A couple of official notes from Intel about processor line changes:
The production of 0.18-micron 1.7 GHz mPGA 478 Pentium 4 is cancelled. The last orders for both OEM, and boxes will be accepted on September, 13. This is done for a standard reason no demand for the obsolete model.
The crystal size of 1.80 GHz, 1.70 GHz and 1.60 GHz Mobile Intel Pentium 4 Processor-M will be reduced from 11.93 x 12.24 mm to 11.34 x 11.62 mm. 1.40 GHz and 1.50 GHz Mobile Pentium 4-M will remain the same. Besides, updated CPUs will have S-Spec changed, capacitors relocated without changing their capacity and electrical features in general.
Chips´ functional specifications and CPUID will remain the same. S-Spec of 1.8 GHz Mobile Pentium 4-M is to change from SL65Q to SL6CJ, S-Spec of 1.7 GHz processor from SL5Z7 to SL6CH, S-Spec of 1.6 GHz chip from SL5YU to SL6CG.