upgrades
Supports RAID 6 and 60 with the optional M5100 Series RAID 6 Upgrade
Supports 512 MB battery-backed cache or 512 MB or 1 TB flash-backed cache
6 Gbps throughput per port
PCIe x8 Gen 3 host interface
Based on the LSI SAS2208 6 Gbps ROC controller
IBM System x3500 M4 14