http://www.theinquirer.net/?article=4419
IT HAD TO HAPPEN AND IT HAS. According to Japanese site Akiba PC Hotline, firms will start shipping a convertor in the next few days which lets you convert a 423-pin Pentium 4 to a 478-pin model.
....
Just using the adaptor is not enough to go plug in a Northwood Pentium 4 however you have to make sure the motherboard, chipset and BIOS will be as easily persuaded as the base of the chip.

IT HAD TO HAPPEN AND IT HAS. According to Japanese site Akiba PC Hotline, firms will start shipping a convertor in the next few days which lets you convert a 423-pin Pentium 4 to a 478-pin model.
....
Just using the adaptor is not enough to go plug in a Northwood Pentium 4 however you have to make sure the motherboard, chipset and BIOS will be as easily persuaded as the base of the chip.
