I am using a Samsung SSD 830 Series disk (latest firmware) which is connected to the first SATA II port on my computer (Fujitsu Celsius M460). The ports two to four are each connected to a 1TB SATA disks which are configured as a RAID 5 device using fake-raid. (Intel ICH9R)
Samsung Magician (running latest version 4.0) says: AHCI mode is deactivated and required for highest SSD performance. Checking the BIOS settings it seems to be enabled, also the option is grayed out (due to the fact that RAID is enabled)
Also the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\msahci\Start is set to "0".
So what can I do to fully leverage the SSD performance? Can fake-RAID and AHCI mode be used at the same time?
Typicall when you use onboard raid all the ports of that type on the controller chip will be placed in raid mode. For example my motherbd has 4 sata3 ports and 4 sata2 ports. when I enable raid for sata 3 it puts all the sata3 ports into raid mode alnd leaves sata2 in whatever mode I had them. Your drive shoud still work fine as a single drive on the raid controller.
Please note that you will not see the SSD's full speed simply because your M460 does not have sata3 ports, only sata2.