It will handle SAS, NL-SAS or SATA drives.  Regards,  
I have a Dell R510 Server with 4x HDD SATA Cabled, I Want to upgrade my Server to 8x HDD SAS and buy new HDD 3TB SAS and the 8x SAS Backplane with PERC H700/1GB Flash. I want to know if my idea of upgrade my Server is supported. Thanks, Sergio R.
DELL R510 11G 4 HDD CABLED UPGRADE TO 8 HDD SAS