All Prescott-based Pentium 4's and Celeron D processors for the desktop market, Petium M's and Celeron M's for notebooks and the whole Xeon line for servers and workstations will feature this new technology. But initially only LGA775-pin processor with E-0 stepping will receive support for NX Bit. Intel will add the letter "J" behind processors using the NX Bit technology.
The sources noted that the Desktop Pentium 4, Celeron D and Nocona-based Xeon processors with the additional security will be available in the third quarter of this year, while Pentium M and Celeron M chips with NX Bit-support are expected in the first quarter of 2005.Some more info regarding prices of Intel CPUs can be found at DigiTimes