It means that there is no front side bus. AMD 64 processors use an integrated memory controller, so the information travels at speeds the Processor is running at (GHZ) instead of speeds regular front side busses run at (MHZ). A 2.2 GHZ AMD 64 processor will have a "theoretical" FSB of 2.2 GHZ, while the new Pentium Processors have a FSB of 1 GHZ.
6600GT PCI-E for sale/Trade. Check the FS/FT forums on tech-forums for details.