HP is not including Intel's Turbo Memory technology in any of its Centrino Pro notebooks.

According to Techspot HP says that that the technology is poor value and limits flexibility. Intel’s Turbo Memory, formerly known as Robson flash memory, uses embedded NAND flash memory to supposedly reduce the time it takes for a computer to power up, to access programs, and to write data to the hard drive.

Acer, Dell and Toshiba will include Turbo Memory. HP says that it is much better to  adding more RAM to the system.

More here.