Not sure if I caught a question in there or not, but you don't need anything new. SAS connectors/controllers will also take SATA.
Hi, I bought a T310 as a home server. Dell PowerEdge T310 QC Xeon X3440 2,53GHz 8GB PercRaid 4LFF The 4 Front Caddys are SAS/SAS Backplane I want to use 4x Sata (2x SSD Raid1 and 2x HDD Raid1).   Now I have to buy a) 4x SATA to SAS Adapter or b) a new Backplane (SATA)  Thanks a lot!
Which SATA Adapter for T310 SAS Backplane