My current configuration is a RAID-0 with three conventional 2TB hard drives. I want to upgrade to three 1TB SSD EVO disks, also in a RAID-0 configuration.
Using SiSoftware Sandra, I found out that my T7500 Dell Precision uses SATA II (3Gb/s) in its preinstalled Dell 6 port SATA AHCI Controller, combined with a Dell SAS 6/iR Integrated Workstations RAID Controller (internally it's an LSI Logic SAS 3000 series).
I have trouble understanding the requirements for the RAID controller part that I need to upgrade. According to this report, which uses a RAID-0 with two 500GB EVO disks, I need to be able to throughput more than 1000 MB/s, or approx. 8 Gb/s, for sequential I/O.
My gut feeling says that the SATA limitation is the limit between RAID and disk, not the limit between mainboard and RAID. But my RAID supports SATA II, EVO supports SATA III. Should I upgrade my RAID controller? And if so, what properties should I query for?
Update: I have to admit (update after reading the first answer) that I am not certain whether the SAS controller is on board and whether I should look for a RAID controller with an internal SAS controller, or whether that would conflict.