I thought the Intel caching solution only worked if you didn't use AHCI.
If your existing setup was
1. SSD for windows
2. HD for apps etc
and you added a msata cache drive, would you need to switch of AHCI, and could you exclude the SSD from the msata caching?
You have to set it to RAID in the BIOS for Z68 caching but any single drives (e.g. the OS SSD) are treated as AHCI anyway with this setting (with TRIM); so you don't lose out on anything.