With Yorkfield, Intel differentiates the Core 2 Extreme and Core 2 Duo models by the front-side bus speed. Intel Core 2 Extreme Yorkfield processors will have a 1333 MHz front-side bus, continuing on where the Kentsfield Core 2 Extreme QX6850 leaves off. The quad-core processor supports Intel VT, Enhanced Intel SpeedStep and Intel 64 and Execute Disable Bit technologies. Intel leaves TXT technology out of the 45nm Core 2 Extreme however.