No, the adapter you speak of is for enabling HT on the motherboard, not the CPU. Say you had an older 845 or 645 chipset board with no HT, and a P4 3.06 (the only "B" processor with HT). You could use this adapter (on some boards) to allow the 3.06's HT to work on that board.
<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>