I know this answer is a bit late.
The Asus P2B is a bit of a special case. It's one of few really early Socket 440 BX motherboards that can have support for the 133/4 PCI-divider.
As always It depends on the clock generator. The pre-release boards can have the correct divider but the 133 MHz FSB setting isn't silk screened if it exists. The first retail revision (1.02) has it but the 133 MHz FSB setting isnt always silk screened. Revision 1.03 and 1.04 if they exist probably have it.
With revision 1.05 (if I remember correctly) Asus changed the clock generator to one that diddnt support the /4 PCI divider at 133 MHz but they still silk screened the 133 MHz FSB setting.
Later (dont remember the exact revision) Asus changed the clock generator again to one with 16 settings with one beeing the 133(33) one but they kept the jumper block with 3 FSB jumpers and the 133 MHz setting you could access was of course the 133(44) MHz one. With even later revisions they fixed this by adding a forth jumper in the FSB jumper block.
Boards earlier than revision ~1.12 rarely have VRMs with support for voltages below 1.8v, use a slotket with VID selection jumpers and jumper it for 1.8v. You can even run a 1.4 GHz Tualatin-S this way as the P2B has pretty bad vdrop+vdroop so the actual voltage at 1.8V is ~1.7v during load (at least with my board). I dont take any responsability for Tualatin experiments though as the VRM circuit isnt designed to handle the resulting current (use active cooling on the VRM components and be prepared to replace VRM mosfets and perhaps even the CPU should the magic smoke escape).
All above is only true for vanilla P2B motherboards. Later models like the P2B-F probably do everything right regardless of revision.
It's years ago I tested and researched this and I cant find any notes or the thread I thought I posted here on Vogons so everythng written above is from memory alone and my memory isn't perfect.
New PC: i9 12900K @5GHz all cores @1.2v. MSI PRO Z690-A. 32GB DDR4 3600 CL14. 3070Ti.
Old PC: Dual Xeon X5690@4.6GHz, EVGA SR-2, 48GB DDR3R@2000MHz, Intel X25-M. GTX 980ti.
Older PC: K6-3+ 400@600MHz, PC-Chips M577, 256MB SDRAM, AWE64, Voodoo Banshee.