fcar1999ta :
I have seen data the seems to show that two SATA3 SSDs in RAID 0 read/write at speeds in the range of 9-10Gbps. One SATA3 drive runs 6Gbps, and 12 SATA3 drives in a non RAID will run at 6Gbps.
This data suggests that four SATA3 SSDs (SATAIII or mSATA) would RAID 0 at close to 20Gbps.
20Gbps vs 6Gbps.........................................
I'll give this one last try.
Gbps and MB/s is what you should use to measure if you have a fixed amount of computer time, and need to try to get as much data as possible read in that time. For example, you have 50 seconds before the computer blows up, and you need to transfer its drive data to a flash drive ASAP. That's the type of situation where you should think about drive speeds in terms of Gbps or MB/s. This type of situation is almost never relevant. Reviewers and drive manufacturers just like measuring things this way because it results in very big numbers for very small improvements in performance.
sec/GB is what you should use to measure if you have a fixed amount of data to read, and you want to know how much time it'll take to read it. Almost everything you do with a computer is this type of situation. To boot Windows or start a game, the computer needs to read a fixed amount of data off the drive. And what you care about is how much time it takes to do that.
(HDD) 100 MB/s = 10 sec/GB
(SATA 1) 150 MB/s = 6.67 sec/GB
(SATA 2) 300 MB/s = 3.33 sec/GB
(SATA 3) 600 MB/s = 1.67 sec/GB
(2x RAID 0) 1 GB/s = 1 sec/GB
(4x RAID 0) 2 GB/s = 0.5 sec/GB
The max speedup you'll see going from 600 MB/s to 2 GB/s is 1.17 sec per GB. That's less than the 1.67 sec per GB speedup you got going from SATA 2 to SATA 3. And less than 1/8th the speedup from a HDD to a SATA 3 SSD. You're basically going through all this trouble so you can reduce your wait times by
at most an extra 12% over the reduction you got switching from a HDD to a SSD.