I have not noticed any difference between the RAID and ATA mode in the BIOS on the performance of the SSD.
Samsung provides one RAPID mode and that takes up a lot of RAM. So, after the OS just boots up, around 3 GB of RAM is already used. I have just 6 GB.
BTW: What type of SATAcable are you guys using? Is it right angled on one side or both?
Is it SATA 3 Gbps or 6 Gbps cable?
Currently I have disconnected my BlueRay Drive and connected the SATA cable to the SSD.