here's a link to the article -
Intel Z68 Express Chipset Preview: SSD Caching And Quick Sync : Z68 Express Makes Its Debut
Interesting bit about SSD Caching (copied and paste) from the same article.
SSD caching, Intel-style, is constrained by a handful of requirements.
1. You have to be using a Core i3, Core i5, or Core i7 processor. As far as we know, caching will only be enabled on Z68 Express, so this narrows the list even further to Sandy Bridge-based LGA 1155 CPUs.
2. You need to have the 32- or 64-bit version of Windows Vista, 7, or Server 2008 installed.
3. Intel’s Desktop/Workstation/Server Express Chipset SATA RAID controller hub has to be installed and enabled (the platform controller hub needs to be in RAID mode, in other words).
4. The system has to be RAID-ready with the Accelerate bit enabled (presumably, Z68 will be the only platform with this switched on initially).
5. You need a SATA-based SSD with at least 18.6 GB of free space.
6. You need a hard drive present with no recovery volume.