Hi, Intel CPUs are multiplier locked, so it shouldn't matter what multipliers your bios supports.
You can run P4s with 400MHz bus speed (PC800 Ram fast timings) and 533MHz bus speed (PC800 Ram slow timings), so it should be no problem to run this processor. Only 800Mhz CPUs do not work.
Please correct me someone, if i am wrong. It's a while since I owned a TH7II.