I've already purchased a OCZ Vertex 3 120gb SSD...Basically I'm wondering if I can use the SSD as the main drive (OS + vital apps), but dedicate say 20-30gb of the SSD to caching for the HDD, or if the HDD HAS to be the main drive to take advantage of the caching from a Z68 board.
Anybody have any insight on this? Thanks in advance!
Yes it can be done, but it's nothing I would do or recommend. Reason, SSD Caching only accelerates 'Frequently Used' data aka (repeat use) so if it's going to be 'Frequently Used' then just have it on the SSD and leave the additional space on the already >small< SSD. Further, partitioning you'll lose a few GB of storage capacity which also adds to my 'Don't do it' advice.
SSD Caching financially makes little sense and 120GB is about as small a SSD as I recommend anyway and in (1) piece.