The Z97 allows SRT. If you want to use it, the SATA controller must be set to RAID in the BIOS/UEFI. If you have already installed Win, this will make it unable to boot (yes, even 8.1). By changing a registry value prior to switching to RAID you can get around this problem. It's pretty much the same as changing an installed Win between AHCI and IDE mode, which triggers the same boot failure. Google finds instructions for this
Afterwards you must have some unpartitioned space on the SSD to active SRT in the "Intel Rapid Storage Technology". I have not yet tried this, as I'm always using the full 60 GB of my SSD as cache, but I remember seeing the option to leave some space on the SSD unallocated. There is a risk that the software insists on wiping the SSD of all partitions when you set up SRT without using the full space for it. Just be careful here, I really don't know if this works or not. Well, you could try it with some of your current HDDs before deciding on how fast your new one needs to be.