The Samsung Magician manual TRIM feature does not work with SSDs in RAID unfortunately, that would be a great feature, but it's just not available.
Windows 8 has a new manual TRIM "Optimize" feature that can be run on RAID 0 arrays. I can't verify that it works correctly on AMD systems, since I don't have any.
All AMD and Intel RAID implementations use a RAID driver, a basic one for each is included with Windows 7, but who knows what version it it. Those drivers are required for RAID to function. You can install the full RAID driver package provided by AMD and Intel after Windows is installed. Intel's includes a Windows UI that allows you to maintain and configure RAID arrays, not sure about AMDs.
Low IOPs with the AMD RAID setup could be caused by a few things. The AMD SATA III interface does not perform at the same level that Intel's does. CPU power saving options, when enabled will cause lower performance scores in benchmark programs. If the RAID volume is also the OS drive, that can cause lower benchmark scores, since it is doing the OS work at the same time as having the benchmark run on it.
Don't forget that ALL performance specs for ANY SSD include the magic words, "Up To", meaning the specs are a maximum, not a guaranteed spec. IOPs are dependent on the speed of the SATA interface in most cases, more IOPs (I/O Operations per Second) can be accomplished on a faster interface, if the drive is capable of performing more IOPs.
I have had bad experiences using the Samsung cloning software, the result has always been a partially functional "new" OS installation on the Samsung SSD. It will boot into Windows, but some programs refuse to run or fail immediately. That was just cloning from one SSD to one Samsung SSD, some cloning software will not clone to a RAID array. I tried it several times, always the same result. I used a different cloning program which worked perfectly with the same SSDs and PC.
TwoCables, so you are an advocate of the Magician software now? I like it too, although it is not perfect (few things are.) You know some people don't like it and consider it bloatware, but IMO if you can't spare several MBs of storage for it, you have other problems. It does install as a Window auto-run, needlessly IMO, and on some PCs (like mine) will not allow Windows Sleep to work correctly, the PC wakes within seconds of entering Sleep. If you start a thread about it, be prepared to be ripped by the naysayers.