Investigating Intel's Turbo Memory: Does it really work?
 

The one unique feature that Santa Rosa offered that no other competing mobile platform, Intel or not, could bring to the table was a technology called Turbo Memory. An on-motherboard flash card, Intel's Turbo Memory is designed to act as another layer in the memory hierarchy, caching data where possible and improving performance/battery life in notebooks. A version of Turbo Memory will also be released for the desktop, but we're most interested in what it can do for notebooks.

http://www.anandtech.com/mobile/showdoc.aspx?i=3009